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| author | muqiuhan <[email protected]> | 2025-02-19 05:50:06 +0000 |
|---|---|---|
| committer | muqiuhan <[email protected]> | 2025-02-19 05:50:06 +0000 |
| commit | bba0b720db3103d963291b1b258863900d11a56a (patch) | |
| tree | 2a90dd427782422cc22b7eb8578b2109b72a0001 /search.xml | |
| parent | a4e4ad60aa8b904015c47d98c6fb13dd30ae1d4f (diff) | |
| download | blog-bba0b720db3103d963291b1b258863900d11a56a.tar.gz | |
deploy: adae24e1e3421dd2d625937b06a939bc3fe3a37d
Diffstat (limited to 'search.xml')
| -rw-r--r-- | search.xml | 129 |
1 files changed, 129 insertions, 0 deletions
@@ -1583,6 +1583,79 @@ </tags> </entry> <entry> + <title>Prisma 关系型数据库的 Self-relations</title> + <url>/2025/02/18/Prisma-%E5%85%B3%E7%B3%BB%E5%9E%8B%E6%95%B0%E6%8D%AE%E5%BA%93%E7%9A%84-Self-relations/</url> + <content><![CDATA[<blockquote> +<p>A relation field can also reference its own model, in this case the relation is called a <em>self-relation</em>. Self-relations can be of any cardinality, 1-1, 1-n and m-n.</p> +</blockquote> +<h2 id="一对一"><a href="#一对一" class="headerlink" title="一对一"></a>一对一</h2><figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">model User {</span><br><span class="line"> id Int @id @default(autoincrement())</span><br><span class="line"> name String?</span><br><span class="line"> successorId Int? @unique</span><br><span class="line"> successor User? @relation("BlogOwnerHistory", fields: [successorId], references: [id])</span><br><span class="line"> predecessor User? @relation("BlogOwnerHistory")</span><br><span class="line">}</span><br></pre></td></tr></table></figure> + +<p>User 展现了这样一个模型：</p> +<ul> +<li>User 可以有一个或零个前驱（predecessor）</li> +<li>User 可以有一个或零个后继（successor）</li> +</ul> +<p>注意：不能要求前驱和后继都必须存在，这两个必须有一个是可选的，否则没办法创建第一个 User。</p> +<p>要创建一对一的 self-relation：</p> +<ul> +<li>关系的两端都必须定义一个共享相同名称的 <code>@relation</code> 属性（<code>BlogOwnerHistory</code>）</li> +<li>关系字段必须是<a href="https://www.prisma.io/docs/orm/prisma-schema/data-model/relations#relation-fields">完全注释</a>的。例如 <code>successor</code> 字段需要定义 <code>field</code> 和 <code>references</code> 参数。</li> +<li>关系字段必须由外键支持。<code>successor</code> 字段由 <code>successorId</code> 外键提供支持，该外键引用 <code>id</code> 字段中的值。<code>successorId</code> 还需要 <code>@unique</code> 属性来保证一对一的关系。****</li> +</ul> +<blockquote> +<p>一对一的 self-relation 需要两个端点，即使这两个端点是同一条数据。</p> +</blockquote> +<p>而在关系型数据库中，一对一的 self-relation 可以用如下 SQL 描述：</p> +<figure class="highlight sql"><table><tr><td class="code"><pre><span class="line"><span class="keyword">CREATE</span> <span class="keyword">TABLE</span> "User" (</span><br><span class="line"> id SERIAL <span class="keyword">PRIMARY</span> KEY,</span><br><span class="line"> "name" TEXT,</span><br><span class="line"> "successorId" <span class="type">INTEGER</span></span><br><span class="line">);</span><br><span class="line"></span><br><span class="line"><span class="keyword">ALTER</span> <span class="keyword">TABLE</span> "User" <span class="keyword">ADD</span> <span class="keyword">CONSTRAINT</span> fk_successor_user <span class="keyword">FOREIGN</span> KEY ("successorId") <span class="keyword">REFERENCES</span> "User" (id);</span><br><span class="line"></span><br><span class="line"><span class="keyword">ALTER</span> <span class="keyword">TABLE</span> "User" <span class="keyword">ADD</span> <span class="keyword">CONSTRAINT</span> successor_unique <span class="keyword">UNIQUE</span> ("successorId");</span><br></pre></td></tr></table></figure> + +<h2 id="一对多"><a href="#一对多" class="headerlink" title="一对多"></a>一对多</h2><figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">model User {</span><br><span class="line"> id Int @id @default(autoincrement())</span><br><span class="line"> name String?