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<article class="main-content">
<section class="section">
<div class="section-content">
<h1>MigrationChain</h1>
<div class="declaration">
<div class="language">
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">struct</span> <span class="kt">MigrationChain</span> <span class="p">:</span> <span class="kt">ExpressibleByNilLiteral</span><span class="p">,</span> <span class="kt">ExpressibleByStringLiteral</span><span class="p">,</span> <span class="kt">ExpressibleByDictionaryLiteral</span><span class="p">,</span> <span class="kt">ExpressibleByArrayLiteral</span><span class="p">,</span> <span class="kt">Equatable</span></code></pre>
</div>
</div>
<p>A <code>MigrationChain</code> indicates the sequence of model versions to be used as the order for progressive migrations. This is typically passed to the <code><a href="../Classes/SchemaHistory.html">SchemaHistory</a></code> or the <code><a href="../Classes/DataStack.html">DataStack</a></code> initializer and will be applied to all stores added to the <code><a href="../Classes/DataStack.html">DataStack</a></code> with <code>addStorage(...)</code> and its variants.</p>
<p>Initializing with empty values (either <code>nil</code>, <code>[]</code>, or <code>[:]</code>) instructs the <code><a href="../Classes/DataStack.html">DataStack</a></code> to use the .xcdatamodel&rsquo;s current version as the final version, and to disable progressive migrations:</p>
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">dataStack</span> <span class="o">=</span> <span class="kt">DataStack</span><span class="p">(</span><span class="nv">migrationChain</span><span class="p">:</span> <span class="kc">nil</span><span class="p">)</span>
</code></pre>
<p>This means that the mapping model will be computed from the store&rsquo;s version straight to the <code><a href="../Classes/DataStack.html">DataStack</a></code>&lsquo;s model version.
To support progressive migrations, specify the linear order of versions:</p>
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">dataStack</span> <span class="o">=</span> <span class="kt">DataStack</span><span class="p">(</span><span class="nv">migrationChain</span><span class="p">:</span>
<span class="p">[</span><span class="s">"MyAppModel"</span><span class="p">,</span> <span class="s">"MyAppModelV2"</span><span class="p">,</span> <span class="s">"MyAppModelV3"</span><span class="p">,</span> <span class="s">"MyAppModelV4"</span><span class="p">])</span>
</code></pre>
<p>or for more complex migration paths, a version tree that maps the key-values to the source-destination versions:</p>
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">dataStack</span> <span class="o">=</span> <span class="kt">DataStack</span><span class="p">(</span><span class="nv">migrationChain</span><span class="p">:</span> <span class="p">[</span>
<span class="s">"MyAppModel"</span><span class="p">:</span> <span class="s">"MyAppModelV3"</span><span class="p">,</span>
<span class="s">"MyAppModelV2"</span><span class="p">:</span> <span class="s">"MyAppModelV4"</span><span class="p">,</span>
<span class="s">"MyAppModelV3"</span><span class="p">:</span> <span class="s">"MyAppModelV4"</span>
<span class="p">])</span>
</code></pre>
<p>This allows for different migration paths depending on the starting version. The example above resolves to the following paths:</p>
<ul>
<li>MyAppModel-MyAppModelV3-MyAppModelV4</li>
<li>MyAppModelV2-MyAppModelV4</li>
<li>MyAppModelV3-MyAppModelV4</li>
</ul>
<p>The <code>MigrationChain</code> is validated when passed to the <code><a href="../Classes/DataStack.html">DataStack</a></code> and unless it is empty, will raise an assertion if any of the following conditions are met:</p>
<ul>
<li>a version appears twice in an array</li>
<li>a version appears twice as a key in a dictionary literal</li>
<li>a loop is found in any of the paths</li>
</ul>
</div>
</section>
<section class="section">
<div class="section-content">
<div class="task-group">
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:9CoreStore14MigrationChainVACycfc"></a>
<a name="//apple_ref/swift/Method/init()" class="dashAnchor"></a>
<a class="token" href="#/s:9CoreStore14MigrationChainVACycfc">init()</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Initializes the <code>MigrationChain</code> with empty values, which instructs the <code><a href="../Classes/DataStack.html">DataStack</a></code> to use the .xcdatamodel&rsquo;s current version as the final version, and to disable progressive migrations.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">()</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9CoreStore14MigrationChainVyACSScfc"></a>
<a name="//apple_ref/swift/Method/init(_:)" class="dashAnchor"></a>
