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+ NestJS 中 enableImplicitConversion 与 @Transform 的冲突
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+ Aug 13, 2025
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+ <p>在 NestJS 生态中,<code>class-validator</code> 和 <code>class-transformer</code> 这两个库提供了以声明式的方式对 DTO 进行验证和转换。然而在处理布尔值时,如果在全局验证管道或仅仅是在局部同时开启了 <code>enableImplicitConversion</code>,可能会引入一个极其隐蔽且违反直觉的 Bug:前端传过来的布尔值恒为 true。</p>
+<h2 id="一个简单的筛选功能"><a href="#一个简单的筛选功能" class="headerlink" title="一个简单的筛选功能"></a>一个简单的筛选功能</h2><p>假设正在开发一个电子商务平台的 API,需要实现一个产品列表的筛选功能。希望能够根据产品是否有库存 (<code>hasStock</code>)、是否为特色产品 (<code>isFeatured</code>) 等布尔条件进行筛选。</p>
+<p>前端发出的请求 URL 可能如下所示: <code>/products?filter[hasStock]=true&amp;filter[isFeatured]=false</code></p>
+<p>在 NestJS 后端,首先会在 <code>main.ts</code> 中配置一个全局的 <code>ValidationPipe</code>,以自动处理 DTO 的验证和转换。为了方便,通常会启用 <code>enableImplicitConversion</code>,期望它能自动将 URL 查询参数中的字符串(如 <code>&quot;123&quot;</code>, <code>&quot;true&quot;</code>)转换为 DTO 中定义的类型(<code>number</code>, <code>boolean</code>):</p>
+<figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// main.ts</span></span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">ValidationPipe</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;@nestjs/common&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">NestFactory</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;@nestjs/core&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">AppModule</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;./app.module&#x27;</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">async</span> <span class="keyword">function</span> <span class="title function_">bootstrap</span>(<span class="params"></span>) &#123;</span><br><span class="line"> <span class="keyword">const</span> app = <span class="keyword">await</span> <span class="title class_">NestFactory</span>.<span class="title function_">create</span>(<span class="title class_">AppModule</span>);</span><br><span class="line"></span><br><span class="line"> app.<span class="title function_">useGlobalPipes</span>(</span><br><span class="line"> <span class="keyword">new</span> <span class="title class_">ValidationPipe</span>(&#123;</span><br><span class="line"> <span class="attr">transform</span>: <span class="literal">true</span>, <span class="comment">// 启用转换</span></span><br><span class="line"> <span class="attr">whitelist</span>: <span class="literal">true</span>,</span><br><span class="line"> <span class="attr">forbidNonWhitelisted</span>: <span class="literal">true</span>,</span><br><span class="line"> <span class="attr">transformOptions</span>: &#123;</span><br><span class="line"> <span class="comment">// 启用基于 TypeScript 类型的隐式转换</span></span><br><span class="line"> <span class="attr">enableImplicitConversion</span>: <span class="literal">true</span>, </span><br><span class="line"> &#125;,</span><br><span class="line"> &#125;),</span><br><span class="line"> );</span><br><span class="line"> </span><br><span class="line"> <span class="comment">// ... 其他配置</span></span><br><span class="line"> <span class="keyword">await</span> app.<span class="title function_">listen</span>(<span class="number">3000</span>);</span><br><span class="line">&#125;</span><br><span class="line"><span class="title function_">bootstrap</span>();</span><br></pre></td></tr></table></figure>
+
+<p>接着,定义一个 <code>ProductFilterDto</code> 来接收这些筛选条件。</p>
+<p><strong>一个看似正确的 DTO 定义:</strong></p>
+<figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// product-filter.dto.ts</span></span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">IsBoolean</span>, <span class="title class_">IsOptional</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;class-validator&#x27;</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">class</span> <span class="title class_">ProductFilterDto</span> &#123;</span><br><span class="line"> <span class="meta">@IsOptional</span>()</span><br><span class="line"> <span class="meta">@IsBoolean</span>()</span><br><span class="line"> <span class="attr">hasStock</span>?: <span class="built_in">boolean</span>;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@IsOptional</span>()</span><br><span class="line"> <span class="meta">@IsBoolean</span>()</span><br><span class="line"> <span class="attr">isFeatured</span>?: <span class="built_in">boolean</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+
+<p>在控制器中使用这个 DTO:</p>
+<figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// products.controller.ts</span></span><br><span class="line"><span class="meta">@Controller</span>(<span class="string">&#x27;products&#x27;</span>)</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">class</span> <span class="title class_">ProductsController</span> &#123;</span><br><span class="line"> <span class="meta">@Get</span>()</span><br><span class="line"> <span class="title function_">find</span>(<span class="params"><span class="meta">@Query</span>(<span class="string">&#x27;filter&#x27;</span>) <span class="attr">filter</span>: <span class="title class_">ProductFilterDto</span></span>) &#123;</span><br><span class="line"> <span class="comment">// 期望 filter.isFeatured 的值为 boolean false</span></span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(filter); </span><br><span class="line"> <span class="comment">// ... 业务逻辑</span></span><br><span class="line"> &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+
