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<h1>Source code for django.db.models.aggregates</h1><div class="highlight"><pre>
<span></span><span class="sd">"""</span>
<span class="sd">Classes to represent the definitions of aggregate functions.</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">django.core.exceptions</span> <span class="k">import</span> <span class="n">FieldError</span>
<span class="kn">from</span> <span class="nn">django.db.models.expressions</span> <span class="k">import</span> <span class="n">Func</span><span class="p">,</span> <span class="n">Star</span>
<span class="kn">from</span> <span class="nn">django.db.models.fields</span> <span class="k">import</span> <span class="n">DecimalField</span><span class="p">,</span> <span class="n">FloatField</span><span class="p">,</span> <span class="n">IntegerField</span>
<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span>
<span class="s1">'Aggregate'</span><span class="p">,</span> <span class="s1">'Avg'</span><span class="p">,</span> <span class="s1">'Count'</span><span class="p">,</span> <span class="s1">'Max'</span><span class="p">,</span> <span class="s1">'Min'</span><span class="p">,</span> <span class="s1">'StdDev'</span><span class="p">,</span> <span class="s1">'Sum'</span><span class="p">,</span> <span class="s1">'Variance'</span><span class="p">,</span>
<span class="p">]</span>
<div class="viewcode-block" id="Aggregate"><a class="viewcode-back" href="../../../../ref/models/expressions.html#django.db.models.Aggregate">[docs]</a><span class="k">class</span> <span class="nc">Aggregate</span><span class="p">(</span><span class="n">Func</span><span class="p">):</span>
<span class="n">contains_aggregate</span> <span class="o">=</span> <span class="kc">True</span>
<span class="n">name</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">def</span> <span class="nf">resolve_expression</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">query</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">allow_joins</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">reuse</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">summarize</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">for_save</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
<span class="c1"># Aggregates are not allowed in UPDATE queries, so ignore for_save</span>
<span class="n">c</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Aggregate</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">resolve_expression</span><span class="p">(</span><span class="n">query</span><span class="p">,</span> <span class="n">allow_joins</span><span class="p">,</span> <span class="n">reuse</span><span class="p">,</span> <span class="n">summarize</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">summarize</span><span class="p">:</span>
<span class="n">expressions</span> <span class="o">=</span> <span class="n">c</span><span class="o">.</span><span class="n">get_source_expressions</span><span class="p">()</span>
<span class="k">for</span> <span class="n">index</span><span class="p">,</span> <span class="n">expr</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">expressions</span><span class="p">):</span>
<span class="k">if</span> <span class="n">expr</span><span class="o">.</span><span class="n">contains_aggregate</span><span class="p">:</span>
<span class="n">before_resolved</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_source_expressions</span><span class="p">()[</span><span class="n">index</span><span class="p">]</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">before_resolved</span><span class="o">.</span><span class="n">name</span> <span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">before_resolved</span><span class="p">,</span> <span class="s1">'name'</span><span class="p">)</span> <span class="k">else</span> <span class="nb">repr</span><span class="p">(</span><span class="n">before_resolved</span><span class="p">)</span>
<span class="k">raise</span> <span class="n">FieldError</span><span class="p">(</span><span class="s2">"Cannot compute </span><span class="si">%s</span><span class="s2">('</span><span class="si">%s</span><span class="s2">'): '</span><span class="si">%s</span><span class="s2">' is an aggregate"</span> <span class="o">%</span> <span class="p">(</span><span class="n">c</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">name</span><span class="p">))</span>
<span class="k">return</span> <span class="n">c</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">default_alias</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">expressions</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_source_expressions</span><span class="p">()</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">expressions</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span> <span class="ow">and</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="s1">'name'</span><span class="p">):</span>
<span class="k">return</span> <span class="s1">'</span><span class="si">%s</span><span class="s1">__</span><span class="si">%s</span><span class="s1">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="o">.</span><span class="n">lower</span><span class="p">())</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s2">"Complex expressions require an alias"</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">get_group_by_cols</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="p">[]</span></div>
<div class="viewcode-block" id="Avg"><a class="viewcode-back" href="../../../../ref/models/querysets.html#django.db.models.Avg">[docs]</a><span class="k">class</span> <span class="nc">Avg</span><span class="p">(</span><span class="n">Aggregate</span><span class="p">):</span>
<span class="n">function</span> <span class="o">=</span> <span class="s1">'AVG'</span>
<span class="n">name</span> <span class="o">=</span> <span class="s1">'Avg'</span>
