instance method `decrement_counter`

Ruby on Rails 4.2.9

Since v4.0.13

Available in: v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

decrement_counter(counter_name, id)

Decrement a numeric field by one, via a direct SQL update.

This works the same as increment_counter but reduces the column value by 1 instead of increasing it.

Parameters

counter_name - The name of the field that should be decremented.
id - The id of the object that should be decremented or an Array of ids.

Examples

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

Parameters

counter_name req
id req

Source

# File activerecord/lib/active_record/counter_cache.rb, line 121
      def decrement_counter(counter_name, id)
        update_counters(id, counter_name => -1)
      end

Defined in activerecord/lib/active_record/counter_cache.rb line 121 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveRecord::CounterCache::ClassMethods

Signature

Parameters

Examples

Parameters