+<p>当请求 <code>.../products?filter[isFeatured]=false</code> 到达时,本来期望在 <code>find</code> 方法中得到的 <code>filter.isFeatured</code> 的值是布尔类型的 <code>false</code>。然而,控制台输出的结果却令人意外:<code>&#123; isFeatured: true &#125;</code></p>
+<h2 id="问题剖析"><a href="#问题剖析" class="headerlink" title="问题剖析"></a>问题剖析</h2><p>这个问题的根源在于 <code>class-transformer</code> 内部的转换执行顺序,以及 JavaScript 中 <code>Boolean</code> 函数的类型转换行为。</p>
+<p>所有通过 URL 查询参数传递的值,其本质都是字符串。当 NestJS 接收到请求时,<code>filter.isFeatured</code> 的原始值是字符串 <code>&quot;false&quot;</code>。</p>
+<p><code>ValidationPipe</code> 启动 <code>class-transformer</code> 的转换流程。由于在全局管道中设置了 <code>enableImplicitConversion: true</code>,转换器会首先检查 DTO 属性的 TypeScript 类型。</p>
+<ol>
+<li><strong>隐式转换优先执行</strong>:<code>class-transformer</code> 看到 <code>ProductFilterDto</code> 中的 <code>isFeatured</code> 属性被声明为 <code>boolean</code> 类型。</li>
+<li><strong>错误的类型转换</strong>:它立即尝试将字符串 <code>&quot;false&quot;</code> 转换为布尔值。这个转换等同于执行 <code>Boolean(&quot;false&quot;)</code>。在 JavaScript 中,任何非空字符串(包括 <code>&quot;false&quot;</code>)通过 <code>Boolean()</code> 构造函数转换后都会得到 <code>true</code>。</li>
+<li><strong>结果覆盖</strong>:这个错误的 <code>true</code> 值被作为该属性的转换结果。</li>
+</ol>
+<p>此时,即使尝试添加一个自定义的 <code>@Transform</code> 装饰器来手动处理这个问题,也为时已晚。</p>
+<p>例如,定义一个 <code>booleanTransformer</code>:</p>
+<figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// boolean-transformer.ts</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">const</span> <span class="title function_">booleanTransformer</span> = (<span class="params">&#123; value &#125;: &#123; value: <span class="built_in">any</span> &#125;</span>) =&gt; &#123;</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">typeof</span> value === <span class="string">&#x27;string&#x27;</span>) &#123;</span><br><span class="line"> <span class="keyword">return</span> value === <span class="string">&#x27;true&#x27;</span>;</span><br><span class="line"> &#125;</span><br><span class="line"> <span class="keyword">return</span> value;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
+
+<p>然后更新 dto:</p>
+<figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// product-filter.dto.ts (错误的尝试)</span></span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">Transform</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;class-transformer&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">IsBoolean</span>, <span class="title class_">IsOptional</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;class-validator&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; booleanTransformer &#125; <span class="keyword">from</span> <span class="string">&#x27;./boolean-transformer&#x27;</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">class</span> <span class="title class_">ProductFilterDto</span> &#123;</span><br><span class="line"> <span class="comment">// ...</span></span><br><span class="line"> <span class="meta">@IsOptional</span>()</span><br><span class="line"> <span class="meta">@Transform</span>(booleanTransformer) <span class="comment">// 添加自定义转换</span></span><br><span class="line"> <span class="meta">@IsBoolean</span>()</span><br><span class="line"> <span class="attr">isFeatured</span>?: <span class="built_in">boolean</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+
+<p>流程会变成这样:</p>
+<ol>
+<li>隐式转换首先执行:<code>Boolean(&quot;false&quot;)</code> -&gt; <code>true</code>。</li>
+<li><code>@Transform</code> 装饰器执行:此时传递给 <code>booleanTransformer</code> 的 <code>value</code> 已经是上一步错误转换后的布尔值 <code>true</code>,而不是原始的字符串 <code>&quot;false&quot;</code>。转换函数无从下手。</li>
+</ol>
+<p>最终结果依然是 <code>true</code>。</p>
+<h2 id="解决方案:用-any-绕过隐式转换"><a href="#解决方案:用-any-绕过隐式转换" class="headerlink" title="## 解决方案:用 any 绕过隐式转换"></a>## 解决方案:用 <code>any</code> 绕过隐式转换</h2><p>要解决这个问题,核心在于阻止 <code>class-transformer</code> 进行那次错误的、优先的隐式转换,从而确保自定义 <code>@Transform</code> 函数能接收到最原始的字符串值。</p>
+<p>最直接且侵入性最小的方法,是将 DTO 中相关属性的 TypeScript 类型从 <code>boolean</code> 改为 <code>any</code>。</p>
+<p><strong>修正后的 DTO 定义:</strong></p>
+<figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// product-filter.dto.ts (正确的实现)</span></span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">Transform</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;class-transformer&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">IsBoolean</span>, <span class="title class_">IsOptional</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;class-validator&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; booleanTransformer &#125; <span class="keyword">from</span> <span class="string">&#x27;./boolean-transformer&#x27;</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 一个更健壮的 booleanTransformer</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">const</span> <span class="title function_">robustBooleanTransformer</span> = (<span class="params">&#123; value &#125;: &#123; value: <span class="built_in">string</span> &#125;</span>) =&gt;</span><br><span class="line"> value === <span class="string">&#x27;true&#x27;</span> ? <span class="literal">true</span> : value === <span class="string">&#x27;false&#x27;</span> ? <span class="literal">false</span> : value;</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">class</span> <span class="title class_">ProductFilterDto</span> &#123;</span><br><span class="line"> <span class="meta">@IsOptional</span>()</span><br><span class="line"> <span class="meta">@Transform</span>(robustBooleanTransformer)</span><br><span class="line"> <span class="meta">@IsBoolean</span>()</span><br><span class="line"> <span class="attr">hasStock</span>?: <span class="built_in">any</span>; <span class="comment">// &lt;-- 类型从 boolean 改为 any</span></span><br><span class="line"></span><br><span class="line"> <span class="meta">@IsOptional</span>()</span><br><span class="line"> <span class="meta">@Transform</span>(robustBooleanTransformer)</span><br><span class="line"> <span class="meta">@IsBoolean</span>()</span><br><span class="line"> <span class="attr">isFeatured</span>?: <span class="built_in">any</span>; <span class="comment">// &lt;-- 类型从 boolean 改为 any</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+
+<p>这个改动虽然看起来放弃了 TypeScript 的类型检查,但在这个特定的场景下,它非常安全且有效。原因如下:</p>
+<ol>
+<li><strong>阻止隐式转换</strong>:当 <code>class-transformer</code> 看到属性类型是 <code>any</code> 时,它不知道该隐式转换成什么目标类型,因此会“跳过”这个属性的隐式转换步骤。</li>
+<li><strong><code>@Transform</code> 接管</strong>:如此一来,原始的字符串值(<code>&quot;true&quot;</code> 或 <code>&quot;false&quot;</code>)就能原封不动地传递给 <code>robustBooleanTransformer</code> 函数。该函数现在可以正确地将字符串转换为期望的布尔值。</li>
+<li><strong><code>@IsBoolean</code> 守门</strong>:在自定义转换完成后,<code>@IsBoolean()</code> 装饰器会进行最后的验证,确保存入 DTO 的最终值必须是 <code>true</code> 或 <code>false</code>。这保证了在业务逻辑中,该属性的类型是绝对安全的。</li>
+</ol>
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index 74c2786a..7288960a 100644
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@@ -170,6 +170,24 @@
<div class="post-list-item">
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使用 Runed intersection observer 与 tanstack query 实现通用的惰性加载组件
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@@ -170,6 +170,24 @@
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@@ -170,6 +170,24 @@
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肺功能检查数值
@@ -325,24 +343,6 @@
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@@ -170,6 +170,24 @@
<div class="post-list-item">
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身体往前倾,灵魂向后摇
diff --git a/archives/index.html b/archives/index.html
index a296c7b6..f136ecff 100644
--- a/archives/index.html
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@@ -170,6 +170,24 @@
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<a href="/2025/07/31/svelte-lazyquery/">
使用 Runed intersection observer 与 tanstack query 实现通用的惰性加载组件
@@ -325,24 +343,6 @@
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-
- 二〇二五年五月十二日
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@@ -170,6 +170,24 @@
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+
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二零二三年八月二十七日
@@ -325,24 +343,6 @@
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-
- caml_release_runtime_system导致的死锁问题
-
- </a>
- </div>
-
- <span class="post-date">Jun 28, 2023</span>
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<div class=paginator>
diff --git a/archives/page/11/index.html b/archives/page/11/index.html
index 97d5d288..0915dc77 100644
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@@ -170,6 +170,24 @@
<div class="post-list-item">
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+
+ caml_release_runtime_system导致的死锁问题
+
+ </a>
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灯笼草
@@ -325,24 +343,6 @@
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-
- 二零二三年四月二十二日
-
- </a>
- </div>
-
- <span class="post-date">Apr 22, 2023</span>
- </div>
-
-
<div id="paginator">
<div class=paginator>
diff --git a/archives/page/12/index.html b/archives/page/12/index.html
index 3c7c915f..e88e1dd7 100644
--- a/archives/page/12/index.html
+++ b/archives/page/12/index.html
@@ -170,6 +170,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2023/04/22/%E4%BA%8C%E9%9B%B6%E4%BA%8C%E4%B8%89%E5%B9%B4%E5%9B%9B%E6%9C%88%E4%BA%8C%E5%8D%81%E4%BA%8C%E6%97%A5/">
+
+ 二零二三年四月二十二日
+
+ </a>
+ </div>
+
+ <span class="post-date">Apr 22, 2023</span>
+ </div>
+
+
+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
<a href="/2023/03/14/%E8%9E%BA%E5%86%85%E9%85%AF%E7%89%87/">
螺内酯片
@@ -325,24 +343,6 @@
</div>
-
-
-
-
-
- <div class="post-list-item">
- <div class="post-title">
- <a href="/2023/02/24/%E4%BA%8C%E9%9B%B6%E4%BA%8C%E4%B8%89%E5%B9%B4%E4%BA%8C%E6%9C%88%E4%BA%8C%E5%8D%81%E5%9B%9B%E6%97%A5/">
-
- 二零二三年二月二十四日
-
- </a>
- </div>
-
- <span class="post-date">Feb 24, 2023</span>
- </div>
-
-
<div id="paginator">
<div class=paginator>
diff --git a/archives/page/13/index.html b/archives/page/13/index.html
index 7f40adf5..d94cf296 100644
--- a/archives/page/13/index.html
+++ b/archives/page/13/index.html
@@ -170,6 +170,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2023/02/24/%E4%BA%8C%E9%9B%B6%E4%BA%8C%E4%B8%89%E5%B9%B4%E4%BA%8C%E6%9C%88%E4%BA%8C%E5%8D%81%E5%9B%9B%E6%97%A5/">