</span><br><span class="line"> teacherId Int?</span><br><span class="line"> teacher User? @relation("TeacherStudents", fields: [teacherId], references: [id])</span><br><span class="line"> students User[] @relation("TeacherStudents")</span><br><span class="line">}</span><br></pre></td></tr></table></figure> + +<p>User 展现了这样一个模型：</p> +<ul> +<li>一个 User 只能有零个或一个 teacher</li> +<li>一个 User 可以有零个或多个 students</li> +</ul> +<blockquote> +<p>可以通过将 <code>teacher</code> 字段设<a href="https://www.prisma.io/docs/orm/prisma-schema/data-model/models#optional-and-mandatory-fields">为 required</a> 来要求每个 User 都有一名 teacher。</p> +</blockquote> +<p>用 SQL 描述 User model：</p> +<figure class="highlight sql"><table><tr><td class="code"><pre><span class="line"><span class="keyword">CREATE</span> <span class="keyword">TABLE</span> "User" (</span><br><span class="line"> id SERIAL <span class="keyword">PRIMARY</span> KEY,</span><br><span class="line"> "name" TEXT,</span><br><span class="line"> "teacherId" <span class="type">INTEGER</span></span><br><span class="line">);</span><br><span class="line"></span><br><span class="line"><span class="keyword">ALTER</span> <span class="keyword">TABLE</span> "User" <span class="keyword">ADD</span> <span class="keyword">CONSTRAINT</span> fk_teacherid_user <span class="keyword">FOREIGN</span> KEY ("teacherId") <span class="keyword">REFERENCES</span> "User" (id);</span><br></pre></td></tr></table></figure> + +<p><code>teacherId</code> 没有使用 <code>UNIQUE</code> 约束，这代表着多个 students 可以有同一个 teacher</p> +<h2 id="多对多"><a href="#多对多" class="headerlink" title="多对多"></a>多对多</h2><figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">model User {</span><br><span class="line"> id Int @id @default(autoincrement())</span><br><span class="line"> name String?</span><br><span class="line"> followedBy User[] @relation("UserFollows")</span><br><span class="line"> following User[] @relation("UserFollows")</span><br><span class="line">}</span><br></pre></td></tr></table></figure> + +<ul> +<li>一个 User 可以被零个或多个 Users 关注</li> +<li>一个 User 可以关注零个或多个 Users</li> +</ul> +<blockquote> +<p>对于关系型数据库，多对多的关系是隐式的，这意味着 Prisma ORM 会在底层数据库中维护一个 <a href="https://www.prisma.io/docs/orm/prisma-schema/data-model/relations/many-to-many-relations#relation-tables">relation table</a>:<br>A relation table (also sometimes called a <em>JOIN</em>, <em>link</em> or <em>pivot</em> table) connects two or more other tables and therefore creates a <em>relation</em> between them. Creating relation tables is a common data modelling practice in SQL to represent relationships between different entities. In essence it means that “one m-n relation is modeled as two 1-n relations in the database”.</p> +<p>We recommend using <a href="https://www.prisma.io/docs/orm/prisma-schema/data-model/relations/many-to-many-relations#implicit-many-to-many-relations">implicit</a> m-n-relations, where Prisma ORM automatically generates the relation table in the underlying database. <a href="https://www.prisma.io/docs/orm/prisma-schema/data-model/relations/many-to-many-relations#explicit-many-to-many-relations">Explicit</a> m-n-relations should be used when you need to store additional data in the relations, such as the date the relation was created.</p> +</blockquote> +<p>如果需要需要通过多对多的关系来保存其他字段，也可以创建<a href="https://www.prisma.io/docs/orm/prisma-schema/data-model/relations/many-to-many-relations#explicit-many-to-many-relations">显式</a>的多对多 self 关系：</p> +<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">model User {</span><br><span class="line"> id Int @id @default(autoincrement())</span><br><span class="line"> name String?