<a class="token" href="#/s:9CoreStore14MigrationChainVyACSScfc">init(_:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Initializes the <code>MigrationChain</code> with a single model version, which instructs the <code><a href="../Classes/DataStack.html">DataStack</a></code> to use the the specified version as the final version, and to disable progressive migrations.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="n">_</span> <span class="nv">value</span><span class="p">:</span> <span class="kt">String</span><span class="p">)</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9CoreStore14MigrationChainVyACxcSlRzSS7ElementRtzlufc"></a>
<a name="//apple_ref/swift/Method/init(_:)" class="dashAnchor"></a>
<a class="token" href="#/s:9CoreStore14MigrationChainVyACxcSlRzSS7ElementRtzlufc">init(_:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Initializes the <code>MigrationChain</code> with a linear order of versions, which becomes the order of the <code><a href="../Classes/DataStack.html">DataStack</a></code>&lsquo;s progressive migrations.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">init</span><span class="o">&lt;</span><span class="kt">T</span><span class="o">&gt;</span><span class="p">(</span><span class="n">_</span> <span class="nv">elements</span><span class="p">:</span> <span class="kt">T</span><span class="p">)</span> <span class="k">where</span> <span class="kt">T</span> <span class="p">:</span> <span class="kt">Collection</span><span class="p">,</span> <span class="kt">T</span><span class="o">.</span><span class="kt">Element</span> <span class="o">==</span> <span class="kt">String</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9CoreStore14MigrationChainVyACSaySS_SStGcfc"></a>
<a name="//apple_ref/swift/Method/init(_:)" class="dashAnchor"></a>
<a class="token" href="#/s:9CoreStore14MigrationChainVyACSaySS_SStGcfc">init(_:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Initializes the <code>MigrationChain</code> with a version tree, which becomes the order of the <code><a href="../Classes/DataStack.html">DataStack</a></code>&lsquo;s progressive migrations.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="n">_</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">[(</span><span class="kt">String</span><span class="p">,</span> <span class="kt">String</span><span class="p">)])</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9CoreStore14MigrationChainVyACSDyS2SGcfc"></a>
<a name="//apple_ref/swift/Method/init(_:)" class="dashAnchor"></a>
<a class="token" href="#/s:9CoreStore14MigrationChainVyACSDyS2SGcfc">init(_:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Initializes the <code>MigrationChain</code> with a version tree, which becomes the order of the <code><a href="../Classes/DataStack.html">DataStack</a></code>&lsquo;s progressive migrations.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="n">_</span> <span class="nv">dictionary</span><span class="p">:</span> <span class="p">[</span><span class="kt">String</span> <span class="p">:</span> <span class="kt">String</span><span class="p">])</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<div class="task-name-container">
<a name="/ExpressibleByNilLiteral"></a>
<a name="//apple_ref/swift/Section/ExpressibleByNilLiteral" class="dashAnchor"></a>
<a href="#/ExpressibleByNilLiteral">
<h3 class="section-name">ExpressibleByNilLiteral</h3>
</a>
</div>
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:s23ExpressibleByNilLiteralP03nilD0xyt_tcfc"></a>
<a name="//apple_ref/swift/Method/init(nilLiteral:)" class="dashAnchor"></a>
<a class="token" href="#/s:s23ExpressibleByNilLiteralP03nilD0xyt_tcfc">init(nilLiteral:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="nv">nilLiteral</span><span class="p">:</span> <span class="p">())</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<div class="task-name-container">
<a name="/ExpressibleByStringLiteral"></a>
<a name="//apple_ref/swift/Section/ExpressibleByStringLiteral" class="dashAnchor"></a>
<a href="#/ExpressibleByStringLiteral">
<h3 class="section-name">ExpressibleByStringLiteral</h3>
</a>
</div>
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:s26ExpressibleByStringLiteralP06stringD0x0cD4TypeQz_tcfc"></a>
<a name="//apple_ref/swift/Method/init(stringLiteral:)" class="dashAnchor"></a>
<a class="token" href="#/s:s26ExpressibleByStringLiteralP06stringD0x0cD4TypeQz_tcfc">init(stringLiteral:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="n">stringLiteral</span> <span class="nv">value</span><span class="p">:</span> <span class="kt">String</span><span class="p">)</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<div class="task-name-container">
<a name="/ExtendedGraphemeClusterLiteralConvertible"></a>
<a name="//apple_ref/swift/Section/ExtendedGraphemeClusterLiteralConvertible" class="dashAnchor"></a>
<a href="#/ExtendedGraphemeClusterLiteralConvertible">
<h3 class="section-name">ExtendedGraphemeClusterLiteralConvertible</h3>
</a>
</div>
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:s43ExpressibleByExtendedGraphemeClusterLiteralP08extendeddeF0x0cdeF4TypeQz_tcfc"></a>
<a name="//apple_ref/swift/Method/init(extendedGraphemeClusterLiteral:)" class="dashAnchor"></a>
