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POWhy is counter_cache column not increasing when << an association?
 

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  1. POWhy is counter_cache column not increasing when << an association?
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    <p>Given I have the following models:</p> <pre><code>class Location &lt; Active::Record has_many :storables, foreign_key: :bin_id # ... end class Storable &lt; Active::Record belongs_to :bin, class_name: :Location, counter_cache: true # ... end </code></pre> <p>When I run the following spec, the <code>counter_cache</code> doesn't increment correctly. Method <code>#1</code> and <code>#2</code> work as expected, but NOT <code>#3</code>. What gives?</p> <pre><code>describe "location storables" do specify "adding a storable increments the counter cache" do l = Location.create l.storables_count.should == 0 #=&gt; PASSES # method 1 s = Storable.create(bin: l) l.reload l.storables_count.should == 1 #=&gt; PASSES # method 2 l.storables.create l.reload l.storables_count.should == 2 #=&gt; PASSES # method 3 l.storables &lt;&lt; Storable.create l.reload l.storables_count.should == 3 #=&gt; FAILS, got 2 not 3 end end </code></pre> <p>I'm really confused by the <strong>counter_cache half working</strong>. I can't spot a configuration problem either.</p> <p>Using <strong>Rails 3.2.12</strong> on this project.</p> <p><strong>UPDATE</strong></p> <p>Upgrading to <strong>rails 4</strong> didn't help. Also, if I change method #3 to the following, the test passes:</p> <pre><code># method 3 l.storables &lt;&lt; Storable.create puts "proxy : #{l.storables.count}" #=&gt; 3 puts "relation : #{Storable.count}" #=&gt; 3 puts "cache : #{l.storables_count}" #=&gt; 2 Location.reset_counters(l.id, :storables) # corrects cache l.reload l.storables_count.should == 3 #=&gt; PASSES </code></pre> <p>Why isn't this happening automatically?</p>
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    1. USDane O'Connor
    1. USDane O'Connor
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      1. POWhy is counter_cache column not increasing when << an association?
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      1. VTUpMod
    1. CORegarding the accepted answer, I'm seeing the same behaviour with ``l.storables << Storable.last``, which is probably worse.
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      1. POWhy is counter_cache column not increasing when << an association?
      1. USdgilperez
 

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