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Summary: Regenerated the IGListKit documentation via jazzy. Reviewed By: fabiomassimo Differential Revision: D57263196 fbshipit-source-id: 1a649e29a4bfa0d12fa81d00f96ea9264a68f013
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<h1 id='iglistdiffable-and-equality' class='heading'>IGListDiffable and Equality</h1>
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<p>This guide explains the <code><a href="Protocols/IGListDiffable.html">IGListDiffable</a></code> protocol and how to write good <code>-isEqual:</code> methods. </p>
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<h2 id='background' class='heading'>Background</h2>
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<p>The <a href="https://instagram.github.io/IGListKit/Protocols/IGListDiffable.html"><code><a href="Protocols/IGListDiffable.html">IGListDiffable</a></code> protocol</a> requires clients to implement two methods, <code>-diffIdentifier</code> and <code>-isEqualToDiffableObject:</code>.</p>
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<p>The method <code>-isEqualToDiffableObject:</code> should perform the same type of check as <code>-isEqual:</code>, but without impacting performance characteristics, like in Objective-C containers such as <code>NSDictionary</code> and <code>NSSet</code>.</p>
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<p>Why are both of these methods required for diffing? The point of having the two methods has to do with <strong>identity</strong> and <strong>equality</strong>, where the diff identifier uniquely identifies data (common scenario is primary key in databases). Equality comes into play when comparing the values of two uniquely identical objects (driving reloading).</p>
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<p>See also: <a href="https://github.com/Instagram/IGListKit/issues/509">#509</a></p>
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<h2 id='code-iglistdiffable-code-bare-minimum' class='heading'><code><a href="Protocols/IGListDiffable.html">IGListDiffable</a></code> bare minimum</h2>
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<p>The quickest way to get started with diffable models is use the <em>object itself</em> as the identifier, and use the superclass’s <code>-[NSObject isEqual:]</code> implementation for equality:</p>
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<pre class="highlight objective_c"><code><span class="k">-</span> <span class="p">(</span><span class="n">id</span><span class="o"><</span><span class="n">NSObject</span><span class="o">></span><span class="p">)</span><span class="n">diffIdentifier</span> <span class="p">{</span>
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<span class="k">return</span> <span class="n">self</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">-</span> <span class="p">(</span><span class="n">BOOL</span><span class="p">)</span><span class="nf">isEqualToDiffableObject</span><span class="p">:(</span><span class="n">id</span><span class="o"><</span><span class="n">IGListDiffable</span><span class="o">></span><span class="p">)</span><span class="nv">object</span> <span class="p">{</span>
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<span class="k">return</span> <span class="p">[</span><span class="n">self</span> <span class="nf">isEqual</span><span class="p">:</span><span class="n">object</span><span class="p">];</span>
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<span class="p">}</span>
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</code></pre>
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<h2 id='writing-better-equality-methods' class='heading'>Writing better Equality methods</h2>
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<p>Even though <code>IGListKit</code> uses the method <code>-isEqualToDiffableObject:</code>, the concepts of writing a good equality check apply in general. Here are the basics to writing good <code>-isEqual:</code> and <code>-hash</code> functions. Note this is all Objective-C but applies to Swift also.</p>
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<ul>
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<li>If you override <code>-isEqual:</code> you <strong>must</strong> override <code>-hash</code>. Check out this <a href="https://www.mikeash.com/pyblog/friday-qa-2010-06-18-implementing-equality-and-hashing.html">article by Mike Ash</a> for details.</li>
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<li>Always compare the pointer first. This saves a lot of wasteful <code>objc_msgSend(...)</code> calls and value comparisons if checking the same instance.</li>
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<li>When comparing object values, always check for <code>nil</code> before <code>-isEqual:</code>. For example, <code>[nil isEqual:nil]</code> counterintuitively returns <code>NO</code>. Instead, do <code>left == right || [left isEqual:right]</code>.</li>
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<li>Always compare the <strong>cheapest values first</strong>. For example, doing <code>[self.array isEqual:other.array] && self.intVal == other.intVal</code> is extremely wasteful if the <code>intVal</code> values are different. Use lazy evaluation!</li>
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</ul>
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<p>As an example, if I had a <code>User</code> model with the following interface:</p>
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<pre class="highlight objective_c"><code><span class="k">@interface</span> <span class="nc">User</span> <span class="p">:</span> <span class="nc">NSObject</span>
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<span class="k">@property</span> <span class="n">NSInteger</span> <span class="n">identifier</span><span class="p">;</span>
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<span class="k">@property</span> <span class="n">NSString</span> <span class="o">*</span><span class="n">name</span><span class="p">;</span>
