vapor-docs/build/3.0/fluent/getting-started/index.html

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<div class="md-content">
<article class="md-content__inner md-typeset">
<a href="https://github.com/vapor/documentation/edit/beta/3.0/docs/fluent/getting-started.md" title="Edit this page" class="md-icon md-content__icon">&#xE3C9;</a>
<h1 id="adding-fluent-to-your-project">Adding Fluent to your Project<a class="headerlink" href="#adding-fluent-to-your-project" title="Permanent link">&para;</a></h1>
<p>Fluent (<a href="https://github.com/vapor/fluent">vapor/fluent</a>) is a type-safe, fast, and easy-to-use ORM built for Swift.
It takes advantage of Swift's strong type system to provide an elegant API for your database.</p>
<h2 id="database">Database<a class="headerlink" href="#database" title="Permanent link">&para;</a></h2>
<p>In addition to adding Fluent to your project, you must also add a Fluent compatible database.
Fluent does not include any databases by default. All official databases have a getting started guide similar to this one.</p>
<table>
<thead>
<tr>
<th>database</th>
<th>library</th>
<th>driver</th>
<th>guide</th>
</tr>
</thead>
<tbody>
<tr>
<td>PostgreSQL</td>
<td>vapor/postgres</td>
<td>vapor/fluent-postgres</td>
<td><a href="../../databases/postgres/getting-started.md">PostgreSQL &rarr; Package</a></td>
</tr>
<tr>
<td>MySQL</td>
<td>vapor/mysql</td>
<td>vapor/fluent-mysql</td>
<td><a href="../../databases/mysql/getting-started.md">MySQL &rarr; Package</a></td>
</tr>
<tr>
<td>SQLite</td>
<td>vapor/sqlite</td>
<td>vapor/fluent-sqlite</td>
<td><a href="../../databases/sqlite/getting-started.md">SQLite &rarr; Package</a></td>
</tr>
<tr>
<td>MongoDB</td>
<td>mongokitten/mongokitten</td>
<td>vapor/fluent-mongokitten</td>
<td><a href="http://github.com/vapor/fluent-mongokitten/readme.md">README.md</a></td>
</tr>
</tbody>
</table>
<div class="admonition tip">
<p class="admonition-title">Tip</p>
<p>Any database can be made to work with Fluent by conforming to its <a href="../database/">Database</a> protocol.
For a list of all compatible database types, search GitHub for the <a href="https://github.com/topics/fluent-driver">fluent-driver</a> topic.</p>
</div>
<h2 id="fluent">Fluent<a class="headerlink" href="#fluent" title="Permanent link">&para;</a></h2>
<p>After you have added your database driver, simply add the Fluent package to your Package manifest.</p>
<div class="codehilite"><pre><span></span><span class="c1">// swift-tools-version:4.0</span>
<span class="kd">import</span> <span class="nc">PackageDescription</span>
<span class="kd">let</span> <span class="nv">package</span> <span class="p">=</span> <span class="n">Package</span><span class="p">(</span>
<span class="n">name</span><span class="p">:</span> <span class="s">&quot;Project&quot;</span><span class="p">,</span>
<span class="n">dependencies</span><span class="p">:</span> <span class="p">[</span>
<span class="p">...</span>
<span class="p">.</span><span class="n">package</span><span class="p">(</span><span class="n">url</span><span class="p">:</span> <span class="s">&quot;https://github.com/vapor/fluent.git&quot;</span><span class="p">,</span> <span class="p">.</span><span class="n">upToNextMajor</span><span class="p">(</span><span class="n">from</span><span class="p">:</span> <span class="s">&quot;3.0.0&quot;</span><span class="p">)),</span>
<span class="p">],</span>
<span class="n">targets</span><span class="p">:</span> <span class="p">[</span>
<span class="p">.</span><span class="n">target</span><span class="p">(</span><span class="n">name</span><span class="p">:</span> <span class="s">&quot;Project&quot;</span><span class="p">,</span> <span class="n">dependencies</span><span class="p">:</span> <span class="p">[</span><span class="s">&quot;Fluent&quot;</span><span class="p">,</span> <span class="p">...</span> <span class="p">])</span>
<span class="p">]</span>
<span class="p">)</span>
</pre></div>
<p>If this is your first time adding a dependency, you should read our introduction to <a href="../../getting-started/spm.md">Package.swift</a>.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Use <code>import Fluent</code> to access Fluent's APIs.</p>
</div>
<p>Once you have Fluent added to your project, you are ready to configure your database(s).</p>
<h2 id="configuring-fluent">Configuring Fluent<a class="headerlink" href="#configuring-fluent" title="Permanent link">&para;</a></h2>
<p>Fluent integrates seamlessly into your Vapor project using <a href="../../getting-started/application/#services">services</a>.
