doc/api/classes/ActiveSupport/CoreExtensions/Hash/ReverseMerge.html
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<title>Module: ActiveSupport::CoreExtensions::Hash::ReverseMerge</title>
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<td><strong>Module</strong></td>
<td class="class-name-in-header">ActiveSupport::CoreExtensions::Hash::ReverseMerge</td>
</tr>
<tr class="top-aligned-row">
<td><strong>In:</strong></td>
<td>
<a href="../../../../files/vendor/rails/activesupport/lib/active_support/core_ext/hash/reverse_merge_rb.html">
vendor/rails/activesupport/lib/active_support/core_ext/hash/reverse_merge.rb
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<p>
Allows for reverse merging where its the keys in the calling hash that wins
over those in the <tt>other_hash</tt>. This is particularly useful for
initializing an incoming option hash with default values:
</p>
<pre>
def setup(options = {})
options.reverse_merge! :size => 25, :velocity => 10
end
</pre>
<p>
The default :size and :velocity is only set if the <tt>options</tt> passed
in doesn‘t already have those keys set.
</p>
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<div id="method-list">
<h3 class="section-bar">Methods</h3>
<div class="name-list">
<a href="#M000362">reverse_merge</a>
<a href="#M000363">reverse_merge!</a>
<a href="#M000364">reverse_update</a>
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<h3 class="section-bar">Public Instance methods</h3>
<div id="method-M000362" class="method-detail">
<a name="M000362"></a>
<div class="method-heading">
<a href="#M000362" class="method-signature">
<span class="method-name">reverse_merge</span><span class="method-args">(other_hash)</span>
</a>
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<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000362-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000362-source">
<pre>
<span class="ruby-comment cmt"># File vendor/rails/activesupport/lib/active_support/core_ext/hash/reverse_merge.rb, line 13</span>
13: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">reverse_merge</span>(<span class="ruby-identifier">other_hash</span>)
14: <span class="ruby-identifier">other_hash</span>.<span class="ruby-identifier">merge</span>(<span class="ruby-keyword kw">self</span>)
15: <span class="ruby-keyword kw">end</span>
</pre>
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<a name="M000363"></a>
<div class="method-heading">
<a href="#M000363" class="method-signature">
<span class="method-name">reverse_merge!</span><span class="method-args">(other_hash)</span>
</a>
</div>
<div class="method-description">
<p><a class="source-toggle" href="#"
onclick="toggleCode('M000363-source');return false;">[Source]</a></p>
<div class="method-source-code" id="M000363-source">
<pre>
<span class="ruby-comment cmt"># File vendor/rails/activesupport/lib/active_support/core_ext/hash/reverse_merge.rb, line 17</span>
17: <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">reverse_merge!</span>(<span class="ruby-identifier">other_hash</span>)
18: <span class="ruby-identifier">replace</span>(<span class="ruby-identifier">reverse_merge</span>(<span class="ruby-identifier">other_hash</span>))
19: <span class="ruby-keyword kw">end</span>
</pre>
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<div id="method-M000364" class="method-detail">
<a name="M000364"></a>
<div class="method-heading">
<span class="method-name">reverse_update</span><span class="method-args">(other_hash)</span>
</div>
<div class="method-description">
<p>
Alias for <a href="ReverseMerge.html#M000362">reverse_merge</a>
</p>
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