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<h1>SQLAlchemy 0.9 Documentation</h1>
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<h1>Source code for examples.generic_associations.table_per_association</h1><div class="highlight"><pre>
<span class="sd">"""table_per_association.py</span>
<span class="sd">Illustrates a mixin which provides a generic association</span>
<span class="sd">via a individually generated association tables for each parent class.</span>
<span class="sd">The associated objects themselves are persisted in a single table</span>
<span class="sd">shared among all parents.</span>
<span class="sd">This configuration has the advantage that all Address</span>
<span class="sd">rows are in one table, so that the definition of "Address"</span>
<span class="sd">can be maintained in one place. The association table</span>
<span class="sd">contains the foreign key to Address so that Address</span>
<span class="sd">has no dependency on the system.</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">sqlalchemy.ext.declarative</span> <span class="kn">import</span> <span class="n">as_declarative</span><span class="p">,</span> <span class="n">declared_attr</span>
<span class="kn">from</span> <span class="nn">sqlalchemy</span> <span class="kn">import</span> <span class="n">create_engine</span><span class="p">,</span> <span class="n">Integer</span><span class="p">,</span> <span class="n">Column</span><span class="p">,</span> \
<span class="n">String</span><span class="p">,</span> <span class="n">ForeignKey</span><span class="p">,</span> <span class="n">Table</span>
<span class="kn">from</span> <span class="nn">sqlalchemy.orm</span> <span class="kn">import</span> <span class="n">Session</span><span class="p">,</span> <span class="n">relationship</span>
<span class="nd">@as_declarative</span><span class="p">()</span>
<span class="k">class</span> <span class="nc">Base</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""Base class which provides automated table name</span>
<span class="sd"> and surrogate primary key column.</span>
<span class="sd"> """</span>
<span class="nd">@declared_attr</span>
<span class="k">def</span> <span class="nf">__tablename__</span><span class="p">(</span><span class="n">cls</span><span class="p">):</span>
<span class="k">return</span> <span class="n">cls</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="nb">id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">primary_key</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Address</span><span class="p">(</span><span class="n">Base</span><span class="p">):</span>
<span class="sd">"""The Address class.</span>
<span class="sd"> This represents all address records in a</span>
<span class="sd"> single table.</span>
<span class="sd"> """</span>
<span class="n">street</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">)</span>
<span class="n">city</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">)</span>
<span class="nb">zip</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</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="s">"</span><span class="si">%s</span><span class="s">(street=</span><span class="si">%r</span><span class="s">, city=</span><span class="si">%r</span><span class="s">, zip=</span><span class="si">%r</span><span class="s">)"</span> <span class="o">%</span> \
<span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">__class__</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">street</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">city</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">zip</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">HasAddresses</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""HasAddresses mixin, creates a new address_association</span>
<span class="sd"> table for each parent.</span>
<span class="sd"> """</span>
<span class="nd">@declared_attr</span>
<span class="k">def</span> <span class="nf">addresses</span><span class="p">(</span><span class="n">cls</span><span class="p">):</span>
<span class="n">address_association</span> <span class="o">=</span> <span class="n">Table</span><span class="p">(</span>
<span class="s">"</span><span class="si">%s</span><span class="s">_addresses"</span> <span class="o">%</span> <span class="n">cls</span><span class="o">.</span><span class="n">__tablename__</span><span class="p">,</span>
<span class="n">cls</span><span class="o">.</span><span class="n">metadata</span><span class="p">,</span>
<span class="n">Column</span><span class="p">(</span><span class="s">"address_id"</span><span class="p">,</span> <span class="n">ForeignKey</span><span class="p">(</span><span class="s">"address.id"</span><span class="p">),</span>
