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<div class="main-content">
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<h1 class="type-name">
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<span class="kind">module</span> DB::<wbr>Serializable
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</h1>
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<h2>
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<a id="overview" class="anchor" href="#overview">
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<use href="#octicon-link"/>
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</svg>
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</a>
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Overview
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</h2>
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<p>The <code>DB::Serialization</code> module automatically generates methods for DB serialization when included.</p>
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<p>Once included, <code><a href="../DB/ResultSet.html#read%28type%3AEnum.class%29-instance-method">ResultSet#read(t)</a></code> populates properties of the class from the
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<code><a href="../DB/ResultSet.html">ResultSet</a></code>.</p>
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<h3><a id="example" class="anchor" href="#example">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>Example</h3>
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<pre><code class="language-crystal"><span class="k">require</span> <span class="s">"db"</span>
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<span class="k">class</span> <span class="t">Employee</span>
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<span class="k">include</span> <span class="t">DB</span><span class="t">::</span><span class="t">Serializable</span>
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property title : <span class="t">String</span>
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property name : <span class="t">String</span>
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<span class="k">end</span>
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employees <span class="o">=</span> <span class="t">Employee</span>.from_rs(db.query(<span class="s">"SELECT title, name FROM employees"</span>))
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employees[<span class="n">0</span>].title <span class="c"># => "Manager"</span>
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employees[<span class="n">0</span>].name <span class="c"># => "John"</span></code></pre>
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<h3><a id="usage" class="anchor" href="#usage">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>Usage</h3>
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<p><code><a href="../DB/Serializable.html">DB::Serializable</a></code> was designed in analogue with <code>JSON::Serializable</code>, so usage is identical.
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However, like <code><a href="../DB.html#mapping%28%2A%2Aproperties%29-macro">DB.mapping</a></code>, <code><a href="../DB/Serializable.html">DB::Serializable</a></code> is <strong>strict by default</strong>, so extra columns will raise <code><a href="../DB/MappingException.html">DB::MappingException</a></code>s.</p>
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<p>Similar to <code>JSON::Field</code>, there is an annotation <code><a href="../DB/Field.html">DB::Field</a></code> that can be used to set serialization behavior
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on individual instance variables.</p>
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<pre><code class="language-crystal"><span class="k">class</span> <span class="t">Employee</span>
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<span class="k">include</span> <span class="t">DB</span><span class="t">::</span><span class="t">Serializable</span>
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property title : <span class="t">String</span>
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@[<span class="t">DB</span><span class="t">::</span><span class="t">Field</span>(key: <span class="s">"firstname"</span>)]
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property name : <span class="t">String</span>?
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<span class="k">end</span></code></pre>
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<p><code><a href="../DB/Field.html">DB::Field</a></code> properties:</p>
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<ul>
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<li><strong>ignore</strong>: if <code>true</code>, skip this field in serialization and deserialization (<code>false</code> by default)</li>
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<li><strong>key</strong>: defines which column to read from a <code><a href="../DB/ResultSet.html">ResultSet</a></code> (name of the instance variable by default)</li>
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<li><strong>converter</strong>: defines an alternate type for parsing results. The given type must define <code>#from_rs(DB::ResultSet)</code> and return an instance of the included type.</li>
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</ul>
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<h3><a id="dbserializablenon-strict" class="anchor" href="#dbserializablenon-strict">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a><code><a href="../DB/Serializable/NonStrict.html">DB::Serializable::NonStrict</a></code></h3>
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<p>Including this module is functionally identical to passing <code>{strict: false}</code> to <code><a href="../DB.html#mapping%28%2A%2Aproperties%29-macro">DB.mapping</a></code>: extra columns will not raise.</p>
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<pre><code class="language-crystal"><span class="k">class</span> <span class="t">Employee</span>
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<span class="k">include</span> <span class="t">DB</span><span class="t">::</span><span class="t">Serializable</span>
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<span class="k">include</span> <span class="t">DB</span><span class="t">::</span><span class="t">Serializable</span><span class="t">::</span><span class="t">NonStrict</span>
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property title : <span class="t">String</span>
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property name : <span class="t">String</span>
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<span class="k">end</span>
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<span class="c"># does not raise!</span>
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employees <span class="o">=</span> <span class="t">Employee</span>.from_rs(db.query(<span class="s">"SELECT title, name, age FROM employees"</span>))</code></pre>
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<h2>
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<a id="defined-in" class="anchor" href="#defined-in">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>
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Defined in:
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</h2>
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<a href="https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/serializable.cr#L67" target="_blank">
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db/serializable.cr
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</a>
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<br/>
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<h2>
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<a id="constructors" class="anchor" href="#constructors">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>
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Constructors
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</h2>
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<ul class="list-summary">
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<li class="entry-summary">
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<a href="#new%28%2A%2C__set_for_db_serializablers%3ADB%3A%3AResultSet%29-class-method" class="signature"><strong>.new</strong>(*, __set_for_db_serializable rs : DB::ResultSet)</a>
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</li>
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</ul>
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<div class="methods-inherited">
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</div>
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<h2>
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<a id="constructor-detail" class="anchor" href="#constructor-detail">
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<svg class="octicon-link" aria-hidden="true">
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<use href="#octicon-link"/>
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</svg>
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</a>
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Constructor Detail
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</h2>
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<div class="entry-detail" id="new(*,__set_for_db_serializablers:DB::ResultSet)-class-method">
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<div class="signature">
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def self.<strong>new</strong>(*, __set_for_db_serializable rs : <a href="../DB/ResultSet.html">DB::ResultSet</a>)
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<a class="method-permalink" href="#new%28%2A%2C__set_for_db_serializablers%3ADB%3A%3AResultSet%29-class-method">#</a>
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</div>
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<br/>
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<div>
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[<a href="https://github.com/crystal-lang/crystal-db/blob/v0.13.1/src/db/serializable.cr#L104" target="_blank">View source</a>]
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</div>
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</body>
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