+
+ 二零二三年二月二十四日
+
+ </a>
+ </div>
+
+ <span class="post-date">Feb 24, 2023</span>
+ </div>
+
+
+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
<a href="/2023/02/22/%E4%BA%8C%E9%9B%B6%E4%BA%8C%E4%B8%89%E5%B9%B4%E4%BA%8C%E6%9C%88%E4%BA%8C%E5%8D%81%E4%BA%8C%E6%97%A5/">
二零二三年二月二十二日
@@ -327,24 +345,6 @@
</div>
-
-
-
-
-
- <div class="post-list-item">
- <div class="post-title">
- <a href="/2022/03/14/%E4%BA%8C%E9%9B%B6%E4%BA%8C%E4%BA%8C%E5%B9%B4%E4%B8%89%E6%9C%88%E5%8D%81%E5%9B%9B%E6%97%A5/">
-
- 二零二二年三月十四日
-
- </a>
- </div>
-
- <span class="post-date">Mar 14, 2022</span>
- </div>
-
-
<div id="paginator">
<div class=paginator>
diff --git a/archives/page/14/index.html b/archives/page/14/index.html
index 76f50655..4c066759 100644
--- a/archives/page/14/index.html
+++ b/archives/page/14/index.html
@@ -170,6 +170,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2022/03/14/%E4%BA%8C%E9%9B%B6%E4%BA%8C%E4%BA%8C%E5%B9%B4%E4%B8%89%E6%9C%88%E5%8D%81%E5%9B%9B%E6%97%A5/">
+
+ 二零二二年三月十四日
+
+ </a>
+ </div>
+
+ <span class="post-date">Mar 14, 2022</span>
+ </div>
+
+
+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
<a href="/2022/01/01/%E4%BA%8C%E9%9B%B6%E4%BA%8C%E4%BA%8C%E5%B9%B4%E4%B8%80%E6%9C%88%E4%B8%80%E6%97%A5/">
二零二二年一月一日
diff --git a/archives/page/2/index.html b/archives/page/2/index.html
index 67c429ca..835a161d 100644
--- a/archives/page/2/index.html
+++ b/archives/page/2/index.html
@@ -170,6 +170,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2025/05/12/%E4%BA%8C%E3%80%87%E4%BA%8C%E4%BA%94%E5%B9%B4%E4%BA%94%E6%9C%88%E5%8D%81%E4%BA%8C%E6%97%A5/">
+
+ 二〇二五年五月十二日
+
+ </a>
+ </div>
+
+ <span class="post-date">May 12, 2025</span>
+ </div>
+
+
+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
<a href="/2025/05/08/Multiplayer-Collaborative-Systems-tips/">
多人协作系统中的实现策略 (CRDT,锁等实现方案)
@@ -325,24 +343,6 @@
</div>
-
-
-
-
-
- <div class="post-list-item">
- <div class="post-title">
- <a href="/2025/03/20/TDD-%E5%92%8C-DDD-%E7%9A%84%E4%B8%80%E4%BA%9B%E5%B0%8F%E6%83%B3%E6%B3%95/">
-
- TDD 和 DDD 的一些小想法
-
- </a>
- </div>
-
- <span class="post-date">Mar 20, 2025</span>
- </div>
-
-
<div id="paginator">
<div class=paginator>
diff --git a/archives/page/3/index.html b/archives/page/3/index.html
index eb037d6e..0e4a0b9d 100644
--- a/archives/page/3/index.html
+++ b/archives/page/3/index.html
@@ -170,6 +170,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2025/03/20/TDD-%E5%92%8C-DDD-%E7%9A%84%E4%B8%80%E4%BA%9B%E5%B0%8F%E6%83%B3%E6%B3%95/">
+
+ TDD 和 DDD 的一些小想法
+
+ </a>
+ </div>
+
+ <span class="post-date">Mar 20, 2025</span>
+ </div>
+
+
+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
<a href="/2025/03/20/%E8%82%BA%E5%8A%9F%E8%83%BD%E6%A3%80%E6%9F%A5%E6%95%B0%E5%80%BC/">
肺功能检查数值
@@ -325,24 +343,6 @@
</div>
-
-
-
-
-
- <div class="post-list-item">
- <div class="post-title">
- <a href="/2025/02/10/%E5%AE%9E%E6%97%B6%E6%90%9C%E7%B4%A2%E4%B8%AD%E7%9A%84%E9%98%B2%E6%8A%96%E5%87%BD%E6%95%B0/">
-
- 实时搜索中的防抖函数
-
- </a>
- </div>
-
- <span class="post-date">Feb 10, 2025</span>
- </div>
-
-
<div id="paginator">
<div class=paginator>
diff --git a/archives/page/4/index.html b/archives/page/4/index.html
index 1ef91eda..1dd6cf91 100644
--- a/archives/page/4/index.html
+++ b/archives/page/4/index.html
@@ -170,6 +170,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2025/02/10/%E5%AE%9E%E6%97%B6%E6%90%9C%E7%B4%A2%E4%B8%AD%E7%9A%84%E9%98%B2%E6%8A%96%E5%87%BD%E6%95%B0/">
+
+ 实时搜索中的防抖函数
+
+ </a>
+ </div>
+
+ <span class="post-date">Feb 10, 2025</span>
+ </div>
+
+
+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
<a href="/2025/01/19/%E8%BA%AB%E4%BD%93%E5%BE%80%E5%89%8D%E5%80%BE%EF%BC%8C%E7%81%B5%E9%AD%82%E5%90%91%E5%90%8E%E6%91%87/">
身体往前倾,灵魂向后摇
@@ -327,24 +345,6 @@
</div>
-
-
-
-
-
- <div class="post-list-item">
- <div class="post-title">
- <a href="/2024/10/06/Obsidian-Vault-%E7%9A%84-obsidian-%E7%9B%AE%E5%BD%95%E4%B8%AD%E7%9A%84%E5%90%84%E6%96%87%E4%BB%B6%E4%BD%9C%E7%94%A8/">
-
- Obsidian Vault 的 .obsidian 目录中的各文件作用
-
- </a>
- </div>
-
- <span class="post-date">Oct 6, 2024</span>
- </div>
-
-
<div id="paginator">
<div class=paginator>
diff --git a/archives/page/5/index.html b/archives/page/5/index.html
index c261de76..987a9e61 100644
--- a/archives/page/5/index.html
+++ b/archives/page/5/index.html
@@ -170,6 +170,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2024/10/06/Obsidian-Vault-%E7%9A%84-obsidian-%E7%9B%AE%E5%BD%95%E4%B8%AD%E7%9A%84%E5%90%84%E6%96%87%E4%BB%B6%E4%BD%9C%E7%94%A8/">
+
+ Obsidian Vault 的 .obsidian 目录中的各文件作用
+
+ </a>
+ </div>
+
+ <span class="post-date">Oct 6, 2024</span>
+ </div>
+
+
+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
<a href="/2024/09/27/Turborepo-%E7%AE%80%E8%BF%B0/">
Turborepo 简述
@@ -325,24 +343,6 @@
</div>
-
-
-
-
-
- <div class="post-list-item">
- <div class="post-title">
- <a href="/2024/08/12/%E7%9B%B4%E7%B3%BB%E8%A1%80%E4%BA%B2%E4%B9%8B%E9%97%B4%E4%B8%8D%E8%83%BD%E7%9B%B4%E6%8E%A5%E8%BE%93%E8%A1%80/">
-
- 直系血亲之间不能直接输血
-
- </a>
- </div>
-
- <span class="post-date">Aug 12, 2024</span>
- </div>
-
-
<div id="paginator">
<div class=paginator>
diff --git a/archives/page/6/index.html b/archives/page/6/index.html
index 11c74683..3ff2fb0a 100644
