RSpec
Ruby on Rails
Ruby
method
decrement_counter
v7.1.3.2 -
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Class: ClassMethods
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- What's this?
= private
= protected
decrement_counter(counter_name, id, by: 1, 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
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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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:by - The amount by which to decrement the value. Defaults to 1.
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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 by a specific amount. DiscussionBoard.decrement_counter(:posts_count, 5, by: 3) # 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)