</span><br><span class="line"> followedBy Follows[] @relation("followedBy")</span><br><span class="line"> following Follows[] @relation("following")</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">model Follows {</span><br><span class="line"> followedBy User @relation("followedBy", fields: [followedById], references: [id])</span><br><span class="line"> followedById Int</span><br><span class="line"> following User @relation("following", fields: [followingId], references: [id])</span><br><span class="line"> followingId Int</span><br><span class="line"></span><br><span class="line"> @@id([followingId, followedById])</span><br><span class="line">}</span><br></pre></td></tr></table></figure> + +<p>在关系型数据库中，可以用如下 SQL 描述:</p> +<figure class="highlight sql"><table><tr><td class="code"><pre><span class="line"><span class="keyword">CREATE</span> <span class="keyword">TABLE</span> "User" (</span><br><span class="line"> id <span class="type">integer</span> <span class="keyword">DEFAULT</span> nextval(<span class="string">'"User_id_seq"'</span>::regclass) <span class="keyword">PRIMARY</span> KEY,</span><br><span class="line"> name text</span><br><span class="line">);</span><br><span class="line"><span class="keyword">CREATE</span> <span class="keyword">TABLE</span> "_UserFollows" (</span><br><span class="line"> "A" <span class="type">integer</span> <span class="keyword">NOT</span> <span class="keyword">NULL</span> <span class="keyword">REFERENCES</span> "User"(id) <span class="keyword">ON</span> <span class="keyword">DELETE</span> CASCADE <span class="keyword">ON</span> <span class="keyword">UPDATE</span> CASCADE,</span><br><span class="line"> "B" <span class="type">integer</span> <span class="keyword">NOT</span> <span class="keyword">NULL</span> <span class="keyword">REFERENCES</span> "User"(id) <span class="keyword">ON</span> <span class="keyword">DELETE</span> CASCADE <span class="keyword">ON</span> <span class="keyword">UPDATE</span> CASCADE</span><br><span class="line">);</span><br></pre></td></tr></table></figure> + +<h2 id="在同一模型上建立多个-self-relations"><a href="#在同一模型上建立多个-self-relations" class="headerlink" title="在同一模型上建立多个 self-relations"></a>在同一模型上建立多个 self-relations</h2><figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">model User {</span><br><span class="line"> id Int @id @default(autoincrement())</span><br><span class="line"> name String?</span><br><span class="line"> teacherId Int?</span><br><span class="line"> teacher User? @relation("TeacherStudents", fields: [teacherId], references: [id])</span><br><span class="line"> students User[] @relation("TeacherStudents")</span><br><span class="line"> followedBy User[] @relation("UserFollows")</span><br><span class="line"> following User[] @relation("UserFollows")</span><br><span class="line">}</span><br></pre></td></tr></table></figure> + +<h2 id="REFS"><a href="#REFS" class="headerlink" title="REFS."></a>REFS.</h2><ul> +<li><a href="https://www.prisma.io/docs/orm/prisma-schema/data-model/relations#relation-fields">fully annotated</a></li> +<li><a href="https://www.prisma.io/docs/orm/prisma-schema/data-model/models#optional-and-mandatory-fields">required</a></li> +<li><a href="https://www.prisma.io/docs/orm/prisma-schema/data-model/relations/many-to-many-relations#implicit-many-to-many-relations">implicit</a></li> +<li><a href="https://www.prisma.io/docs/orm/prisma-schema/data-model/relations/many-to-many-relations#relation-tables">relation table</a></li> +<li><a href="https://www.prisma.io/docs/orm/prisma-schema/data-model/relations/many-to-many-relations#explicit-many-to-many-relations">explicit</a></li> +</ul> +]]></content> + <tags> + <tag>Technique</tag> + <tag>Web</tag> + <tag>Typescript</tag> + <tag>Database</tag> + </tags> + </entry> + <entry> <title>Radiographic Absence of the Left Humeral Head</title> <url>/2023/10/25/Radiographic-Absence-of-the-Left-Humeral-Head/</url> <content><![CDATA[<p>A 67-year-old man with thoracolumbar scoliosis, poor mobility, and history of frequent falls presented to the emergency department with 2 months of left shoulder pain, stiffness and reduced range of motion, and numbness and paresthesias in his left upper extremity.