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<h1>Source code for sqlobject.tests.test_NoneValuedResultItem</h1><div class="highlight"><pre>
<span></span><span class="c1"># Test that selectResults handle NULL values from, for example, outer joins.</span>
<span class="kn">from</span> <span class="nn">sqlobject</span> <span class="k">import</span> <span class="n">ForeignKey</span><span class="p">,</span> <span class="n">SQLObject</span><span class="p">,</span> <span class="n">StringCol</span><span class="p">,</span> <span class="n">sqlbuilder</span>
<span class="kn">from</span> <span class="nn">sqlobject.tests.dbtest</span> <span class="k">import</span> <span class="n">setupClass</span>
<div class="viewcode-block" id="SOTestComposer"><a class="viewcode-back" href="../../../api/sqlobject.tests.test_NoneValuedResultItem.html#sqlobject.tests.test_NoneValuedResultItem.SOTestComposer">[docs]</a><span class="k">class</span> <span class="nc">SOTestComposer</span><span class="p">(</span><span class="n">SQLObject</span><span class="p">):</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">StringCol</span><span class="p">()</span>
</div>
<div class="viewcode-block" id="SOTestWork"><a class="viewcode-back" href="../../../api/sqlobject.tests.test_NoneValuedResultItem.html#sqlobject.tests.test_NoneValuedResultItem.SOTestWork">[docs]</a><span class="k">class</span> <span class="nc">SOTestWork</span><span class="p">(</span><span class="n">SQLObject</span><span class="p">):</span>
<span class="k">class</span> <span class="nc">sqlmeta</span><span class="p">:</span>
<span class="n">idName</span> <span class="o">=</span> <span class="s2">"work_id"</span>
<span class="n">composer</span> <span class="o">=</span> <span class="n">ForeignKey</span><span class="p">(</span><span class="s1">'SOTestComposer'</span><span class="p">)</span>
<span class="n">title</span> <span class="o">=</span> <span class="n">StringCol</span><span class="p">()</span>
</div>
<div class="viewcode-block" id="test1"><a class="viewcode-back" href="../../../api/sqlobject.tests.test_NoneValuedResultItem.html#sqlobject.tests.test_NoneValuedResultItem.test1">[docs]</a><span class="k">def</span> <span class="nf">test1</span><span class="p">():</span>
<span class="n">setupClass</span><span class="p">([</span><span class="n">SOTestComposer</span><span class="p">,</span>
<span class="n">SOTestWork</span><span class="p">])</span>
<span class="n">c</span> <span class="o">=</span> <span class="n">SOTestComposer</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s1">'Mahler, Gustav'</span><span class="p">)</span>
<span class="n">w</span> <span class="o">=</span> <span class="n">SOTestWork</span><span class="p">(</span><span class="n">composer</span><span class="o">=</span><span class="n">c</span><span class="p">,</span> <span class="n">title</span><span class="o">=</span><span class="s1">'Symphony No. 9'</span><span class="p">)</span>
<span class="n">SOTestComposer</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s1">'Bruckner, Anton'</span><span class="p">)</span>
<span class="c1"># but don't add any works for Bruckner</span>
<span class="c1"># do a left join, a common use case that often involves NULL results</span>
<span class="n">s</span> <span class="o">=</span> <span class="n">SOTestWork</span><span class="o">.</span><span class="n">select</span><span class="p">(</span>
<span class="n">join</span><span class="o">=</span><span class="n">sqlbuilder</span><span class="o">.</span><span class="n">LEFTJOINOn</span><span class="p">(</span>
<span class="n">SOTestComposer</span><span class="p">,</span> <span class="n">SOTestWork</span><span class="p">,</span>
<span class="n">SOTestComposer</span><span class="o">.</span><span class="n">q</span><span class="o">.</span><span class="n">id</span> <span class="o">==</span> <span class="n">SOTestWork</span><span class="o">.</span><span class="n">q</span><span class="o">.</span><span class="n">composerID</span><span class="p">))</span>
<span class="k">assert</span> <span class="nb">tuple</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="o">==</span> <span class="p">(</span><span class="n">w</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
</pre></div></div>
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