In this section we will add the Fluent service provider to your application and configure your databases.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>This section assumes you have added both <a href="./#fluent">Fluent</a> and a <a href="./#database">Fluent database</a> to your package.</p>
</div>
<h2 id="service-provider">Service Provider<a class="headerlink" href="#service-provider" title="Permanent link">&para;</a></h2>
<p>The first step to using Fluent, is registering it with your Vapor application.</p>
<div class="codehilite"><pre><span></span><span class="kd">import</span> <span class="nc">Fluent</span>
<span class="p">...</span>
<span class="k">try</span> <span class="n">services</span><span class="p">.</span><span class="n">instance</span><span class="p">(</span><span class="n">FluentProvider</span><span class="p">())</span>
</pre></div>
<p>Register the <code>FluentProvider</code> in the <a href="../../getting-started/structure/#configure">configure section</a> of your application.</p>
<div class="admonition question">
<p class="admonition-title">Question</p>
<p>Learn more about how service providers work in <a href="../../getting-started/application/#providers">Getting Started: Application</a>
and <a href="../../concepts/services/#providers">Concepts: Services</a>.</p>
</div>
<h2 id="config">Config<a class="headerlink" href="#config" title="Permanent link">&para;</a></h2>
<p>Once the service provider has been added, we can configure one or more databases
to be used with Fluent.</p>
<h3 id="identifier">Identifier<a class="headerlink" href="#identifier" title="Permanent link">&para;</a></h3>
<p>Each database you use with Fluent must have a unique identifier. The easiest way to
keep track of this identifier is to add it as static extension to <code>DatabaseIdentifier</code>.</p>
<div class="codehilite"><pre><span></span><span class="kd">import</span> <span class="nc">Fluent</span>
<span class="kd">import</span> <span class="nc">FluentMySQL</span>
<span class="kd">import</span> <span class="nc">FluentSQLite</span>
<span class="kd">extension</span> <span class="nc">DatabaseIdentifier</span> <span class="p">{</span>
<span class="kd">static</span> <span class="kd">var</span> <span class="nv">foo</span><span class="p">:</span> <span class="n">DatabaseIdentifier</span><span class="p">&lt;</span><span class="n">SQLiteDatabase</span><span class="p">&gt;</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">.</span><span class="kd">init</span><span class="p">(</span><span class="s">&quot;foo&quot;</span><span class="p">)</span>
<span class="p">}</span>
<span class="kd">static</span> <span class="kd">var</span> <span class="nv">bar</span><span class="p">:</span> <span class="n">DatabaseIdentifier</span><span class="p">&lt;</span><span class="n">MySQLDatabase</span><span class="p">&gt;</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">.</span><span class="kd">init</span><span class="p">(</span><span class="s">&quot;bar&quot;</span><span class="p">)</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
<p>Now we can use the identifier anywhere in our project:</p>
<div class="codehilite"><pre><span></span><span class="n">req</span><span class="p">.</span><span class="n">database</span><span class="p">(.</span><span class="n">foo</span><span class="p">)</span> <span class="p">{</span> <span class="p">...</span> <span class="p">}</span>
</pre></div>
<p>The <a href="../../getting-started/structure/#configure">configure section</a> of your project is a good place to put this extension.</p>
<h3 id="databases">Databases<a class="headerlink" href="#databases" title="Permanent link">&para;</a></h3>
<p>Now that we have created a unique identifier for our database, we can register it
to our application using <code>DatabaseConfig</code>. A good place to do this is in the
<a href="../../getting-started/structure/#configure">configure section</a> of your project.</p>