</p> @@ -1604,6 +1677,48 @@ </tags> </entry> <entry> + <title>Repository pattern in Typescript</title> + <url>/2025/02/19/Repository-pattern-in-Typescript/</url> + <content><![CDATA[<blockquote> +<p>The Repository design pattern is a <a href="https://www.geeksforgeeks.org/structural-design-patterns/">structural pattern</a> that abstracts data access, providing a centralized way to manage data operations. By separating the data layer from business logic, it enhances code maintainability, testability, and flexibility, making it easier to work with various data sources in an application.</p> +</blockquote> +<p>抽象化数据访问层的主要作用是将应用的业务逻辑与对数据库的数据访问等实现细节进行解耦。DB 框架的更改不应该影响到应用程序的核心服务，并且它们应该对业务逻辑代码透明。</p> +<p>业务服务应该只依赖于抽象，而不是实现，数据服务同理。</p> +<hr> +<h1 id="Intro"><a href="#Intro" class="headerlink" title="Intro."></a>Intro.</h1><p>例如，此时有一个书籍存储的微服务，并且有一个“添加新书籍”的操作用例，在此用例中可以通过使用 <code>Book</code> 这个 <em>Repository</em> 来添加新书籍，而 <code>Book</code> 具体使用什么数据库，怎么存并不是业务需要关心的事情。</p> +<h2 id="具体实现方式"><a href="#具体实现方式" class="headerlink" title="具体实现方式"></a>具体实现方式</h2><p>假设有以下实体类型定义：</p> +<figure class="highlight typescript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">export</span> <span class="keyword">class</span> <span class="title class_">Author</span> {</span><br><span class="line"> <span class="attr">firstName</span>: <span class="built_in">string</span>;</span><br><span class="line"> <span class="attr">lastName</span>: <span class="built_in">string</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">class</span> <span class="title class_">Genre</span> {</span><br><span class="line"> <span class="attr">name</span>: <span class="built_in">string</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">class</span> <span class="title class_">Book</span> {</span><br><span class="line"> <span class="attr">title</span>: <span class="built_in">string</span>;</span><br><span class="line"> <span class="attr">author</span>: <span class="title class_">Author</span>;</span><br><span class="line"> <span class="attr">genre</span>: <span class="title class_">Genre</span>;</span><br><span class="line"> <span class="attr">publishDate</span>: <span class="title class_">Date</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure> + +<h3 id="抽象化"><a href="#抽象化" class="headerlink" title="抽象化"></a>抽象化</h3><p>第一步是抽象化出一个通用的 <em>Repository</em> ，其中包含通用的操作：</p> +<figure class="highlight typescript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">export</span> <span class="keyword">abstract</span> <span class="keyword">class</span> <span class="title class_">IGenericRepository</span><T> {</span><br><span class="line"> <span class="keyword">abstract</span> <span class="title function_">getAll</span>(): <span class="title class_">Promise</span><T[]>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">abstract</span> <span class="title function_">get</span>(<span class="attr">id</span>: <span class="built_in">string</span>): <span class="title class_">Promise</span><T>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">abstract</span> <span class="title function_">create</span>(<span class="attr">item</span>: T): <span class="title class_">Promise</span><T>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">abstract</span> <span class="title function_">update</span>(<span class="attr">id</span>: <span class="built_in">string</span>, <span class="attr">item</span>: T);</span><br><span class="line">}</span><br></pre></td></tr></table></figure> + +<ul> +<li>这里具体有那些函数可以根据需要（业务）自己定义。