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<div class="section" id="testing-when-using-django">
<h1>Testing when using django<a class="headerlink" href="#testing-when-using-django" title="Permalink to this headline">ΒΆ</a></h1>
<p>Django’s ORM has an unfortunate implementation choice to consider
<a class="reference external" href="https://docs.djangoproject.com/en/1.10/ref/models/instances.html#django.db.models.Model" title="(in Django v1.10)"><code class="xref py py-class docutils literal"><span class="pre">Model</span></code></a> instances to be identical as long as their
primary keys are the same:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">testfixtures.tests.test_django.models</span> <span class="k">import</span> <span class="n">SampleModel</span>
<span class="gp">>>> </span><span class="n">SampleModel</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span> <span class="o">==</span> <span class="n">SampleModel</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span>
<span class="go">True</span>
</pre></div>
</div>
<p>To work around this, <a class="reference internal" href="api.html#module-testfixtures.django" title="testfixtures.django"><code class="xref py py-mod docutils literal"><span class="pre">testfixtures.django</span></code></a> <a class="reference internal" href="comparing.html#comparer-register"><span class="std std-ref">registers</span></a>
a comparer for the django <a class="reference external" href="https://docs.djangoproject.com/en/1.10/ref/models/instances.html#django.db.models.Model" title="(in Django v1.10)"><code class="xref py py-class docutils literal"><span class="pre">Model</span></code></a> class. However,
for this to work, <code class="docutils literal"><span class="pre">ignore_eq=True</span></code> must be passed:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">compare</span><span class="p">(</span><span class="n">SampleModel</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span> <span class="n">SampleModel</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="mi">2</span><span class="p">),</span>
<span class="gp">... </span> <span class="n">ignore_eq</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">AssertionError</span>: <span class="n">SampleModel not as expected:</span>
<span class="go">same:</span>
<span class="go">[u'id']</span>
<span class="go">values differ:</span>
<span class="go">'value': 1 != 2</span>
</pre></div>
</div>
<p>Since the above can quickly become cumbersome, a django-specific version
of <a class="reference internal" href="api.html#testfixtures.compare" title="testfixtures.compare"><code class="xref py py-func docutils literal"><span class="pre">compare()</span></code></a>, with ignoring <code class="docutils literal"><span class="pre">__eq__</span></code> built in, is provided:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">testfixtures.django</span> <span class="k">import</span> <span class="n">compare</span> <span class="k">as</span> <span class="n">django_compare</span>
<span class="gp">>>> </span><span class="n">django_compare</span><span class="p">(</span><span class="n">SampleModel</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span> <span class="n">SampleModel</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="mi">2</span><span class="p">))</span>
<span class="gt">Traceback (most recent call last):</span>
<span class="c">...</span>
<span class="gr">AssertionError</span>: <span class="n">SampleModel not as expected:</span>
<span class="go">same:</span>
<span class="go">[u'id']</span>
<span class="go">values differ:</span>
<span class="go">'value': 1 != 2</span>
</pre></div>
</div>
<p>It may also be that you want to ignore fields over which you have no control
and cannot easily mock, such as created or modified times. For this, you
can use the <cite>ignore_fields</cite> option:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">compare</span><span class="p">(</span><span class="n">SampleModel</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="mi">1</span><span class="p">),</span> <span class="n">SampleModel</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="mi">2</span><span class="p">),</span>
<span class="gp">... </span> <span class="n">ignore_eq</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">ignore_fields</span><span class="o">=</span><span class="p">[</span><span class="s1">'value'</span><span class="p">])</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The implementation of the comparer for
<a class="reference external" href="https://docs.djangoproject.com/en/1.10/ref/models/instances.html#django.db.models.Model" title="(in Django v1.10)"><code class="xref py py-class docutils literal"><span class="pre">Model</span></code></a> instances ignores fields
that have <code class="docutils literal"><span class="pre">editable</span></code> set to <code class="docutils literal"><span class="pre">False</span></code>.</p>
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