self.increment_counter(counter_name, id) — ActiveRecord::Base

self.increment_counter(counter_name, id)

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.

Parameters

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

Examples

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

Parameters

counter_name req
id req

Source

# File activerecord/lib/active_record/base.rb, line 1007
      def increment_counter(counter_name, id)
        update_counters(id, counter_name => 1)
      end

Defined in activerecord/lib/active_record/base.rb line 1007 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveRecord::Base

Signature

Parameters

Examples

Parameters