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222 lines
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HTML
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<title>Patterns for Flask — Flask Documentation (3.2.x)</title>
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accesskey="I">index</a></li>
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<li class="nav-item nav-item-this"><a href="">Patterns for Flask</a></li>
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<section id="patterns-for-flask">
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<h1>Patterns for Flask<a class="headerlink" href="#patterns-for-flask" title="Link to this heading">¶</a></h1>
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<p>Certain features and interactions are common enough that you will find
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them in most web applications. For example, many applications use a
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relational database and user authentication. They will open a database
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connection at the beginning of the request and get the information for
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the logged in user. At the end of the request, the database connection
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is closed.</p>
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<p>These types of patterns may be a bit outside the scope of Flask itself,
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but Flask makes it easy to implement them. Some common patterns are
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collected in the following pages.</p>
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<div class="toctree-wrapper compound">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="packages.html">Large Applications as Packages</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="packages.html#simple-packages">Simple Packages</a></li>
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<li class="toctree-l2"><a class="reference internal" href="packages.html#working-with-blueprints">Working with Blueprints</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="appfactories.html">Application Factories</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="appfactories.html#basic-factories">Basic Factories</a></li>
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<li class="toctree-l2"><a class="reference internal" href="appfactories.html#factories-extensions">Factories & Extensions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="appfactories.html#using-applications">Using Applications</a></li>
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<li class="toctree-l2"><a class="reference internal" href="appfactories.html#factory-improvements">Factory Improvements</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="appdispatch.html">Application Dispatching</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="appdispatch.html#working-with-this-document">Working with this Document</a></li>
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<li class="toctree-l2"><a class="reference internal" href="appdispatch.html#combining-applications">Combining Applications</a></li>
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<li class="toctree-l2"><a class="reference internal" href="appdispatch.html#dispatch-by-subdomain">Dispatch by Subdomain</a></li>
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<li class="toctree-l2"><a class="reference internal" href="appdispatch.html#dispatch-by-path">Dispatch by Path</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="urlprocessors.html">Using URL Processors</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="urlprocessors.html#internationalized-application-urls">Internationalized Application URLs</a></li>
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<li class="toctree-l2"><a class="reference internal" href="urlprocessors.html#internationalized-blueprint-urls">Internationalized Blueprint URLs</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="sqlite3.html">Using SQLite 3 with Flask</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="sqlite3.html#connect-on-demand">Connect on Demand</a></li>
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<li class="toctree-l2"><a class="reference internal" href="sqlite3.html#easy-querying">Easy Querying</a></li>
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<li class="toctree-l2"><a class="reference internal" href="sqlite3.html#initial-schemas">Initial Schemas</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="sqlalchemy.html">SQLAlchemy in Flask</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="sqlalchemy.html#flask-sqlalchemy-extension">Flask-SQLAlchemy Extension</a></li>
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<li class="toctree-l2"><a class="reference internal" href="sqlalchemy.html#declarative">Declarative</a></li>
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<li class="toctree-l2"><a class="reference internal" href="sqlalchemy.html#manual-object-relational-mapping">Manual Object Relational Mapping</a></li>
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<li class="toctree-l2"><a class="reference internal" href="sqlalchemy.html#sql-abstraction-layer">SQL Abstraction Layer</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="fileuploads.html">Uploading Files</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="fileuploads.html#a-gentle-introduction">A Gentle Introduction</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fileuploads.html#improving-uploads">Improving Uploads</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fileuploads.html#upload-progress-bars">Upload Progress Bars</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fileuploads.html#an-easier-solution">An Easier Solution</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="caching.html">Caching</a></li>
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<li class="toctree-l1"><a class="reference internal" href="viewdecorators.html">View Decorators</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="viewdecorators.html#login-required-decorator">Login Required Decorator</a></li>
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<li class="toctree-l2"><a class="reference internal" href="viewdecorators.html#caching-decorator">Caching Decorator</a></li>
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<li class="toctree-l2"><a class="reference internal" href="viewdecorators.html#templating-decorator">Templating Decorator</a></li>
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<li class="toctree-l2"><a class="reference internal" href="viewdecorators.html#endpoint-decorator">Endpoint Decorator</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="wtforms.html">Form Validation with WTForms</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="wtforms.html#the-forms">The Forms</a></li>
