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<title>Module: ActiveRecord::Observing::ClassMethods</title>
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<td><strong>Module</strong></td>
<td class="class-name-in-header">ActiveRecord::Observing::ClassMethods</td>
</tr>
<tr class="top-aligned-row">
<td><strong>In:</strong></td>
<td>
<a href="../../../files/lib/active_record/observer_rb.html">
lib/active_record/observer.rb
</a>
<br />
</td>
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<h3 class="section-bar">Methods</h3>
<div class="name-list">
<a href="#M000062">inherited</a>
<a href="#M000061">instantiate_observers</a>
<a href="#M000060">observers</a>
<a href="#M000059">observers=</a>
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<h3 class="section-bar">Public Instance methods</h3>
<div id="method-M000061" class="method-detail">
<a name="M000061"></a>
<div class="method-heading">
<a href="ClassMethods.src/M000061.html" target="Code" class="method-signature"
onclick="popupCode('ClassMethods.src/M000061.html');return false;">
<span class="method-name">instantiate_observers</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p>
Instantiate the global Active Record <a
href="ClassMethods.html#M000060">observers</a>.
</p>
</div>
</div>
<div id="method-M000060" class="method-detail">
<a name="M000060"></a>
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<a href="ClassMethods.src/M000060.html" target="Code" class="method-signature"
onclick="popupCode('ClassMethods.src/M000060.html');return false;">
<span class="method-name">observers</span><span class="method-args">()</span>
</a>
</div>
<div class="method-description">
<p>
Gets the current <a href="ClassMethods.html#M000060">observers</a>.
</p>
</div>
</div>
<div id="method-M000059" class="method-detail">
<a name="M000059"></a>
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<a href="ClassMethods.src/M000059.html" target="Code" class="method-signature"
onclick="popupCode('ClassMethods.src/M000059.html');return false;">
<span class="method-name">observers=</span><span class="method-args">(*observers)</span>
</a>
</div>
<div class="method-description">
<p>
Activates the <a href="ClassMethods.html#M000060">observers</a> assigned.
Examples:
</p>
<pre>
# Calls PersonObserver.instance
ActiveRecord::Base.observers = :person_observer
# Calls Cacher.instance and GarbageCollector.instance
ActiveRecord::Base.observers = :cacher, :garbage_collector
# Same as above, just using explicit class references
ActiveRecord::Base.observers = Cacher, GarbageCollector
</pre>
<p>
Note: Setting this does not instantiate the <a
href="ClassMethods.html#M000060">observers</a> yet. <tt><a
href="ClassMethods.html#M000061">instantiate_observers</a></tt> is called
during startup, and before each development request.
</p>
</div>
</div>
<h3 class="section-bar">Protected Instance methods</h3>
<div id="method-M000062" class="method-detail">
<a name="M000062"></a>
<div class="method-heading">
<a href="ClassMethods.src/M000062.html" target="Code" class="method-signature"
onclick="popupCode('ClassMethods.src/M000062.html');return false;">
<span class="method-name">inherited</span><span class="method-args">(subclass)</span>
</a>
</div>
<div class="method-description">
<p>
Notify <a href="ClassMethods.html#M000060">observers</a> when the observed
class is subclassed.
</p>
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