--- a/archives/page/6/index.html
+++ b/archives/page/6/index.html
@@ -170,6 +170,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2024/08/12/%E7%9B%B4%E7%B3%BB%E8%A1%80%E4%BA%B2%E4%B9%8B%E9%97%B4%E4%B8%8D%E8%83%BD%E7%9B%B4%E6%8E%A5%E8%BE%93%E8%A1%80/">
+
+ 直系血亲之间不能直接输血
+
+ </a>
+ </div>
+
+ <span class="post-date">Aug 12, 2024</span>
+ </div>
+
+
+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
<a href="/2024/08/02/%E4%BA%8C%E3%80%87%E4%BA%8C%E5%9B%9B%E5%B9%B4%E5%85%AB%E6%9C%88%E4%B8%80%E6%97%A5/">
二〇二四年八月一日
@@ -325,24 +343,6 @@
</div>
-
-
-
-
-
- <div class="post-list-item">
- <div class="post-title">
- <a href="/2024/05/13/%E7%BB%99%E5%B0%B8%E4%BD%93%E4%B8%8A-ECMO-%E5%B9%B6%E7%BB%B4%E6%8C%81%E5%BF%83%E8%B7%B3/">
-
- 给尸体上 ECMO 并维持心跳
-
- </a>
- </div>
-
- <span class="post-date">May 13, 2024</span>
- </div>
-
-
<div id="paginator">
<div class=paginator>
diff --git a/archives/page/7/index.html b/archives/page/7/index.html
index a13343cc..3e192e7d 100644
--- a/archives/page/7/index.html
+++ b/archives/page/7/index.html
@@ -170,6 +170,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2024/05/13/%E7%BB%99%E5%B0%B8%E4%BD%93%E4%B8%8A-ECMO-%E5%B9%B6%E7%BB%B4%E6%8C%81%E5%BF%83%E8%B7%B3/">
+
+ 给尸体上 ECMO 并维持心跳
+
+ </a>
+ </div>
+
+ <span class="post-date">May 13, 2024</span>
+ </div>
+
+
+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
<a href="/2024/05/07/%E4%BA%8C%E3%80%87%E4%BA%8C%E5%9B%9B%E5%B9%B4%E4%BA%94%E6%9C%88%E4%B8%83%E6%97%A5/">
二〇二四年五月七日
@@ -325,24 +343,6 @@
</div>
-
-
-
-
-
- <div class="post-list-item">
- <div class="post-title">
- <a href="/2024/01/23/%E4%BA%8C%E3%80%87%E4%BA%8C%E5%9B%9B%E5%B9%B4%E4%B8%80%E6%9C%88%E4%BA%8C%E5%8D%81%E4%B8%89%E6%97%A5/">
-
- 二〇二四年一月二十三日
-
- </a>
- </div>
-
- <span class="post-date">Jan 23, 2024</span>
- </div>
-
-
<div id="paginator">
<div class=paginator>
diff --git a/archives/page/8/index.html b/archives/page/8/index.html
index 866ae250..67f7afb7 100644
--- a/archives/page/8/index.html
+++ b/archives/page/8/index.html
@@ -170,6 +170,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2024/01/23/%E4%BA%8C%E3%80%87%E4%BA%8C%E5%9B%9B%E5%B9%B4%E4%B8%80%E6%9C%88%E4%BA%8C%E5%8D%81%E4%B8%89%E6%97%A5/">
+
+ 二〇二四年一月二十三日
+
+ </a>
+ </div>
+
+ <span class="post-date">Jan 23, 2024</span>
+ </div>
+
+
+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
<a href="/2024/01/22/Rescript-React-Native/">
Rescript and React Native
@@ -327,24 +345,6 @@
</div>
-
-
-
-
-
- <div class="post-list-item">
- <div class="post-title">
- <a href="/2023/10/25/%E5%84%BF%E7%AB%A5%E6%96%B0%E5%9E%8B%E5%86%A0%E7%8A%B6%E7%97%85%E6%AF%92Omicron%E6%A0%AA%E5%92%8C%E8%82%BA%E7%82%8E%E6%94%AF%E5%8E%9F%E4%BD%93%E6%B7%B7%E5%90%88%E6%84%9F%E6%9F%93%E9%87%8D%E7%97%87%E8%82%BA%E7%82%8E1%E4%BE%8B/">
-
- 儿童新型冠状病毒Omicron株和肺炎支原体混合感染重症肺炎1例
-
- </a>
- </div>
-
- <span class="post-date">Oct 25, 2023</span>
- </div>
-
-
<div id="paginator">
<div class=paginator>
diff --git a/archives/page/9/index.html b/archives/page/9/index.html
index 4fb2c283..4f9162e6 100644
--- a/archives/page/9/index.html
+++ b/archives/page/9/index.html
@@ -170,6 +170,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2023/10/25/%E5%84%BF%E7%AB%A5%E6%96%B0%E5%9E%8B%E5%86%A0%E7%8A%B6%E7%97%85%E6%AF%92Omicron%E6%A0%AA%E5%92%8C%E8%82%BA%E7%82%8E%E6%94%AF%E5%8E%9F%E4%BD%93%E6%B7%B7%E5%90%88%E6%84%9F%E6%9F%93%E9%87%8D%E7%97%87%E8%82%BA%E7%82%8E1%E4%BE%8B/">
+
+ 儿童新型冠状病毒Omicron株和肺炎支原体混合感染重症肺炎1例
+
+ </a>
+ </div>
+
+ <span class="post-date">Oct 25, 2023</span>
+ </div>
+
+
+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
<a href="/2023/10/25/Radiographic-Absence-of-the-Left-Humeral-Head/">
Radiographic Absence of the Left Humeral Head
@@ -325,24 +343,6 @@
</div>
-
-
-
-
-
- <div class="post-list-item">
- <div class="post-title">
- <a href="/2023/09/13/%E4%BA%8C%E9%9B%B6%E4%BA%8C%E4%B8%89%E5%B9%B4%E4%B9%9D%E6%9C%88%E5%8D%81%E4%B8%89%E6%97%A5/">
-
- 二零二三年九月十三日
-
- </a>
- </div>
-
- <span class="post-date">Sep 13, 2023</span>
- </div>
-
-
<div id="paginator">
<div class=paginator>
diff --git a/search.xml b/search.xml
index 4adf0221..10107697 100644
--- a/search.xml
+++ b/search.xml
@@ -2741,6 +2741,61 @@ await prisma.$transaction(async tx =&gt; &#123;
</tags>
</entry>
<entry>
+ <title>NestJS 中 enableImplicitConversion 与 @Transform 的冲突</title>
+ <url>/2025/08/13/nestjs-enableImplicitConversion-and-transform/</url>
+ <content><![CDATA[<p>在 NestJS 生态中,<code>class-validator</code> 和 <code>class-transformer</code> 这两个库提供了以声明式的方式对 DTO 进行验证和转换。然而在处理布尔值时,如果在全局验证管道或仅仅是在局部同时开启了 <code>enableImplicitConversion</code>,可能会引入一个极其隐蔽且违反直觉的 Bug:前端传过来的布尔值恒为 true。</p>
+<h2 id="一个简单的筛选功能"><a href="#一个简单的筛选功能" class="headerlink" title="一个简单的筛选功能"></a>一个简单的筛选功能</h2><p>假设正在开发一个电子商务平台的 API,需要实现一个产品列表的筛选功能。希望能够根据产品是否有库存 (<code>hasStock</code>)、是否为特色产品 (<code>isFeatured</code>) 等布尔条件进行筛选。</p>
+<p>前端发出的请求 URL 可能如下所示: <code>/products?filter[hasStock]=true&amp;filter[isFeatured]=false</code></p>
+<p>在 NestJS 后端,首先会在 <code>main.ts</code> 中配置一个全局的 <code>ValidationPipe</code>,以自动处理 DTO 的验证和转换。为了方便,通常会启用 <code>enableImplicitConversion</code>,期望它能自动将 URL 查询参数中的字符串(如 <code>&quot;123&quot;</code>, <code>&quot;true&quot;</code>)转换为 DTO 中定义的类型(<code>number</code>, <code>boolean</code>):</p>