<a class="token" href="#/s:s43ExpressibleByExtendedGraphemeClusterLiteralP08extendeddeF0x0cdeF4TypeQz_tcfc">init(extendedGraphemeClusterLiteral:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="n">extendedGraphemeClusterLiteral</span> <span class="nv">value</span><span class="p">:</span> <span class="kt">String</span><span class="p">)</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<div class="task-name-container">
<a name="/UnicodeScalarLiteralConvertible"></a>
<a name="//apple_ref/swift/Section/UnicodeScalarLiteralConvertible" class="dashAnchor"></a>
<a href="#/UnicodeScalarLiteralConvertible">
<h3 class="section-name">UnicodeScalarLiteralConvertible</h3>
</a>
</div>
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:s33ExpressibleByUnicodeScalarLiteralP07unicodedE0x0cdE4TypeQz_tcfc"></a>
<a name="//apple_ref/swift/Method/init(unicodeScalarLiteral:)" class="dashAnchor"></a>
<a class="token" href="#/s:s33ExpressibleByUnicodeScalarLiteralP07unicodedE0x0cdE4TypeQz_tcfc">init(unicodeScalarLiteral:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="n">unicodeScalarLiteral</span> <span class="nv">value</span><span class="p">:</span> <span class="kt">String</span><span class="p">)</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<div class="task-name-container">
<a name="/ExpressibleByDictionaryLiteral"></a>
<a name="//apple_ref/swift/Section/ExpressibleByDictionaryLiteral" class="dashAnchor"></a>
<a href="#/ExpressibleByDictionaryLiteral">
<h3 class="section-name">ExpressibleByDictionaryLiteral</h3>
</a>
</div>
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:s30ExpressibleByDictionaryLiteralP010dictionaryD0x3KeyQz_5ValueQztd_tcfc"></a>
<a name="//apple_ref/swift/Method/init(dictionaryLiteral:)" class="dashAnchor"></a>
<a class="token" href="#/s:s30ExpressibleByDictionaryLiteralP010dictionaryD0x3KeyQz_5ValueQztd_tcfc">init(dictionaryLiteral:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="n">dictionaryLiteral</span> <span class="nv">elements</span><span class="p">:</span> <span class="p">(</span><span class="kt">String</span><span class="p">,</span> <span class="kt">String</span><span class="p">)</span><span class="o">...</span><span class="p">)</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<div class="task-name-container">
<a name="/ExpressibleByArrayLiteral"></a>
<a name="//apple_ref/swift/Section/ExpressibleByArrayLiteral" class="dashAnchor"></a>
<a href="#/ExpressibleByArrayLiteral">
<h3 class="section-name">ExpressibleByArrayLiteral</h3>
</a>
</div>
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:s25ExpressibleByArrayLiteralP05arrayD0x0cD7ElementQzd_tcfc"></a>
<a name="//apple_ref/swift/Method/init(arrayLiteral:)" class="dashAnchor"></a>
<a class="token" href="#/s:s25ExpressibleByArrayLiteralP05arrayD0x0cD7ElementQzd_tcfc">init(arrayLiteral:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span><span class="n">arrayLiteral</span> <span class="nv">elements</span><span class="p">:</span> <span class="kt">String</span><span class="o">...</span><span class="p">)</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<div class="task-name-container">
<a name="/Equatable"></a>
<a name="//apple_ref/swift/Section/Equatable" class="dashAnchor"></a>
<a href="#/Equatable">
<h3 class="section-name">Equatable</h3>
</a>
</div>
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:SQ2eeoiySbx_xtFZ"></a>
<a name="//apple_ref/swift/Method/==(_:_:)" class="dashAnchor"></a>
<a class="token" href="#/s:SQ2eeoiySbx_xtFZ">==(_:_:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">static</span> <span class="kd">func</span> <span class="o">==</span> <span class="p">(</span><span class="nv">lhs</span><span class="p">:</span> <span class="kt">MigrationChain</span><span class="p">,</span> <span class="nv">rhs</span><span class="p">:</span> <span class="kt">MigrationChain</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Bool</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<div class="task-name-container">
<a name="/CustomDebugStringConvertible"></a>
<a name="//apple_ref/swift/Section/CustomDebugStringConvertible" class="dashAnchor"></a>
<a href="#/CustomDebugStringConvertible">
<h3 class="section-name">CustomDebugStringConvertible</h3>
</a>
</div>
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:s28CustomDebugStringConvertibleP16debugDescriptionSSvp"></a>
<a name="//apple_ref/swift/Property/debugDescription" class="dashAnchor"></a>
<a class="token" href="#/s:s28CustomDebugStringConvertibleP16debugDescriptionSSvp">debugDescription</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="kt">String</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
</div>
</section>
</article>
</div>
<section class="footer">
<p>&copy; 2018 <a class="link" href="https://github.com/JohnEstropia" target="_blank" rel="external">John Estropia</a>. All rights reserved. (Last updated: 2018-12-19)</p>
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