<span class="k">def</span> <span class="nf">_resolve_output_field</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">source_field</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_source_fields</span><span class="p">()[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source_field</span><span class="p">,</span> <span class="p">(</span><span class="n">IntegerField</span><span class="p">,</span> <span class="n">DecimalField</span><span class="p">)):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_output_field</span> <span class="o">=</span> <span class="n">FloatField</span><span class="p">()</span>
<span class="nb">super</span><span class="p">(</span><span class="n">Avg</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">_resolve_output_field</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">as_oracle</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">compiler</span><span class="p">,</span> <span class="n">connection</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">output_field</span><span class="o">.</span><span class="n">get_internal_type</span><span class="p">()</span> <span class="o">==</span> <span class="s1">'DurationField'</span><span class="p">:</span>
<span class="n">expression</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_source_expressions</span><span class="p">()[</span><span class="mi">0</span><span class="p">]</span>
<span class="kn">from</span> <span class="nn">django.db.backends.oracle.functions</span> <span class="k">import</span> <span class="n">IntervalToSeconds</span><span class="p">,</span> <span class="n">SecondsToInterval</span>
<span class="k">return</span> <span class="n">compiler</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span>
<span class="n">SecondsToInterval</span><span class="p">(</span><span class="n">Avg</span><span class="p">(</span><span class="n">IntervalToSeconds</span><span class="p">(</span><span class="n">expression</span><span class="p">)))</span>
<span class="p">)</span>
<span class="k">return</span> <span class="nb">super</span><span class="p">(</span><span class="n">Avg</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">as_sql</span><span class="p">(</span><span class="n">compiler</span><span class="p">,</span> <span class="n">connection</span><span class="p">)</span></div>
<div class="viewcode-block" id="Count"><a class="viewcode-back" href="../../../../ref/models/querysets.html#django.db.models.Count">[docs]</a><span class="k">class</span> <span class="nc">Count</span><span class="p">(</span><span class="n">Aggregate</span><span class="p">):</span>
<span class="n">function</span> <span class="o">=</span> <span class="s1">'COUNT'</span>
<span class="n">name</span> <span class="o">=</span> <span class="s1">'Count'</span>
<span class="n">template</span> <span class="o">=</span> <span class="s1">'</span><span class="si">%(function)s</span><span class="s1">(</span><span class="si">%(distinct)s%(expressions)s</span><span class="s1">)'</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">,</span> <span class="n">distinct</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="o">**</span><span class="n">extra</span><span class="p">):</span>
<span class="k">if</span> <span class="n">expression</span> <span class="o">==</span> <span class="s1">'*'</span><span class="p">:</span>
<span class="n">expression</span> <span class="o">=</span> <span class="n">Star</span><span class="p">()</span>
<span class="nb">super</span><span class="p">(</span><span class="n">Count</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span>
<span class="n">expression</span><span class="p">,</span> <span class="n">distinct</span><span class="o">=</span><span class="s1">'DISTINCT '</span> <span class="k">if</span> <span class="n">distinct</span> <span class="k">else</span> <span class="s1">''</span><span class="p">,</span> <span class="n">output_field</span><span class="o">=</span><span class="n">IntegerField</span><span class="p">(),</span> <span class="o">**</span><span class="n">extra</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">"</span><span class="si">{}</span><span class="s2">(</span><span class="si">{}</span><span class="s2">, distinct=</span><span class="si">{}</span><span class="s2">)"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">arg_joiner</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">arg</span><span class="p">)</span> <span class="k">for</span> <span class="n">arg</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">source_expressions</span><span class="p">),</span>
<span class="s1">'False'</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">extra</span><span class="p">[</span><span class="s1">'distinct'</span><span class="p">]</span> <span class="o">==</span> <span class="s1">''</span> <span class="k">else</span> <span class="s1">'True'</span><span class="p">,</span>
<span class="p">)</span>
<span class="k">def</span> <span class="nf">convert_value</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">expression</span><span class="p">,</span> <span class="n">connection</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="mi">0</span>
<span class="k">return</span> <span class="nb">int</span><span class="p">(</span><span class="n">value</span><span class="p">)</span></div>
<div class="viewcode-block" id="Max"><a class="viewcode-back" href="../../../../ref/models/querysets.html#django.db.models.Max">[docs]</a><span class="k">class</span> <span class="nc">Max</span><span class="p">(</span><span class="n">Aggregate</span><span class="p">):</span>
<span class="n">function</span> <span class="o">=</span> <span class="s1">'MAX'</span>
<span class="n">name</span> <span class="o">=</span> <span class="s1">'Max'</span></div>
<div class="viewcode-block" id="Min"><a class="viewcode-back" href="../../../../ref/models/querysets.html#django.db.models.Min">[docs]</a><span class="k">class</span> <span class="nc">Min</span><span class="p">(</span><span class="n">Aggregate</span><span class="p">):</span>
<span class="n">function</span> <span class="o">=</span> <span class="s1">'MIN'</span>
<span class="n">name</span> <span class="o">=</span> <span class="s1">'Min'</span></div>
<div class="viewcode-block" id="StdDev"><a class="viewcode-back" href="../../../../ref/models/querysets.html#django.db.models.StdDev">[docs]</a><span class="k">class</span> <span class="nc">StdDev</span><span class="p">(</span><span class="n">Aggregate</span><span class="p">):</span>