+<figure class="highlight typescript"><table><tr><td class="code"><pre><span class="line"><span class="comment">// main.ts</span></span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">ValidationPipe</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;@nestjs/common&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">NestFactory</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;@nestjs/core&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">AppModule</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;./app.module&#x27;</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">async</span> <span class="keyword">function</span> <span class="title function_">bootstrap</span>(<span class="params"></span>) &#123;</span><br><span class="line"> <span class="keyword">const</span> app = <span class="keyword">await</span> <span class="title class_">NestFactory</span>.<span class="title function_">create</span>(<span class="title class_">AppModule</span>);</span><br><span class="line"></span><br><span class="line"> app.<span class="title function_">useGlobalPipes</span>(</span><br><span class="line"> <span class="keyword">new</span> <span class="title class_">ValidationPipe</span>(&#123;</span><br><span class="line"> <span class="attr">transform</span>: <span class="literal">true</span>, <span class="comment">// 启用转换</span></span><br><span class="line"> <span class="attr">whitelist</span>: <span class="literal">true</span>,</span><br><span class="line"> <span class="attr">forbidNonWhitelisted</span>: <span class="literal">true</span>,</span><br><span class="line"> <span class="attr">transformOptions</span>: &#123;</span><br><span class="line"> <span class="comment">// 启用基于 TypeScript 类型的隐式转换</span></span><br><span class="line"> <span class="attr">enableImplicitConversion</span>: <span class="literal">true</span>, </span><br><span class="line"> &#125;,</span><br><span class="line"> &#125;),</span><br><span class="line"> );</span><br><span class="line"> </span><br><span class="line"> <span class="comment">// ... 其他配置</span></span><br><span class="line"> <span class="keyword">await</span> app.<span class="title function_">listen</span>(<span class="number">3000</span>);</span><br><span class="line">&#125;</span><br><span class="line"><span class="title function_">bootstrap</span>();</span><br></pre></td></tr></table></figure>
+
+<p>接着,定义一个 <code>ProductFilterDto</code> 来接收这些筛选条件。</p>
+<p><strong>一个看似正确的 DTO 定义:</strong></p>
+<figure class="highlight typescript"><table><tr><td class="code"><pre><span class="line"><span class="comment">// product-filter.dto.ts</span></span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">IsBoolean</span>, <span class="title class_">IsOptional</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;class-validator&#x27;</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">class</span> <span class="title class_">ProductFilterDto</span> &#123;</span><br><span class="line"> <span class="meta">@IsOptional</span>()</span><br><span class="line"> <span class="meta">@IsBoolean</span>()</span><br><span class="line"> <span class="attr">hasStock</span>?: <span class="built_in">boolean</span>;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@IsOptional</span>()</span><br><span class="line"> <span class="meta">@IsBoolean</span>()</span><br><span class="line"> <span class="attr">isFeatured</span>?: <span class="built_in">boolean</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+
+<p>在控制器中使用这个 DTO:</p>
+<figure class="highlight typescript"><table><tr><td class="code"><pre><span class="line"><span class="comment">// products.controller.ts</span></span><br><span class="line"><span class="meta">@Controller</span>(<span class="string">&#x27;products&#x27;</span>)</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">class</span> <span class="title class_">ProductsController</span> &#123;</span><br><span class="line"> <span class="meta">@Get</span>()</span><br><span class="line"> <span class="title function_">find</span>(<span class="params"><span class="meta">@Query</span>(<span class="string">&#x27;filter&#x27;</span>) <span class="attr">filter</span>: <span class="title class_">ProductFilterDto</span></span>) &#123;</span><br><span class="line"> <span class="comment">// 期望 filter.isFeatured 的值为 boolean false</span></span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(filter); </span><br><span class="line"> <span class="comment">// ... 业务逻辑</span></span><br><span class="line"> &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+
+<p>当请求 <code>.../products?filter[isFeatured]=false</code> 到达时,本来期望在 <code>find</code> 方法中得到的 <code>filter.isFeatured</code> 的值是布尔类型的 <code>false</code>。然而,控制台输出的结果却令人意外:<code>&#123; isFeatured: true &#125;</code></p>
+<h2 id="问题剖析"><a href="#问题剖析" class="headerlink" title="问题剖析"></a>问题剖析</h2><p>这个问题的根源在于 <code>class-transformer</code> 内部的转换执行顺序,以及 JavaScript 中 <code>Boolean</code> 函数的类型转换行为。</p>
+<p>所有通过 URL 查询参数传递的值,其本质都是字符串。当 NestJS 接收到请求时,<code>filter.isFeatured</code> 的原始值是字符串 <code>&quot;false&quot;</code>。</p>
+<p><code>ValidationPipe</code> 启动 <code>class-transformer</code> 的转换流程。由于在全局管道中设置了 <code>enableImplicitConversion: true</code>,转换器会首先检查 DTO 属性的 TypeScript 类型。</p>
