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<title>related Field has invalid lookup: icontains 解决方法 · Tugqi Biz
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<h1><a href="http://wbowam.github.io/related-field-has-invalid-lookup-icontains-jie-jue-fang-fa.html"> related Field has invalid lookup: icontains 解决方法 </a></h1>
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<p>这种错误常见于： </p>
<h5 id="1">1. 后台查询部分，如：<a class="headerlink" href="#1" title="Permanent link">¶</a></h5>
<div class="highlight"><pre><span class="cp"># 有一个表Category是表Article的category外键，Category有属性叫name，</span>
<span class="n">class</span> <span class="n">ArticleAdmin</span><span class="p">(</span><span class="n">admin</span><span class="p">.</span><span class="n">ModelAdmin</span><span class="p">)</span><span class="o">:</span>
<span class="s">"""</span>
<span class="n">A</span> <span class="n">simple</span> <span class="n">AdminModel</span> <span class="k">for</span> <span class="n">Article</span><span class="p">.</span>
<span class="s">"""</span>
<span class="n">search_fields</span> <span class="o">=</span> <span class="p">(</span><span class="err">'</span><span class="n">title</span><span class="err">'</span><span class="p">,</span> <span class="err">'</span><span class="n">category</span><span class="err">'</span><span class="p">)</span>
</pre></div>
<p>以上情况下肯定会报一个<code>related Field has invalid lookup: icontains</code>错误 </p>
<h5 id="2">2. 你在其他地方写了查询语句，如以下函数：<a class="headerlink" href="#2" title="Permanent link">¶</a></h5>
<div class="highlight"><pre><span class="err">@</span><span class="n">classmethod</span>
<span class="n">def</span> <span class="n">get_articles</span><span class="p">(</span><span class="n">cls</span><span class="p">,</span> <span class="n">CATEGORY</span><span class="o">=</span><span class="n">None</span><span class="p">,</span> <span class="n">TAG</span><span class="o">=</span><span class="n">None</span><span class="p">,</span> <span class="n">NUM</span><span class="o">=</span><span class="mi">100</span><span class="p">)</span><span class="o">:</span>
<span class="s">"""</span>
<span class="n">A</span> <span class="n">simple</span> <span class="n">classmethod</span><span class="p">.</span>
<span class="n">Use</span> <span class="n">Article</span><span class="p">.</span><span class="n">get_articles</span><span class="p">(</span><span class="n">CATEGORY</span><span class="o">=</span><span class="n">None</span><span class="p">,</span> <span class="n">TAG</span><span class="o">=</span><span class="n">None</span><span class="p">,</span> <span class="n">NUM</span><span class="o">=</span><span class="mi">100</span><span class="p">)</span> <span class="n">to</span> <span class="n">get</span> <span class="n">articles</span> <span class="n">list</span><span class="p">.</span>
<span class="s">"""</span>
<span class="k">if</span> <span class="n">CATEGORY</span><span class="o">:</span>
<span class="n">article_list</span> <span class="o">=</span> <span class="n">cls</span><span class="p">.</span><span class="n">objects</span><span class="p">.</span><span class="n">filter</span><span class="p">(</span>
<span class="n">Q</span><span class="p">(</span><span class="n">status</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span> <span class="o">&</span> <span class="n">Q</span><span class="p">(</span><span class="n">category__icontains</span><span class="o">=</span><span class="n">CATEGORY</span><span class="p">))[</span><span class="o">:</span><span class="n">NUM</span><span class="p">]</span>
<span class="k">return</span> <span class="n">article_list</span>
<span class="k">return</span> <span class="n">cls</span><span class="p">.</span><span class="n">objects</span><span class="p">.</span><span class="n">filter</span><span class="p">(</span><span class="n">status</span><span class="o">=</span><span class="mi">0</span><span class="p">)[</span><span class="o">:</span><span class="n">NUM</span><span class="p">]</span>
</pre></div>
<p>如上第二个Q查询里。</p>
<h4 id="_1">以上两种情况原因都是一样的：设置搜索范围，如果有外键，要注明外键的哪个字段，双下划线。<a class="headerlink" href="#_1" title="Permanent link">¶</a></h4>
<div class="highlight"><pre><span class="n">class</span> <span class="n">ArticleAdmin</span><span class="p">(</span><span class="n">admin</span><span class="p">.</span><span class="n">ModelAdmin</span><span class="p">)</span><span class="o">:</span>
<span class="s">"""</span>
<span class="n">A</span> <span class="n">simple</span> <span class="n">AdminModel</span> <span class="k">for</span> <span class="n">Article</span><span class="p">.</span>
<span class="s">"""</span>
<span class="n">search_fields</span> <span class="o">=</span> <span class="p">(</span><span class="err">'</span><span class="n">title</span><span class="err">'</span><span class="p">,</span> <span class="err">'</span><span class="n">category__name</span><span class="err">'</span><span class="p">)</span>
</pre></div>
<div class="highlight"><pre><span class="err">@</span><span class="n">classmethod</span>
<span class="n">def</span> <span class="n">get_articles</span><span class="p">(</span><span class="n">cls</span><span class="p">,</span> <span class="n">CATEGORY</span><span class="o">=</span><span class="n">None</span><span class="p">,</span> <span class="n">TAG</span><span class="o">=</span><span class="n">None</span><span class="p">,</span> <span class="n">NUM</span><span class="o">=</span><span class="mi">100</span><span class="p">)</span><span class="o">:</span>
<span class="s">"""</span>
<span class="n">A</span> <span class="n">simple</span> <span class="n">classmethod</span><span class="p">.</span>
<span class="n">Use</span> <span class="n">Article</span><span class="p">.</span><span class="n">get_articles</span><span class="p">(</span><span class="n">CATEGORY</span><span class="o">=</span><span class="n">None</span><span class="p">,</span> <span class="n">TAG</span><span class="o">=</span><span class="n">None</span><span class="p">,</span> <span class="n">NUM</span><span class="o">=</span><span class="mi">100</span><span class="p">)</span> <span class="n">to</span> <span class="n">get</span> <span class="n">articles</span> <span class="n">list</span><span class="p">.</span>
<span class="s">"""</span>
<span class="k">if</span> <span class="n">CATEGORY</span><span class="o">:</span>
<span class="n">article_list</span> <span class="o">=</span> <span class="n">cls</span><span class="p">.</span><span class="n">objects</span><span class="p">.</span><span class="n">filter</span><span class="p">(</span>
<span class="n">Q</span><span class="p">(</span><span class="n">status</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span> <span class="o">&</span> <span class="n">Q</span><span class="p">(</span><span class="n">category__name__icontains</span><span class="o">=</span><span class="n">CATEGORY</span><span class="p">))[</span><span class="o">:</span><span class="n">NUM</span><span class="p">]</span>
<span class="k">return</span> <span class="n">article_list</span>
<span class="k">return</span> <span class="n">cls</span><span class="p">.</span><span class="n">objects</span><span class="p">.</span><span class="n">filter</span><span class="p">(</span><span class="n">status</span><span class="o">=</span><span class="mi">0</span><span class="p">)[</span><span class="o">:</span><span class="n">NUM</span><span class="p">]</span>
</pre></div>
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