v3.0.0 - Show latest stable - 0 notes - Class: ActiveRecord::CounterCache
increment_counter(counter_name, id) public

Increment a number field by one, usually representing a count.

This is used for caching aggregate values, so that they don’t need to be computed every time. For example, a DiscussionBoard may cache post_count and comment_count otherwise every time the board is shown it would have to run an SQL query to find how many posts and comments there are.


  • counter_name - The name of the field that should be incremented.
  • id - The id of the object that should be incremented.


  # Increment the post_count column for the record with an id of 5
  DiscussionBoard.increment_counter(:post_count, 5)
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