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Relationship Configuration
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SQLAlchemy 1.2 Documentation
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Release: <span class="version-num">1.2.19</span>
| Release Date: April 15, 2019
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<h1>SQLAlchemy 1.2 Documentation</h1>
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<h3><a href="../index.html">SQLAlchemy 1.2 Documentation</a></h3>
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<a href="index.html" title="SQLAlchemy ORM">SQLAlchemy ORM</a>
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<li><span class="link-container"><a class="reference external" href="tutorial.html">Object Relational Tutorial</a></span></li>
<li><span class="link-container"><a class="reference external" href="mapper_config.html">Mapper Configuration</a></span></li>
<li class="selected"><span class="link-container"><strong>Relationship Configuration</strong><a class="paramlink headerlink reference internal" href="#">¶</a></span><ul>
<li><span class="link-container"><a class="reference external" href="basic_relationships.html">Basic Relationship Patterns</a></span></li>
<li><span class="link-container"><a class="reference external" href="self_referential.html">Adjacency List Relationships</a></span></li>
<li><span class="link-container"><a class="reference external" href="backref.html">Linking Relationships with Backref</a></span></li>
<li><span class="link-container"><a class="reference external" href="join_conditions.html">Configuring how Relationship Joins</a></span></li>
<li><span class="link-container"><a class="reference external" href="collections.html">Collection Configuration and Techniques</a></span></li>
<li><span class="link-container"><a class="reference external" href="relationship_persistence.html">Special Relationship Persistence Patterns</a></span></li>
<li><span class="link-container"><a class="reference external" href="relationship_api.html">Relationships API</a></span></li>
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<li><span class="link-container"><a class="reference external" href="loading_objects.html">Loading Objects</a></span></li>
<li><span class="link-container"><a class="reference external" href="session.html">Using the Session</a></span></li>
<li><span class="link-container"><a class="reference external" href="extending.html">Events and Internals</a></span></li>
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<span class="target" id="module-sqlalchemy.orm"></span><div class="section" id="relationship-configuration">
<span id="relationship-config-toplevel"></span><h1>Relationship Configuration<a class="headerlink" href="#relationship-configuration" title="Permalink to this headline">¶</a></h1>
<p>This section describes the <a class="reference internal" href="relationship_api.html#sqlalchemy.orm.relationship" title="sqlalchemy.orm.relationship"><code class="xref py py-func docutils literal notranslate"><span class="pre">relationship()</span></code></a> function and in depth discussion
of its usage. For an introduction to relationships, start with the
<a class="reference internal" href="tutorial.html"><span class="std std-ref">Object Relational Tutorial</span></a> and head into <a class="reference internal" href="tutorial.html#orm-tutorial-relationship"><span class="std std-ref">Building a Relationship</span></a>.</p>
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<li class="toctree-l1"><a class="reference internal" href="basic_relationships.html">Basic Relationship Patterns</a><ul>
<li class="toctree-l2"><a class="reference internal" href="basic_relationships.html#one-to-many">One To Many</a></li>
<li class="toctree-l2"><a class="reference internal" href="basic_relationships.html#many-to-one">Many To One</a></li>
<li class="toctree-l2"><a class="reference internal" href="basic_relationships.html#one-to-one">One To One</a></li>
<li class="toctree-l2"><a class="reference internal" href="basic_relationships.html#many-to-many">Many To Many</a></li>
<li class="toctree-l2"><a class="reference internal" href="basic_relationships.html#association-object">Association Object</a></li>
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<li class="toctree-l1"><a class="reference internal" href="self_referential.html">Adjacency List Relationships</a><ul>
<li class="toctree-l2"><a class="reference internal" href="self_referential.html#composite-adjacency-lists">Composite Adjacency Lists</a></li>
<li class="toctree-l2"><a class="reference internal" href="self_referential.html#self-referential-query-strategies">Self-Referential Query Strategies</a></li>
<li class="toctree-l2"><a class="reference internal" href="self_referential.html#configuring-self-referential-eager-loading">Configuring Self-Referential Eager Loading</a></li>
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<li class="toctree-l1"><a class="reference internal" href="backref.html">Linking Relationships with Backref</a><ul>
<li class="toctree-l2"><a class="reference internal" href="backref.html#backref-arguments">Backref Arguments</a></li>
<li class="toctree-l2"><a class="reference internal" href="backref.html#one-way-backrefs">One Way Backrefs</a></li>
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<li class="toctree-l1"><a class="reference internal" href="join_conditions.html">Configuring how Relationship Joins</a><ul>
<li class="toctree-l2"><a class="reference internal" href="join_conditions.html#handling-multiple-join-paths">Handling Multiple Join Paths</a></li>
<li class="toctree-l2"><a class="reference internal" href="join_conditions.html#specifying-alternate-join-conditions">Specifying Alternate Join Conditions</a></li>
<li class="toctree-l2"><a class="reference internal" href="join_conditions.html#creating-custom-foreign-conditions">Creating Custom Foreign Conditions</a></li>
<li class="toctree-l2"><a class="reference internal" href="join_conditions.html#using-custom-operators-in-join-conditions">Using custom operators in join conditions</a></li>
<li class="toctree-l2"><a class="reference internal" href="join_conditions.html#overlapping-foreign-keys">Overlapping Foreign Keys</a></li>
<li class="toctree-l2"><a class="reference internal" href="join_conditions.html#non-relational-comparisons-materialized-path">Non-relational Comparisons / Materialized Path</a></li>
<li class="toctree-l2"><a class="reference internal" href="join_conditions.html#self-referential-many-to-many-relationship">Self-Referential Many-to-Many Relationship</a></li>
<li class="toctree-l2"><a class="reference internal" href="join_conditions.html#composite-secondary-joins">Composite “Secondary” Joins</a></li>
<li class="toctree-l2"><a class="reference internal" href="join_conditions.html#relationship-to-non-primary-mapper">Relationship to Non Primary Mapper</a></li>
<li class="toctree-l2"><a class="reference internal" href="join_conditions.html#row-limited-relationships-with-window-functions">Row-Limited Relationships with Window Functions</a></li>
<li class="toctree-l2"><a class="reference internal" href="join_conditions.html#building-query-enabled-properties">Building Query-Enabled Properties</a></li>
</ul>
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<li class="toctree-l1"><a class="reference internal" href="collections.html">Collection Configuration and Techniques</a><ul>
<li class="toctree-l2"><a class="reference internal" href="collections.html#working-with-large-collections">Working with Large Collections</a></li>
<li class="toctree-l2"><a class="reference internal" href="collections.html#customizing-collection-access">Customizing Collection Access</a></li>
<li class="toctree-l2"><a class="reference internal" href="collections.html#custom-collection-implementations">Custom Collection Implementations</a></li>
<li class="toctree-l2"><a class="reference internal" href="collections.html#collection-internals">Collection Internals</a></li>
</ul>
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<li class="toctree-l1"><a class="reference internal" href="relationship_persistence.html">Special Relationship Persistence Patterns</a><ul>
<li class="toctree-l2"><a class="reference internal" href="relationship_persistence.html#rows-that-point-to-themselves-mutually-dependent-rows">Rows that point to themselves / Mutually Dependent Rows</a></li>
<li class="toctree-l2"><a class="reference internal" href="relationship_persistence.html#mutable-primary-keys-update-cascades">Mutable Primary Keys / Update Cascades</a></li>
</ul>
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<li class="toctree-l1"><a class="reference internal" href="relationship_api.html">Relationships API</a></li>
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