</li> +<li>类型参数 <code>T</code> 表示每个实体。</li> +</ul> +<p>接着，定义一个数据服务，其中包含使用 <code>IGenericRepositoiry</code> 定义的具体实例对应的 _Repository_：</p> +<figure class="highlight typescript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">import</span> { <span class="title class_">Author</span>, <span class="title class_">Book</span>, <span class="title class_">Genre</span> } <span class="keyword">from</span> <span class="string">'../entities'</span>;</span><br><span class="line"><span class="keyword">import</span> { <span class="title class_">IGenericRepository</span> } <span class="keyword">from</span> <span class="string">'./generic-repository.abstract'</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">abstract</span> <span class="keyword">class</span> <span class="title class_">IDataServices</span> {</span><br><span class="line"> <span class="keyword">abstract</span> <span class="attr">authors</span>: <span class="title class_">IGenericRepository</span><<span class="title class_">Author</span>>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">abstract</span> <span class="attr">books</span>: <span class="title class_">IGenericRepository</span><<span class="title class_">Book</span>>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">abstract</span> <span class="attr">genres</span>: <span class="title class_">IGenericRepository</span><<span class="title class_">Genre</span>>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure> + +<ul> +<li>这里有三个 <em>Repository</em> 分别对应不同的实体。</li> +<li><code>IGenericRepository</code> 中定义的函数是每个 <em>Repository</em> 公开的通用存储函数。</li> +</ul> +<p>以上这些就是对业务中的实体的 <em>Repository</em> 抽象，这样就隔离开了业务和存储逻辑，例如使用 MongoDB，可以实现一个 <code>MongoGenericRepository</code>：</p> +<figure class="highlight typescript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">import</span> { <span class="title class_">Model</span> } <span class="keyword">from</span> <span class="string">'mongoose'</span>;</span><br><span class="line"><span class="keyword">import</span> { <span class="title class_">IGenericRepository</span> } <span class="keyword">from</span> <span class="string">'../../../core'</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_">MongoGenericRepository</span><T> <span class="keyword">implements</span> <span class="title class_">IGenericRepository</span><T> {</span><br><span class="line"> <span class="keyword">private</span> <span class="attr">_repository</span>: <span class="title class_">Model</span><T>;</span><br><span class="line"> <span class="keyword">private</span> <span class="attr">_populateOnFind</span>: <span class="built_in">string</span>[];</span><br><span class="line"></span><br><span class="line"> <span class="title function_">constructor</span>(<span class="params">repository: Model<T>, populateOnFind: <span class="built_in">string</span>[] = []</span>) {</span><br><span class="line"> <span class="variable language_">this</span>.<span class="property">_repository</span> = repository;</span><br><span class="line"> <span class="variable language_">this</span>.<span class="property">_populateOnFind</span> = populateOnFind;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="title function_">getAll</span>(): <span class="title class_">Promise</span><T[]> {</span><br><span class="line"> <span class="keyword">return</span> <span class="variable language_">this</span>.<span class="property">_repository</span>.<span class="title function_">find</span>().<span class="title function_">populate</span>(<span class="variable language_">this</span>.<span class="property">_populateOnFind</span>).