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# Fix for counter cache not being updated on related model updates.
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# See: https://github.com/rails/rails/issues/9722
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# TODO: remove when upgrading to Rails 4.x
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# inspired by fix from http://stackoverflow.com/a/11569554/1091445
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module CounterCacheFix
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extend ActiveSupport::Concern
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included do
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after_commit :update_counter_caches
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def update_counter_caches
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self.changes.each do |key, (old_value, new_value)|
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if key =~ /_id/
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association = self.association(key.sub(/_id$/, '').to_sym)
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if association.options[ :counter_cache ]
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counter_name = self.class.name.underscore.split("/")[0].pluralize.to_sym
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association.klass.reset_counters(old_value, counter_name) if old_value
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association.klass.reset_counters(new_value, counter_name) if new_value
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end
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end
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end
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end
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end
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end
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