module Mongoid::Association::Referenced::CounterCache::ClassMethods
Public Instance Methods
Decrement the counter name from the entries that match the id by one. This method is used on associations callbacks when counter_cache is enabled
@example Decrement comments counter
Post.decrement_counter(:comments_count, '50e0edd97c71c17ea9000001')
@param [ Symbol ] counter_name Counter cache name @param [ String ] id The id of the object that will have its counter decremented.
@since 3.1.0
# File lib/mongoid/association/referenced/counter_cache.rb, line 90 def decrement_counter(counter_name, id) update_counters(id, counter_name.to_sym => -1) end
Increment the counter name from the entries that match the id by one. This method is used on associations callbacks when counter_cache is enabled
@example Increment comments counter
Post.increment_counter(:comments_count, '50e0edd97c71c17ea9000001')
@param [ Symbol ] counter_name Counter cache name @param [ String ] id The id of the object that will have its counter incremented.
@since 3.1.0
# File lib/mongoid/association/referenced/counter_cache.rb, line 75 def increment_counter(counter_name, id) update_counters(id, counter_name.to_sym => 1) end
Reset the given counter using the .count() query from the db. This method is usuful in case that a counter got corrupted, or a new counter was added to the collection.
@example Reset the given counter cache
Post.reset_counters('50e0edd97c71c17ea9000001', :comments)
@param [ String ] id The id of the object that will be reset. @param [ Symbol, Array ] counters One
or more counter caches to reset
@since 3.1.0
# File lib/mongoid/association/referenced/counter_cache.rb, line 39 def reset_counters(id, *counters) document = id.is_a?(Document) ? id : find(id) counters.each do |name| relation_association = relations[name] counter_name = relation_association.inverse_association.counter_cache_column_name document.update_attribute(counter_name, document.send(name).count) end end
Update the given counters by the value factor. It uses the atomic $inc command.
@example Add 5 to comments counter and remove 2 from likes
counter. Post.update_counters('50e0edd97c71c17ea9000001', :comments_count => 5, :likes_count => -2)
@param [ String ] id The id of the object to update. @param [ Hash ] counters
@since 3.1.0
# File lib/mongoid/association/referenced/counter_cache.rb, line 60 def update_counters(id, counters) where(:_id => id).inc(counters) end