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<meta property="og:description" content="&emsp;&emsp;由于框架底层自带的软删除默认使用的是删除时间（默认字段名deleted_at）作来标记某条记录是否已被删除。 存在问题:当正常执行一条查询时，第一个过滤条件就是deleted_at is null, 在mysql数据库中null是无法被建立索引的，所以在数据量大的时候，会造成很严重的查询缓慢。 解决方案：修改deleted_at 字段类型为int，默认值为0，无符号，不">
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<p>  由于框架底层自带的软删除默认使用的是删除时间（默认字段名deleted_at）作来标记某条记录是否已被删除。</p>
<ul>
<li>存在问题:当正常执行一条查询时，第一个过滤条件就是deleted_at is null, 在mysql数据库中null是无法被建立索引的，所以在数据量大的时候，会造成很严重的查询缓慢。</li>
<li>解决方案：修改deleted_at 字段类型为int，默认值为0，无符号，不为null，并通过存入时间戳标记是否删除。这里会涉及到模型底层的相关修改。</li>
</ul>
<p>在实际开发中，一般是不随意修改框架底层的，所以个人选择重写,将SoftDeletes类和SoftDeletingScope类源码复制修改即可。</p>
<h4 id="触发原理"><a href="#触发原理" class="headerlink" title="触发原理"></a>触发原理</h4><p>当在任意一个模型中 use SoftDeletes之后，是如何在最终的查询语句里添加deleted_at=0 的,以下面模型为例<br><figure class="highlight php"><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="keyword">namespace</span> <span class="title">App</span>;</span><br><span class="line"><span class="keyword">use</span> <span class="title">App</span>\<span class="title">Rewrites</span>\<span class="title">SoftDeletes</span>; <span class="comment">//重写的软删除类</span></span><br><span class="line"><span class="keyword">use</span> <span class="title">Illuminate</span>\<span class="title">Database</span>\<span class="title">Eloquent</span>\<span class="title">Model</span>;</span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Department</span> <span class="keyword">extends</span> <span class="title">Model</span> </span></span><br><span class="line"><span class="class"></span>{</span><br><span class="line"> <span class="keyword">use</span> <span class="title">SoftDeletes</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">protected</span> $primaryKey = <span class="string">'department_id'</span>;</span><br><span class="line"> <span class="keyword">protected</span> $table = <span class="string">'department'</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure><br><a id="more"></a><br>在Department模型实例化时，通过基类的构造方法中bootIfNotBooted,然后执行boot方法,再触发bootTraits方法。在bootTraits方法中获取模型中用到的trait类，然后循环遍历，判断trait类中是否存在bootClassname的方法,有则执行。<br><figure class="highlight php"><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></pre></td><td class="code"><pre><span class="line"><span class="comment">//基类Model</span></span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__construct</span><span class="params">(array $attributes = [])</span></span></span><br><span class="line"><span class="function"></span>{ </span><br><span class="line"> ...</span><br><span class="line"> <span class="keyword">$this</span>->bootIfNotBooted();</span><br><span class="line"> ..</span><br><span class="line">}</span><br><span class="line"><span class="keyword">protected</span> <span class="keyword">static</span> <span class="function"><span class="keyword">function</span> <span class="title">bootTraits</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{ </span><br><span class="line"> <span class="comment">//获取模型中用到的trait类</span></span><br><span class="line"> <span class="keyword">foreach</span> (class_uses_recursive(get_called_class()) <span class="keyword">as</span> $trait) {</span><br><span class="line"> <span class="comment">// 如果softDelete类中存在bootsoftDelete方法</span></span><br><span class="line"> <span class="keyword">if</span> (method_exists(get_called_class(), $method = <span class="string">'boot'</span>.class_basename($trait))) {</span><br><span class="line"> <span class="comment">//静态调用，执行SoftDeletes中的bootSoftDeletes方法</span></span><br><span class="line"> forward_static_call([get_called_class(), $method]);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h4 id="bootSoftDeletes"><a href="#bootSoftDeletes" class="headerlink" title="bootSoftDeletes"></a>bootSoftDeletes</h4><p>启用软删除，为当前模型添加一个全局查询SoftDeletingScope, 在Model类中获取一个newQuery时，就会应用这个全局Scope，即执行SoftDeletingScope类上的apply方法。<br><figure class="highlight php"><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></pre></td><td class="code"><pre><span class="line"><span class="comment">//SoftDeletes</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="function"><span class="keyword">function</span> <span class="title">bootSoftDeletes</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">static</span>::addGlobalScope(<span class="keyword">new</span> SoftDeletingScope);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">//Model</span></span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">newQuery</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> $builder = <span class="keyword">$this</span>->newQueryWithoutScopes();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">$this</span>->applyGlobalScopes($builder);</span><br><span class="line">}</span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">applyGlobalScopes</span><span class="params">($builder)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">foreach</span> (<span class="keyword">$this</span>->getGlobalScopes() <span class="keyword">as</span> $scope) {</span><br><span class="line"> <span class="comment">//应用Scope</span></span><br><span class="line"> $scope->apply($builder, <span class="keyword">$this</span>);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> $builder;</span><br><span class="line">}</span><br></pre></td></tr></table></figure><br>关于Scope的简单说明，假设User模型上有一个常用的多个条件查询,并定义其为一个scope。