instance method
decrement_counter
Ruby on Rails 3.2.22.5
Since v3.0.20 Last seen in v3.2.22.5Signature
decrement_counter(counter_name, id)Decrement a number field by one, usually representing a count.
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.
Examples
# Decrement the post_count column for the record with an id of 5 DiscussionBoard.decrement_counter(:post_count, 5)
Parameters
-
counter_namereq -
idreq
Source
# File activerecord/lib/active_record/counter_cache.rb, line 119
def decrement_counter(counter_name, id)
update_counters(id, counter_name => -1)
end
Defined in activerecord/lib/active_record/counter_cache.rb line 119
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Defined in ActiveRecord::CounterCache