<span class="title function_">exec</span>();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="title function_">get</span>(<span class="attr">id</span>: <span class="built_in">any</span>): <span class="title class_">Promise</span><T> {</span><br><span class="line"> <span class="keyword">return</span> <span class="variable language_">this</span>.<span class="property">_repository</span>.<span class="title function_">findById</span>(id).<span class="title function_">populate</span>(<span class="variable language_">this</span>.<span class="property">_populateOnFind</span>).<span class="title function_">exec</span>();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="title function_">create</span>(<span class="attr">item</span>: T): <span class="title class_">Promise</span><T> {</span><br><span class="line"> <span class="keyword">return</span> <span class="variable language_">this</span>.<span class="property">_repository</span>.<span class="title function_">create</span>(item);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="title function_">update</span>(<span class="params">id: <span class="built_in">string</span>, item: T</span>) {</span><br><span class="line"> <span class="keyword">return</span> <span class="variable language_">this</span>.<span class="property">_repository</span>.<span class="title function_">findByIdAndUpdate</span>(id, item);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure> + +<p>然后实现一个 <code>MongoDataServices</code>:</p> +<figure class="highlight typescript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">import</span> { <span class="title class_">Injectable</span>, <span class="title class_">OnApplicationBootstrap</span> } <span class="keyword">from</span> <span class="string">'@nestjs/common'</span>;</span><br><span class="line"><span class="keyword">import</span> { <span class="title class_">InjectModel</span> } <span class="keyword">from</span> <span class="string">'@nestjs/mongoose'</span>;</span><br><span class="line"><span class="keyword">import</span> { <span class="title class_">Model</span> } <span class="keyword">from</span> <span class="string">'mongoose'</span>;</span><br><span class="line"><span class="keyword">import</span> { <span class="title class_">IDataServices</span> } <span class="keyword">from</span> <span class="string">'../../../core'</span>;</span><br><span class="line"><span class="keyword">import</span> { <span class="title class_">MongoGenericRepository</span> } <span class="keyword">from</span> <span class="string">'./mongo-generic-repository'</span>;</span><br><span class="line"><span class="keyword">import</span> {</span><br><span class="line"> <span class="title class_">Author</span>,</span><br><span class="line"> <span class="title class_">AuthorDocument</span>,</span><br><span class="line"> <span class="title class_">Book</span>,</span><br><span class="line"> <span class="title class_">BookDocument</span>,</span><br><span class="line"> <span class="title class_">Genre</span>,</span><br><span class="line"> <span class="title class_">GenreDocument</span>,</span><br><span class="line">} <span class="keyword">from</span> <span class="string">'./model'</span>;</span><br><span class="line"></span><br><span class="line"><span class="meta">@Injectable</span>()</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">class</span> <span class="title class_">MongoDataServices</span></span><br><span class="line"> <span class="keyword">implements</span> <span class="title class_">IDataServices</span>, <span class="title class_">OnApplicationBootstrap</span></span><br><span class="line">{</span><br><span class="line"> <span class="attr">authors</span>: <span class="title class_">MongoGenericRepository</span><<span class="title class_">Author</span>>;</span><br><span class="line"> <span class="attr">books</span>: <span class="title class_">MongoGenericRepository</span><<span