这样就可以在该模型上的其他查询上直接‘拼接’scope条件。<br><figure class="highlight clean"><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></pre></td><td class="code"><pre><span class="line"><span class="comment">//抽象比喻，非具体实现代码</span></span><br><span class="line"> $scope = <span class="keyword">where</span>(<span class="string">'statu1'</span>,<span class="number">1</span>)-><span class="keyword">where</span>(<span class="string">'status2'</span>,<span class="number">2</span>)-><span class="keyword">where</span>(<span class="string">'status3'</span>,<span class="number">3</span>);</span><br><span class="line"></span><br><span class="line"> User::<span class="keyword">where</span>(<span class="string">'user_id'</span>,<span class="number">1</span>)->$scope();</span><br></pre></td></tr></table></figure><br>执行apply方法，使用了软删除scope。这里的是重写后的代码。源码使用的whereNull(‘deleted_at’)查询。<br><figure class="highlight php"><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></pre></td><td class="code"><pre><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">apply</span><span class="params">(Builder $builder, Model $model)</span></span></span><br><span class="line"><span class="function"></span>{ </span><br><span class="line"> <span class="comment">//源码 whereNull($model->getQualifiedDeletedAtColumn())</span></span><br><span class="line"> $builder->where($model->getQualifiedDeletedAtColumn(),<span class="number">0</span>);</span><br><span class="line"> <span class="keyword">$this</span>->extend($builder);</span><br><span class="line">}</span><br></pre></td></tr></table></figure><br>我们要的目的很明确，在使用软删除的模型上都加上where(‘deleted_at’,0)条件。下面修改SoftDeletingScope中的所有相关查询条件:<br><figure class="highlight php"><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><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//SoftDeletingScope类</span></span><br><span class="line"><span class="comment">//时间格式统一使用当前时间戳</span></span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">extend</span><span class="params">(Builder $builder)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> ...</span><br><span class="line"> <span class="keyword">return</span> $builder->update([</span><br><span class="line"> $column => time(), <span class="comment">//修改</span></span><br><span class="line"> ]);</span><br><span class="line"> ....</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">//软删除数据恢复</span></span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">addRestore</span><span class="params">(Builder $builder)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> ...</span><br><span class="line"> <span class="keyword">return</span> $builder->update([$builder->getModel()->getDeletedAtColumn() => <span class="number">0</span>]);</span><br><span class="line"> ...</span><br><span class="line">}</span><br><span class="line"><span class="comment">//只查询被软删除的数据</span></span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">addOnlyTrashed</span><span class="params">(Builder $builder)</span></span></span><br><span class="line"><span class="function"></span>{ ...</span><br><span class="line"> $builder->getQuery()->where($model->getQualifiedDeletedAtColumn(),<span class="string">'>'</span>,<span class="number">0</span>);</span><br><span class="line"> ...</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">//SoftDelete类,当执行模型的delete()方法时,实则执行runSoftDelete</span></span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">runSoftDelete</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> $query = <span class="keyword">$this</span>->newQueryWithoutScopes()->where(<span class="keyword">$this</span>->getKeyName(), <span class="keyword">$this</span>->getKey());</span><br><span class="line"></span><br><span class="line"> <span class="keyword">$this</span>->{<span class="keyword">$this</span>->getDeletedAtColumn()} = $time = time(); </span><br><span class="line"></span><br><span class="line"> $query->update([<span class="keyword">$this</span>->getDeletedAtColumn() => time()]); <span class="comment">// 更新时间戳</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h4 id="withTrash修复"><a href="#withTrash修复" class="headerlink" title="withTrash修复"></a>withTrash修复</h4><p>当修改完毕后，当使用模型上的delete、get、onlyTrashed等方法这些都是没有问题，除了withTrash 方法。用一个实际查询举例<br><figure class="highlight clean"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Department::withTrash()-><span class="keyword">where</span>(<span class="string">'id'</span>,<span class="string">'<'</span>,<span class="number">9</span>)->get()</span><br><span class="line"> <span class="comment">//执行流程与前者是不同的,但结果一样。</span></span><br><span class="line">Department::<span class="keyword">where</span>(<span class="string">'id'</span>,<span class="string">'<'</span>,<span class="number">9</span>)->withTrash()->get()</span><br></pre></td></tr></table></figure></p>