<span class="n">primary_key</span><span class="o">=</span><span class="bp">True</span><span class="p">),</span>
<span class="n">Column</span><span class="p">(</span><span class="s">"</span><span class="si">%s</span><span class="s">_id"</span> <span class="o">%</span> <span class="n">cls</span><span class="o">.</span><span class="n">__tablename__</span><span class="p">,</span>
<span class="n">ForeignKey</span><span class="p">(</span><span class="s">"</span><span class="si">%s</span><span class="s">.id"</span> <span class="o">%</span> <span class="n">cls</span><span class="o">.</span><span class="n">__tablename__</span><span class="p">),</span>
<span class="n">primary_key</span><span class="o">=</span><span class="bp">True</span><span class="p">),</span>
<span class="p">)</span>
<span class="k">return</span> <span class="n">relationship</span><span class="p">(</span><span class="n">Address</span><span class="p">,</span> <span class="n">secondary</span><span class="o">=</span><span class="n">address_association</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Customer</span><span class="p">(</span><span class="n">HasAddresses</span><span class="p">,</span> <span class="n">Base</span><span class="p">):</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">Supplier</span><span class="p">(</span><span class="n">HasAddresses</span><span class="p">,</span> <span class="n">Base</span><span class="p">):</span>
<span class="n">company_name</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">)</span>
<span class="n">engine</span> <span class="o">=</span> <span class="n">create_engine</span><span class="p">(</span><span class="s">'sqlite://'</span><span class="p">,</span> <span class="n">echo</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">Base</span><span class="o">.</span><span class="n">metadata</span><span class="o">.</span><span class="n">create_all</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>
<span class="n">session</span> <span class="o">=</span> <span class="n">Session</span><span class="p">(</span><span class="n">engine</span><span class="p">)</span>
<span class="n">session</span><span class="o">.</span><span class="n">add_all</span><span class="p">([</span>
<span class="n">Customer</span><span class="p">(</span>
<span class="n">name</span><span class="o">=</span><span class="s">'customer 1'</span><span class="p">,</span>
<span class="n">addresses</span><span class="o">=</span><span class="p">[</span>
<span class="n">Address</span><span class="p">(</span>
<span class="n">street</span><span class="o">=</span><span class="s">'123 anywhere street'</span><span class="p">,</span>
<span class="n">city</span><span class="o">=</span><span class="s">"New York"</span><span class="p">,</span>
<span class="nb">zip</span><span class="o">=</span><span class="s">"10110"</span><span class="p">),</span>
<span class="n">Address</span><span class="p">(</span>
<span class="n">street</span><span class="o">=</span><span class="s">'40 main street'</span><span class="p">,</span>
<span class="n">city</span><span class="o">=</span><span class="s">"San Francisco"</span><span class="p">,</span>
<span class="nb">zip</span><span class="o">=</span><span class="s">"95732"</span><span class="p">)</span>
<span class="p">]</span>
<span class="p">),</span>
<span class="n">Supplier</span><span class="p">(</span>
<span class="n">company_name</span><span class="o">=</span><span class="s">"Ace Hammers"</span><span class="p">,</span>
<span class="n">addresses</span><span class="o">=</span><span class="p">[</span>
<span class="n">Address</span><span class="p">(</span>
<span class="n">street</span><span class="o">=</span><span class="s">'2569 west elm'</span><span class="p">,</span>
<span class="n">city</span><span class="o">=</span><span class="s">"Detroit"</span><span class="p">,</span>
<span class="nb">zip</span><span class="o">=</span><span class="s">"56785"</span><span class="p">)</span>
<span class="p">]</span>
<span class="p">),</span>
<span class="p">])</span>
<span class="n">session</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span>
<span class="k">for</span> <span class="n">customer</span> <span class="ow">in</span> <span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">Customer</span><span class="p">):</span>
<span class="k">for</span> <span class="n">address</span> <span class="ow">in</span> <span class="n">customer</span><span class="o">.</span><span class="n">addresses</span><span class="p">:</span>
<span class="k">print</span><span class="p">(</span><span class="n">address</span><span class="p">)</span>
<span class="c"># no parent here</span></pre></div>
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