+<ol>
+<li><strong>隐式转换优先执行</strong>:<code>class-transformer</code> 看到 <code>ProductFilterDto</code> 中的 <code>isFeatured</code> 属性被声明为 <code>boolean</code> 类型。</li>
+<li><strong>错误的类型转换</strong>:它立即尝试将字符串 <code>&quot;false&quot;</code> 转换为布尔值。这个转换等同于执行 <code>Boolean(&quot;false&quot;)</code>。在 JavaScript 中,任何非空字符串(包括 <code>&quot;false&quot;</code>)通过 <code>Boolean()</code> 构造函数转换后都会得到 <code>true</code>。</li>
+<li><strong>结果覆盖</strong>:这个错误的 <code>true</code> 值被作为该属性的转换结果。</li>
+</ol>
+<p>此时,即使尝试添加一个自定义的 <code>@Transform</code> 装饰器来手动处理这个问题,也为时已晚。</p>
+<p>例如,定义一个 <code>booleanTransformer</code>:</p>
+<figure class="highlight typescript"><table><tr><td class="code"><pre><span class="line"><span class="comment">// boolean-transformer.ts</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">const</span> <span class="title function_">booleanTransformer</span> = (<span class="params">&#123; value &#125;: &#123; value: <span class="built_in">any</span> &#125;</span>) =&gt; &#123;</span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">typeof</span> value === <span class="string">&#x27;string&#x27;</span>) &#123;</span><br><span class="line"> <span class="keyword">return</span> value === <span class="string">&#x27;true&#x27;</span>;</span><br><span class="line"> &#125;</span><br><span class="line"> <span class="keyword">return</span> value;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
+
+<p>然后更新 dto:</p>
+<figure class="highlight typescript"><table><tr><td class="code"><pre><span class="line"><span class="comment">// product-filter.dto.ts (错误的尝试)</span></span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">Transform</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;class-transformer&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">IsBoolean</span>, <span class="title class_">IsOptional</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;class-validator&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; booleanTransformer &#125; <span class="keyword">from</span> <span class="string">&#x27;./boolean-transformer&#x27;</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">class</span> <span class="title class_">ProductFilterDto</span> &#123;</span><br><span class="line"> <span class="comment">// ...</span></span><br><span class="line"> <span class="meta">@IsOptional</span>()</span><br><span class="line"> <span class="meta">@Transform</span>(booleanTransformer) <span class="comment">// 添加自定义转换</span></span><br><span class="line"> <span class="meta">@IsBoolean</span>()</span><br><span class="line"> <span class="attr">isFeatured</span>?: <span class="built_in">boolean</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+
+<p>流程会变成这样:</p>
+<ol>
+<li>隐式转换首先执行:<code>Boolean(&quot;false&quot;)</code> -&gt; <code>true</code>。</li>
+<li><code>@Transform</code> 装饰器执行:此时传递给 <code>booleanTransformer</code> 的 <code>value</code> 已经是上一步错误转换后的布尔值 <code>true</code>,而不是原始的字符串 <code>&quot;false&quot;</code>。转换函数无从下手。</li>
+</ol>
+<p>最终结果依然是 <code>true</code>。</p>
+<h2 id="解决方案:用-any-绕过隐式转换"><a href="#解决方案:用-any-绕过隐式转换" class="headerlink" title="## 解决方案:用 any 绕过隐式转换"></a>## 解决方案:用 <code>any</code> 绕过隐式转换</h2><p>要解决这个问题,核心在于阻止 <code>class-transformer</code> 进行那次错误的、优先的隐式转换,从而确保自定义 <code>@Transform</code> 函数能接收到最原始的字符串值。</p>
+<p>最直接且侵入性最小的方法,是将 DTO 中相关属性的 TypeScript 类型从 <code>boolean</code> 改为 <code>any</code>。</p>
+<p><strong>修正后的 DTO 定义:</strong></p>
+<figure class="highlight typescript"><table><tr><td class="code"><pre><span class="line"><span class="comment">// product-filter.dto.ts (正确的实现)</span></span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">Transform</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;class-transformer&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; <span class="title class_">IsBoolean</span>, <span class="title class_">IsOptional</span> &#125; <span class="keyword">from</span> <span class="string">&#x27;class-validator&#x27;</span>;</span><br><span class="line"><span class="keyword">import</span> &#123; booleanTransformer &#125; <span class="keyword">from</span> <span class="string">&#x27;./boolean-transformer&#x27;</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 一个更健壮的 booleanTransformer</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">const</span> <span class="title function_">robustBooleanTransformer</span> = (<span class="params">&#123; value &#125;: &#123; value: <span class="built_in">string</span> &#125;</span>) =&gt;</span><br><span class="line"> value === <span class="string">&#x27;true&#x27;</span> ? <span class="literal">true</span> : value === <span class="string">&#x27;false&#x27;</span> ? <span class="literal">false</span> : value;</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">class</span> <span class="title class_">ProductFilterDto</span> &#123;</span><br><span class="line"> <span class="meta">@IsOptional</span>()</span><br><span class="line"> <span class="meta">@Transform</span>(robustBooleanTransformer)</span><br><span class="line"> <span class="meta">@IsBoolean</span>()</span><br><span class="line"> <span class="attr">hasStock</span>?: <span class="built_in">any</span>; <span class="comment">// &lt;-- 类型从 boolean 改为 any</span></span><br><span class="line"></span><br><span class="line"> <span class="meta">@IsOptional</span>()</span><br><span class="line"> <span class="meta">@Transform</span>(robustBooleanTransformer)</span><br><span class="line"> <span class="meta">@IsBoolean</span>()</span><br><span class="line"> <span class="attr">isFeatured</span>?: <span class="built_in">any</span>; <span class="comment">// &lt;-- 类型从 boolean 改为 any</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