<p>当执行new static实例化模型时，软删除scope（ 即where(deleted_at,0) ）就已经被加上去了。由于我们需要查询所有数据，包括被标记为已删除的数据，所有需要把查询条件中的deleted_at=0去掉。<br><figure class="highlight php"><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><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//SoftDeletingScope</span></span><br><span class="line"><span class="comment">//前者，直接执行SoftDelete类上的withTrashed方法，获取当前模型实例，并移除软删除scope</span></span><br><span class="line"> <span class="keyword">public</span> <span class="keyword">static</span> <span class="function"><span class="keyword">function</span> <span class="title">withTrashed</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{ </span><br><span class="line"> <span class="keyword">return</span> (<span class="keyword">new</span> <span class="keyword">static</span>)->newQueryWithoutScope(<span class="keyword">new</span> SoftDeletingScope);</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">newQueryWithoutScope</span><span class="params">($scope)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">$this</span>->getGlobalScope($scope)->remove($builder = <span class="keyword">$this</span>->newQuery(), <span class="keyword">$this</span>);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> $builder;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">//后者实则是执行Eloquent\Builder上的withTrash方法，</span></span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__call</span><span class="params">($method, $parameters)</span></span></span><br><span class="line"><span class="function"></span>{ </span><br><span class="line"> <span class="comment">//macros数组的值则是在SoftDeletingScope中执行apply方法里的extend方法，储存的</span></span><br><span class="line"> <span class="keyword">if</span> (<span class="keyword">isset</span>(<span class="keyword">$this</span>->macros[$method])) {</span><br><span class="line"> array_unshift($parameters, <span class="keyword">$this</span>);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> call_user_func_array(<span class="keyword">$this</span>->macros[$method], $parameters);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="comment">//macros数组来源,这里便为withTrashed绑定了一个回调并存放在macros</span></span><br><span class="line"><span class="comment">//SoftDeletingScope</span></span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">addWithTrashed</span><span class="params">(Builder $builder)</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> $builder->macro(<span class="string">'withTrashed'</span>, <span class="function"><span class="keyword">function</span> <span class="params">(Builder $builder)</span> </span>{</span><br><span class="line"> <span class="keyword">$this</span>->remove($builder, $builder->getModel());</span><br><span class="line"> <span class="keyword">return</span> $builder;</span><br><span class="line"> });</span><br><span class="line"> }</span><br><span class="line"></span><br></pre></td></tr></table></figure><br>两种执行的最终结果都是执行了SoftDeletingScope中的remove方法,传入Eloquent\Builder,Department 作为参数,其目的就是去掉Builder里的软删除查询条件。<br>模型的最终数据，是通过Database\Query\Builder执行编译完成的查询语句来获取的。而查询语句的生成原理在这里很重要。<br><figure class="highlight awk"><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><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br></pre></td><td class="code"><pre><span class="line"><span class="regexp">//</span>比如执行如下代码,分别对比源码及修改后的语句生成方式</span><br><span class="line"> <span class="variable">$res</span> = Department::where(<span class="string">'id'</span>,<span class="string">'<'</span>,<span class="number">0</span>)->get();</span><br><span class="line"> <span class="regexp">//</span>在语句完成前,对比Query\Builder中wheres和bindings属性数据</span><br><span class="line"></span><br><span class="line"> <span class="regexp">//</span>修改源码之前</span><br><span class="line"> <span class="regexp">//</span> wheres: array:<span class="number">1</span> [▼</span><br><span class="line"> <span class="regexp">//</span> <span class="number">0</span> => array:<span class="number">3</span> [▼</span><br><span class="line"> <span class="regexp">//</span> <span class="string">"type"</span> => <span class="string">"Null"</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"column"</span> => <span class="string">"department.deleted_at"</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"boolean"</span> => <span class="string">"and"</span></span><br><span class="line"> <span class="regexp">//</span> ],</span><br><span class="line"> <span class="regexp">//</span> <span class="number">1</span> => array:<span class="number">5</span> [▼</span><br><span class="line"> <span class="regexp">//</span> <span class="string">"type"</span> => <span class="string">"Basic"</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"column"</span> => <span class="string">"department_id"</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"operator"</span> => <span class="string">"<"</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"value"</span> => <span class="number">9</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"boolean"</span> => <span class="string">"and"</span></span><br><span class="line"> <span class="regexp">//</span> ]</span><br><span class="line"> <span class="regexp">//</span> ]</span><br><span class="line"> <span class="regexp">//</span> bindings: [ <span class="number">0</span> => <span class="number">9</span> ]</span><br><span class="line"></span><br><span class="line"> <span class="regexp">//</span>生成的预处理语句</span><br><span class="line"> <span class="string">"select * from department where department.deleted_at is null and department_id < ?"