Decrement the counter name from the entries that match the id by one. This method is used on associations callbacks when counter_cache is enable
@example Decrement comments counter
Post.decrement_counter(:comments_count, '50e0edd97c71c17ea9000001')
@param [ Symbol ] Counter cache name @param [ String ] The id of the object that will be reset.
@since 3.1.0
# File lib/mongoid/relations/counter_cache.rb, line 73 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 enable
@example Increment comments counter
Post.increment_counter(:comments_count, '50e0edd97c71c17ea9000001')
@param [ Symbol ] Counter cache name @param [ String ] The id of the object that will be reset.
@since 3.1.0
# File lib/mongoid/relations/counter_cache.rb, line 58 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 ] The id of the object that will be reset. @param [ Symbol, Array ] One or more counter caches to reset
@since 3.1.0
# File lib/mongoid/relations/counter_cache.rb, line 19 def reset_counters(id, *counters) object = find(id) counters.each do |name| meta = reflect_on_association(name) inverse = meta.klass.reflect_on_association(meta.inverse) counter_name = inverse.counter_cache_column_name object.update_attribute(counter_name, object.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 ] The id of the object to update. @param [ Hash ] Key = counter_cahe and Value = factor.
@since 3.1.0
# File lib/mongoid/relations/counter_cache.rb, line 41 def update_counters(id, counters) counters.map do |key, value| where(:_id => id).inc(key, value) end end
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