+
+<p>这个改动虽然看起来放弃了 TypeScript 的类型检查,但在这个特定的场景下,它非常安全且有效。原因如下:</p>
+<ol>
+<li><strong>阻止隐式转换</strong>:当 <code>class-transformer</code> 看到属性类型是 <code>any</code> 时,它不知道该隐式转换成什么目标类型,因此会“跳过”这个属性的隐式转换步骤。</li>
+<li><strong><code>@Transform</code> 接管</strong>:如此一来,原始的字符串值(<code>&quot;true&quot;</code> 或 <code>&quot;false&quot;</code>)就能原封不动地传递给 <code>robustBooleanTransformer</code> 函数。该函数现在可以正确地将字符串转换为期望的布尔值。</li>
+<li><strong><code>@IsBoolean</code> 守门</strong>:在自定义转换完成后,<code>@IsBoolean()</code> 装饰器会进行最后的验证,确保存入 DTO 的最终值必须是 <code>true</code> 或 <code>false</code>。这保证了在业务逻辑中,该属性的类型是绝对安全的。</li>
+</ol>
+<p>好用,爱用。</p>
+]]></content>
+ <tags>
+ <tag>Technique</tag>
+ </tags>
+ </entry>
+ <entry>
<title>NestJS 嵌套查询参数解析错误分析与解决方案</title>
<url>/2025/07/29/nestjs-nested-object-dto/</url>
<content><![CDATA[<p>在开发 NestJS 应用程序时,一个常见的场景是根据复杂的条件筛选资源。当使用嵌套查询参数来表达这些条件时,例如通过 URL <code>http://localhost:3000/products/filter?filters[price][min]=100</code>,可能会意外地遇到 <code>property filters[price][min] should not exist</code> 错误。本文将深入剖析此问题背后的原因,并提供针对 Express 和 Fastify 两种底层框架的解决方案。</p>
diff --git a/tags/Technique/index.html b/tags/Technique/index.html
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--- a/tags/Technique/index.html
+++ b/tags/Technique/index.html
@@ -177,6 +177,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2025/08/13/nestjs-enableImplicitConversion-and-transform/">
+
+ NestJS 中 enableImplicitConversion 与 @Transform 的冲突
+
+ </a>
+ </div>
+
+ <span class="post-date">Aug 13, 2025</span>
+ </div>
+
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+++ b/tags/Technique/page/2/index.html
@@ -177,6 +177,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2025/03/30/F-%E9%87%8D%E8%BD%BD%E8%A7%A3%E6%9E%90%E9%97%AE%E9%A2%98/">
+
+ F# 重载解析问题
+
+ </a>
+ </div>
+
+ <span class="post-date">Mar 30, 2025</span>
+ </div>
+
+
+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
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Scala 3 (Capture Checking)
@@ -332,26 +350,6 @@
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-
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+++ b/tags/Technique/page/3/index.html
@@ -177,6 +177,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2024/12/15/OCaml-News-2024-7/">
+
+ OCaml News 2024-7
+
+ </a>
+ </div>
+
+ <span class="post-date">Dec 15, 2024</span>
+ </div>
+
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+
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+
+ <div class="post-list-item">
+ <div class="post-title">
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@@ -332,24 +350,6 @@
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- <div class="post-list-item">
- <div class="post-title">
- <a href="/2024/06/27/OCaml-News-2024-5/">
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- OCaml News 2024-5
-
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+++ b/tags/Technique/page/4/index.html
@@ -177,6 +177,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2024/06/27/OCaml-News-2024-5/">
+
+ OCaml News 2024-5
+
+ </a>
+ </div>
+
+ <span class="post-date">Jun 27, 2024</span>
+ </div>
+
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+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
<a href="/2024/06/06/NET-AOT-%E4%B8%8B%E7%9A%84-F-%E5%91%BD%E4%BB%A4%E8%A1%8C%E5%8F%82%E6%95%B0%E8%A7%A3%E6%9E%90%E5%BA%93%E9%80%89%E6%8B%A9/">
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@@ -334,24 +352,6 @@
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-
- <span class="post-date">Oct 5, 2023</span>
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-
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+++ b/tags/Technique/page/5/index.html
@@ -177,6 +177,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2023/10/05/v8%E4%B8%AD%E7%9A%84Number-toString/">
+
+ v8中的Number.toString()
+
+ </a>
+ </div>
+
+ <span class="post-date">Oct 5, 2023</span>
+ </div>
+
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-
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-
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- </div>
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--- a/tags/Technique/page/6/index.html
+++ b/tags/Technique/page/6/index.html
@@ -177,6 +177,24 @@
<div class="post-list-item">
<div class="post-title">
+ <a href="/2023/05/01/Rust-%E8%99%9A%E8%A1%A8%E5%B8%83%E5%B1%80%E8%A7%84%E5%88%99%E4%BB%8B%E7%BB%8D/">
+
+ Rust 虚表布局规则介绍
+
+ </a>
+ </div>
+
+ <span class="post-date">May 1, 2023</span>
+ </div>
+
+
+
+
+
+
+
+ <div class="post-list-item">
+ <div class="post-title">
<a href="/2023/04/30/TypeScript-With-Rust-Errors-No-Try-Catch-Heresy/">
TypeScript With Rust Errors, No Try Catch, Heresy