method
decrement_counter
v7.0.0 -
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- Class:
ActiveRecord::CounterCache::ClassMethods
decrement_counter(counter_name, id, touch: nil)public
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.
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id - The id of the object that should be decremented or an array of ids.
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:touch - Touch timestamp columns when updating. Pass true to touch updated_at and/or updated_on. Pass a symbol to touch that column or an array of symbols to touch just those ones.
Examples
# Decrement the posts_count column for the record with an id of 5 DiscussionBoard.decrement_counter(:posts_count, 5) # Decrement the posts_count column for the record with an id of 5 # and update the updated_at value. DiscussionBoard.decrement_counter(:posts_count, 5, touch: true)