Use COALESCE in update_counters docs to reflect the implementation
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@ -56,15 +56,15 @@ module ActiveRecord
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# Post.update_counters 5, :comment_count => -1, :action_count => 1
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# # Executes the following SQL:
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# # UPDATE posts
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# # SET comment_count = comment_count - 1,
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# # action_count = action_count + 1
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# # SET comment_count = COALESCE(comment_count, 0) - 1,
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# # action_count = COALESCE(action_count, 0) + 1
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# # WHERE id = 5
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#
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# # For the Posts with id of 10 and 15, increment the comment_count by 1
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# Post.update_counters [10, 15], :comment_count => 1
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# # Executes the following SQL:
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# # UPDATE posts
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# # SET comment_count = comment_count + 1,
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# # SET comment_count = COALESCE(comment_count, 0) + 1,
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# # WHERE id IN (10, 15)
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def update_counters(id, counters)
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updates = counters.map do |counter_name, value|
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