<span class="n">name</span> <span class="o">=</span> <span class="s1">'StdDev'</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">,</span> <span class="n">sample</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="o">**</span><span class="n">extra</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">function</span> <span class="o">=</span> <span class="s1">'STDDEV_SAMP'</span> <span class="k">if</span> <span class="n">sample</span> <span class="k">else</span> <span class="s1">'STDDEV_POP'</span>
<span class="nb">super</span><span class="p">(</span><span class="n">StdDev</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">output_field</span><span class="o">=</span><span class="n">FloatField</span><span class="p">(),</span> <span class="o">**</span><span class="n">extra</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">"</span><span class="si">{}</span><span class="s2">(</span><span class="si">{}</span><span class="s2">, sample=</span><span class="si">{}</span><span class="s2">)"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">arg_joiner</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">arg</span><span class="p">)</span> <span class="k">for</span> <span class="n">arg</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">source_expressions</span><span class="p">),</span>
<span class="s1">'False'</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">function</span> <span class="o">==</span> <span class="s1">'STDDEV_POP'</span> <span class="k">else</span> <span class="s1">'True'</span><span class="p">,</span>
<span class="p">)</span>
<span class="k">def</span> <span class="nf">convert_value</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">expression</span><span class="p">,</span> <span class="n">connection</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="n">value</span>
<span class="k">return</span> <span class="nb">float</span><span class="p">(</span><span class="n">value</span><span class="p">)</span></div>
<div class="viewcode-block" id="Sum"><a class="viewcode-back" href="../../../../ref/models/querysets.html#django.db.models.Sum">[docs]</a><span class="k">class</span> <span class="nc">Sum</span><span class="p">(</span><span class="n">Aggregate</span><span class="p">):</span>
<span class="n">function</span> <span class="o">=</span> <span class="s1">'SUM'</span>
<span class="n">name</span> <span class="o">=</span> <span class="s1">'Sum'</span>
<span class="k">def</span> <span class="nf">as_oracle</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">compiler</span><span class="p">,</span> <span class="n">connection</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">output_field</span><span class="o">.</span><span class="n">get_internal_type</span><span class="p">()</span> <span class="o">==</span> <span class="s1">'DurationField'</span><span class="p">:</span>
<span class="n">expression</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_source_expressions</span><span class="p">()[</span><span class="mi">0</span><span class="p">]</span>
<span class="kn">from</span> <span class="nn">django.db.backends.oracle.functions</span> <span class="k">import</span> <span class="n">IntervalToSeconds</span><span class="p">,</span> <span class="n">SecondsToInterval</span>
<span class="k">return</span> <span class="n">compiler</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span>
<span class="n">SecondsToInterval</span><span class="p">(</span><span class="n">Sum</span><span class="p">(</span><span class="n">IntervalToSeconds</span><span class="p">(</span><span class="n">expression</span><span class="p">)))</span>
<span class="p">)</span>
<span class="k">return</span> <span class="nb">super</span><span class="p">(</span><span class="n">Sum</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">as_sql</span><span class="p">(</span><span class="n">compiler</span><span class="p">,</span> <span class="n">connection</span><span class="p">)</span></div>
<div class="viewcode-block" id="Variance"><a class="viewcode-back" href="../../../../ref/models/querysets.html#django.db.models.Variance">[docs]</a><span class="k">class</span> <span class="nc">Variance</span><span class="p">(</span><span class="n">Aggregate</span><span class="p">):</span>
<span class="n">name</span> <span class="o">=</span> <span class="s1">'Variance'</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">,</span> <span class="n">sample</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="o">**</span><span class="n">extra</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">function</span> <span class="o">=</span> <span class="s1">'VAR_SAMP'</span> <span class="k">if</span> <span class="n">sample</span> <span class="k">else</span> <span class="s1">'VAR_POP'</span>
<span class="nb">super</span><span class="p">(</span><span class="n">Variance</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">output_field</span><span class="o">=</span><span class="n">FloatField</span><span class="p">(),</span> <span class="o">**</span><span class="n">extra</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">"</span><span class="si">{}</span><span class="s2">(</span><span class="si">{}</span><span class="s2">, sample=</span><span class="si">{}</span><span class="s2">)"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">arg_joiner</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">arg</span><span class="p">)</span> <span class="k">for</span> <span class="n">arg</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">source_expressions</span><span class="p">),</span>
<span class="s1">'False'</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">function</span> <span class="o">==</span> <span class="s1">'VAR_POP'</span> <span class="k">else</span> <span class="s1">'True'</span><span class="p">,</span>
<span class="p">)</span>
<span class="k">def</span> <span class="nf">convert_value</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">expression</span><span class="p">,</span> <span class="n">connection</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="n">value</span>
<span class="k">return</span> <span class="nb">float</span><span class="p">(</span><span class="n">value</span><span class="p">)</span></div>
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