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<span class="k">@property</span> <span class="n">NSArray</span> <span class="o">*</span><span class="n">posts</span><span class="p">;</span>
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<span class="k">@end</span>
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</code></pre>
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<p>You would implement its equality methods like so:</p>
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<pre class="highlight objective_c"><code><span class="k">@implementation</span> <span class="nc">User</span>
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<span class="k">-</span> <span class="p">(</span><span class="n">NSUInteger</span><span class="p">)</span><span class="n">hash</span> <span class="p">{</span>
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<span class="k">return</span> <span class="n">self</span><span class="p">.</span><span class="n">identifier</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">-</span> <span class="p">(</span><span class="n">BOOL</span><span class="p">)</span><span class="nf">isEqual</span><span class="p">:(</span><span class="n">id</span><span class="p">)</span><span class="nv">object</span> <span class="p">{</span>
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<span class="k">if</span> <span class="p">(</span><span class="n">self</span> <span class="o">==</span> <span class="n">object</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">return</span> <span class="nb">YES</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="p">[</span><span class="n">object</span> <span class="nf">isKindOfClass</span><span class="p">:[</span><span class="n">User</span> <span class="nf">class</span><span class="p">]])</span> <span class="p">{</span>
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<span class="k">return</span> <span class="nb">NO</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="n">User</span> <span class="o">*</span><span class="n">right</span> <span class="o">=</span> <span class="n">object</span><span class="p">;</span>
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<span class="k">return</span> <span class="n">self</span><span class="p">.</span><span class="n">identifier</span> <span class="o">==</span> <span class="n">right</span><span class="p">.</span><span class="n">identifier</span>
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<span class="o">&&</span> <span class="p">(</span><span class="n">self</span><span class="p">.</span><span class="n">name</span> <span class="o">==</span> <span class="n">right</span><span class="p">.</span><span class="n">name</span> <span class="o">||</span> <span class="p">[</span><span class="n">self</span><span class="p">.</span><span class="n">name</span> <span class="nf">isEqual</span><span class="p">:</span><span class="n">right</span><span class="p">.</span><span class="n">name</span><span class="p">])</span>
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<span class="o">&&</span> <span class="p">(</span><span class="n">self</span><span class="p">.</span><span class="n">posts</span> <span class="o">==</span> <span class="n">right</span><span class="p">.</span><span class="n">posts</span> <span class="o">||</span> <span class="p">[</span><span class="n">self</span><span class="p">.</span><span class="n">posts</span> <span class="nf">isEqualToArray</span><span class="p">:</span><span class="n">right</span><span class="p">.</span><span class="n">posts</span><span class="p">]);</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="k">@end</span>
|
|
</code></pre>
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<h2 id='using-both-code-iglistdiffable-code-and-code-isequal-code' class='heading'>Using both <code><a href="Protocols/IGListDiffable.html">IGListDiffable</a></code> and <code>-isEqual:</code></h2>
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<p>Making your objects work universally with Objective-C containers and <code>IGListKit</code> is easy once you’ve implemented <code>-isEqual:</code> and <code>-hash</code>.</p>
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|
<pre class="highlight objective_c"><code><span class="k">@interface</span> <span class="nc">User</span> <span class="o"><</span><span class="n">IGListDiffable</span><span class="o">></span>
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|
<span class="c1">// properties...</span>
|
|
|
|
<span class="k">@end</span>
|
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|
|
<span class="k">@implementation</span> <span class="nc">User</span>
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|
<span class="k">-</span> <span class="p">(</span><span class="n">id</span><span class="o"><</span><span class="n">NSObject</span><span class="o">></span><span class="p">)</span><span class="n">diffIdentifier</span> <span class="p">{</span>
|
|
<span class="k">return</span> <span class="err">@</span><span class="p">(</span><span class="n">self</span><span class="p">.</span><span class="n">identifier</span><span class="p">);</span>
|
|
<span class="p">}</span>
|
|
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|
<span class="k">-</span> <span class="p">(</span><span class="n">BOOL</span><span class="p">)</span><span class="nf">isEqualToDiffableObject</span><span class="p">:(</span><span class="n">id</span><span class="o"><</span><span class="n">IGListDiffable</span><span class="o">></span><span class="p">)</span><span class="nv">object</span> <span class="p">{</span>
|
|
<span class="k">return</span> <span class="p">[</span><span class="n">self</span> <span class="nf">isEqual</span><span class="p">:</span><span class="n">object</span><span class="p">];</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="k">@end</span>
|
|
</code></pre>
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