<p>You can add databases to the <code>DatabaseConfig</code> using either a type (<code>.self</code>) or an instance.</p>
<h4 id="type">Type<a class="headerlink" href="#type" title="Permanent link">&para;</a></h4>
<p>If you register a database type (like <code>SQLiteDatabase.self</code>), Fluent will ask the application
to create an instance of your database at boot.</p>
<div class="codehilite"><pre><span></span><span class="kd">import</span> <span class="nc">Fluent</span>
<span class="kd">import</span> <span class="nc">FluentSQLite</span>
<span class="p">...</span>
<span class="kd">var</span> <span class="nv">databaseConfig</span> <span class="p">=</span> <span class="n">DatabaseConfig</span><span class="p">()</span>
<span class="n">databaseConfig</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="n">database</span><span class="p">:</span> <span class="n">SQLiteDatabase</span><span class="p">.</span><span class="kc">self</span><span class="p">,</span> <span class="k">as</span><span class="p">:</span> <span class="p">.</span><span class="n">foo</span><span class="p">)</span>
<span class="n">services</span><span class="p">.</span><span class="n">instance</span><span class="p">(</span><span class="n">databaseConfig</span><span class="p">)</span>
</pre></div>
<h4 id="instance">Instance<a class="headerlink" href="#instance" title="Permanent link">&para;</a></h4>
<p>You can also register a pre-initialized database. This is especially useful if you'd
like to configure two instances of the same database type.</p>
<div class="codehilite"><pre><span></span><span class="kd">import</span> <span class="nc">Fluent</span>
<span class="kd">import</span> <span class="nc">FluentMySQL</span>
<span class="p">...</span>
<span class="kd">var</span> <span class="nv">databaseConfig</span> <span class="p">=</span> <span class="n">DatabaseConfig</span><span class="p">()</span>
<span class="kd">let</span> <span class="nv">mysql</span> <span class="p">=</span> <span class="n">MySQLDatabase</span><span class="p">(...)</span>
<span class="n">databaseConfig</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="n">database</span><span class="p">:</span> <span class="n">mysql</span><span class="p">,</span> <span class="k">as</span><span class="p">:</span> <span class="p">.</span><span class="n">bar</span><span class="p">)</span>
<span class="n">services</span><span class="p">.</span><span class="n">instance</span><span class="p">(</span><span class="n">databaseConfig</span><span class="p">)</span>
</pre></div>
<h3 id="migrations">Migrations<a class="headerlink" href="#migrations" title="Permanent link">&para;</a></h3>
<p>If your database uses schemas (most SQL databases do, whereas NoSQL databases don't), you will also want to configure
your migrations using <code>MigrationConfig</code>.</p>
<div class="codehilite"><pre><span></span><span class="kd">import</span> <span class="nc">Fluent</span>
<span class="p">...</span>
<span class="kd">var</span> <span class="nv">migrationConfig</span> <span class="p">=</span> <span class="n">MigrationConfig</span><span class="p">()</span>
<span class="n">migrationConfig</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="n">migration</span><span class="p">:</span> <span class="n">User</span><span class="p">.</span><span class="kc">self</span><span class="p">,</span> <span class="n">database</span><span class="p">:</span> <span class="p">.</span><span class="n">foo</span><span class="p">)</span>
<span class="n">services</span><span class="p">.</span><span class="n">instance</span><span class="p">(</span><span class="n">migrationConfig</span><span class="p">)</span>
</pre></div>
<p>You can read more about migrations in <a href="../migrations/">Fluent: Migrations</a>.</p>
<h2 id="done">Done<a class="headerlink" href="#done" title="Permanent link">&para;</a></h2>
<p>You should now be able to compile and run your application. The next step is to create your models.</p>
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