diff options
| -rw-r--r-- | activerecord/lib/active_record/counter_cache.rb | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/counter_cache.rb b/activerecord/lib/active_record/counter_cache.rb index 237cd56683..ed0d4aef7f 100644 --- a/activerecord/lib/active_record/counter_cache.rb +++ b/activerecord/lib/active_record/counter_cache.rb @@ -56,15 +56,15 @@ module ActiveRecord # Post.update_counters 5, :comment_count => -1, :action_count => 1 # # Executes the following SQL: # # UPDATE posts - # # SET comment_count = comment_count - 1, - # # action_count = action_count + 1 + # # SET comment_count = COALESCE(comment_count, 0) - 1, + # # action_count = COALESCE(action_count, 0) + 1 # # WHERE id = 5 # # # For the Posts with id of 10 and 15, increment the comment_count by 1 # Post.update_counters [10, 15], :comment_count => 1 # # Executes the following SQL: # # UPDATE posts - # # SET comment_count = comment_count + 1, + # # SET comment_count = COALESCE(comment_count, 0) + 1, # # WHERE id IN (10, 15) def update_counters(id, counters) updates = counters.map do |counter_name, value| |