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<li class="toctree-l2"><a class="reference internal" href="wtforms.html#in-the-view">In the View</a></li>
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<li class="toctree-l2"><a class="reference internal" href="wtforms.html#forms-in-templates">Forms in Templates</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="templateinheritance.html">Template Inheritance</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="templateinheritance.html#base-template">Base Template</a></li>
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<li class="toctree-l2"><a class="reference internal" href="templateinheritance.html#child-template">Child Template</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="flashing.html">Message Flashing</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="flashing.html#simple-flashing">Simple Flashing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="flashing.html#flashing-with-categories">Flashing With Categories</a></li>
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<li class="toctree-l2"><a class="reference internal" href="flashing.html#filtering-flash-messages">Filtering Flash Messages</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="javascript.html">JavaScript, <code class="docutils literal notranslate"><span class="pre">fetch</span></code>, and JSON</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="javascript.html#rendering-templates">Rendering Templates</a></li>
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<li class="toctree-l2"><a class="reference internal" href="javascript.html#generating-urls">Generating URLs</a></li>
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<li class="toctree-l2"><a class="reference internal" href="javascript.html#making-a-request-with-fetch">Making a Request with <code class="docutils literal notranslate"><span class="pre">fetch</span></code></a></li>
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<li class="toctree-l2"><a class="reference internal" href="javascript.html#following-redirects">Following Redirects</a></li>
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<li class="toctree-l2"><a class="reference internal" href="javascript.html#replacing-content">Replacing Content</a></li>
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<li class="toctree-l2"><a class="reference internal" href="javascript.html#return-json-from-views">Return JSON from Views</a></li>
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<li class="toctree-l2"><a class="reference internal" href="javascript.html#receiving-json-in-views">Receiving JSON in Views</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="lazyloading.html">Lazily Loading Views</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="lazyloading.html#converting-to-centralized-url-map">Converting to Centralized URL Map</a></li>
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<li class="toctree-l2"><a class="reference internal" href="lazyloading.html#loading-late">Loading Late</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="mongoengine.html">MongoDB with MongoEngine</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="mongoengine.html#configuration">Configuration</a></li>
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<li class="toctree-l2"><a class="reference internal" href="mongoengine.html#mapping-documents">Mapping Documents</a></li>
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<li class="toctree-l2"><a class="reference internal" href="mongoengine.html#creating-data">Creating Data</a></li>
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<li class="toctree-l2"><a class="reference internal" href="mongoengine.html#queries">Queries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="mongoengine.html#documentation">Documentation</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="favicon.html">Adding a favicon</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="favicon.html#see-also">See also</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="streaming.html">Streaming Contents</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="streaming.html#basic-usage">Basic Usage</a></li>
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<li class="toctree-l2"><a class="reference internal" href="streaming.html#streaming-from-templates">Streaming from Templates</a></li>
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<li class="toctree-l2"><a class="reference internal" href="streaming.html#streaming-with-context">Streaming with Context</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="deferredcallbacks.html">Deferred Request Callbacks</a></li>
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<li class="toctree-l1"><a class="reference internal" href="methodoverrides.html">Adding HTTP Method Overrides</a></li>
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<li class="toctree-l1"><a class="reference internal" href="requestchecksum.html">Request Content Checksums</a></li>
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<li class="toctree-l1"><a class="reference internal" href="celery.html">Background Tasks with Celery</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="celery.html#install">Install</a></li>
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<li class="toctree-l2"><a class="reference internal" href="celery.html#integrate-celery-with-flask">Integrate Celery with Flask</a></li>
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<li class="toctree-l2"><a class="reference internal" href="celery.html#application-factory">Application Factory</a></li>
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<li class="toctree-l2"><a class="reference internal" href="celery.html#defining-tasks">Defining Tasks</a></li>
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<li class="toctree-l2"><a class="reference internal" href="celery.html#calling-tasks">Calling Tasks</a></li>
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<li class="toctree-l2"><a class="reference internal" href="celery.html#getting-results">Getting Results</a></li>
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<li class="toctree-l2"><a class="reference internal" href="celery.html#passing-data-to-tasks">Passing Data to Tasks</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="subclassing.html">Subclassing Flask</a></li>
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<li class="toctree-l1"><a class="reference internal" href="singlepageapplications.html">Single-Page Applications</a></li>
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</ul>
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</div>
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</section>
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