</span></span><br><span class="line"></span><br><span class="line"> <span class="regexp">//</span>withTrashed, 直接移除wheres中的第一个数组</span><br><span class="line"> <span class="string">"select * from department where department_id < ?"</span></span><br><span class="line"></span><br><span class="line"> <span class="regexp">//</span>修改源码之后</span><br><span class="line"> <span class="regexp">//</span> wheres: array:<span class="number">1</span> [▼</span><br><span class="line"> <span class="regexp">//</span> <span class="number">0</span> => array:<span class="number">3</span> [▼</span><br><span class="line"> <span class="regexp">//</span> <span class="string">"type"</span> => <span class="string">"Basic"</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"column"</span> => <span class="string">"department.deleted_at"</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"operator"</span> => <span class="string">"<"</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"value"</span> => <span class="number">9</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"boolean"</span> => <span class="string">"and"</span></span><br><span class="line"> <span class="regexp">//</span> ],</span><br><span class="line"> <span class="regexp">//</span> <span class="number">1</span> => array:<span class="number">5</span> [▼</span><br><span class="line"> <span class="regexp">//</span> <span class="string">"type"</span> => <span class="string">"Basic"</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"column"</span> => <span class="string">"department_id"</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"operator"</span> => <span class="string">"<"</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"value"</span> => <span class="number">9</span></span><br><span class="line"> <span class="regexp">//</span> <span class="string">"boolean"</span> => <span class="string">"and"</span></span><br><span class="line"> <span class="regexp">//</span> ]</span><br><span class="line"> <span class="regexp">//</span> ]</span><br><span class="line"> <span class="regexp">//</span> bindings: [ <span class="number">0</span> => <span class="number">0</span> , <span class="number">1</span>=> <span class="number">9</span>] </span><br><span class="line"></span><br><span class="line"> <span class="regexp">//</span>生成的预处理语句</span><br><span class="line"> <span class="string">"select * from department where department.deleted_at = ? and department_id < ?"</span></span><br><span class="line"></span><br><span class="line"> <span class="regexp">//</span>withTrashed, 直接移除wheres中的第一个数组, </span><br><span class="line"> <span class="string">"select * from department where department_id < ?"</span></span><br><span class="line"></span><br><span class="line"> <span class="regexp">//</span>这里必须同时移除bindings数组中的第一个元素，否则执行的会是department_id<<span class="number">0</span></span><br><span class="line"></span><br></pre></td></tr></table></figure></p>
<p><font color="red">必须同时去掉软删除对应的where条件和bindings参数</font>最终修改结果如下:<br><figure class="highlight php"><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">remove</span><span class="params">(Builder $builder, Model $model)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> $column = $model->getQualifiedDeletedAtColumn();</span><br><span class="line"></span><br><span class="line"> $query = $builder->getQuery(); <span class="comment">//Database\Query\Builder</span></span><br><span class="line"></span><br><span class="line"> <span class="comment">//其实就是array_filter()实现 </span></span><br><span class="line"> $query->wheres = collect($query->wheres)->reject(<span class="function"><span class="keyword">function</span> <span class="params">($where)</span> <span class="title">use</span> <span class="params">($column, $query)</span> </span>{</span><br><span class="line"> <span class="comment">//遍历wheres查询条件，并去掉软删除对应条件和绑定的参数</span></span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">$this</span>->isSoftDeleteConstraint($where, $column, $query);</span><br><span class="line"> })->values()->all();</span><br><span class="line">}</span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">isSoftDeleteConstraint</span><span class="params">(array $where, $column, Query $query)</span></span></span><br><span class="line"><span class="function"></span>{ </span><br><span class="line"> $isSoft = $where[<span class="string">'value'</span>] === <span class="number">0</span> && $where[<span class="string">'column'</span>] == $column;</span><br><span class="line"> <span class="keyword">if</span>($isSoft){</span><br><span class="line"> $bindings = $query->getRawBindings()[<span class="string">'where'</span>];</span><br><span class="line"> array_shift($bindings);</span><br><span class="line"> <span class="comment">//重新设置where中的绑定数据</span></span><br><span class="line"> $query->setBindings($bindings);</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> $isSoft;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
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