class="title class_">Book</span>>;</span><br><span class="line"> <span class="attr">genres</span>: <span class="title class_">MongoGenericRepository</span><<span class="title class_">Genre</span>>;</span><br><span class="line"></span><br><span class="line"> <span class="title function_">constructor</span>(<span class="params"></span></span><br><span class="line"><span class="params"> <span class="meta">@InjectModel</span>(Author.name)</span></span><br><span class="line"><span class="params"> <span class="keyword">private</span> AuthorRepository: Model<AuthorDocument>,</span></span><br><span class="line"><span class="params"> <span class="meta">@InjectModel</span>(Book.name)</span></span><br><span class="line"><span class="params"> <span class="keyword">private</span> BookRepository: Model<BookDocument>,</span></span><br><span class="line"><span class="params"> <span class="meta">@InjectModel</span>(Genre.name)</span></span><br><span class="line"><span class="params"> <span class="keyword">private</span> GenreRepository: Model<GenreDocument>,</span></span><br><span class="line"><span class="params"> </span>) {}</span><br><span class="line"></span><br><span class="line"> <span class="title function_">onApplicationBootstrap</span>(<span class="params"></span>) {</span><br><span class="line"> <span class="variable language_">this</span>.<span class="property">authors</span> = <span class="keyword">new</span> <span class="title class_">MongoGenericRepository</span><<span class="title class_">Author</span>>(<span class="variable language_">this</span>.<span class="property">AuthorRepository</span>);</span><br><span class="line"> <span class="variable language_">this</span>.<span class="property">books</span> = <span class="keyword">new</span> <span class="title class_">MongoGenericRepository</span><<span class="title class_">Book</span>>(<span class="variable language_">this</span>.<span class="property">BookRepository</span>, [</span><br><span class="line"> <span class="string">'author'</span>,</span><br><span class="line"> <span class="string">'genre'</span>,</span><br><span class="line"> ]);</span><br><span class="line"> <span class="variable language_">this</span>.<span class="property">genres</span> = <span class="keyword">new</span> <span class="title class_">MongoGenericRepository</span><<span class="title class_">Genre</span>>(<span class="variable language_">this</span>.<span class="property">GenreRepository</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure> + +<p>以上。</p> +]]></content> + <tags> + <tag>Technique</tag> + <tag>Web</tag> + <tag>Typescript</tag> + <tag>Software-Engineering</tag> + </tags> + </entry> + <entry> <title>Rescript and React Native</title> <url>/2024/01/22/Rescript-React-Native/</url> <content><![CDATA[<p>Rescript 对 React Native 的支持还算可以，但如今的 RN 已经是 Expo 的 RN 了，所以仍然有些落后，在这个 template 中，我测试了 rescript + rescript-react-native + expo + nativewind 的组合，可以跑起来：</p> @@ -4080,6 +4195,20 @@ </tags> </entry> <entry> + <title>身体往前倾，灵魂向后摇</title> + <url>/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/</url> + <content><![CDATA[<p>后摇( Post-Rock )是用摇滚乐器作非摇滚的用途，吉他对音色和结构的推动作用超过了Riff和主旋律。后摇的关键问题除了电子的启用之外，还有多层次打击乐器的出现。</p> +<p>现代社会的后摇创作者们不必为任何形式和任何器物所限制，庞大的音乐历史使得任何形式都展现为能为现代人所应用的形式，现代技术所提供的音乐制作功能则使得作为乐器的器物在后摇中不必再被特地强调。</p> +<p>而对于后摇的受众即聆听者而言，这一现代性的音乐则在正真意义上解放了听众，使得听众成为肆意解读的读者。后摇的解放意义完成了作品自创作完成后从作者向听众的让渡，作品的拥有者不是作者本人，而恰恰是一群无从计数的听众， 作为独特个体而非集体的听众。</p> +<p>因此，后摇的出现意味着创作者与受众的双向失责。两者在彼此自私自取的艺术行为中消弭了主体与客体这一古老的二分法。</p> +<p>极致的喧闹与绝对的安静并无区别。</p> +]]></content> + <tags> + <tag>Life</tag> + <tag>Music</tag> + </tags> + </entry> + <entry> <title>过度疲劳的六种表现</title> <url>/2023/10/12/%E8%BF%87%E5%BA%A6%E7%96%B2%E5%8A%B3%E7%9A%84%E5%85%AD%E7%A7%8D%E8%A1%A8%E7%8E%B0/</url> <content><![CDATA[<ol> |