instance method
reset_counters
Ruby on Rails 4.0.13
Since v4.0.13Signature
reset_counters(id, *counters)Resets one or more counter caches to their correct value using an SQL count query. This is useful when adding new counter caches, or if the counter has been corrupted or modified directly by SQL.
Parameters
-
id- The id of the object you wish to reset a counter on. -
counters- One or more association counters to reset
Examples
# For Post with id #1 records reset the comments_count Post.reset_counters(1, :comments)
Parameters
-
idreq -
countersrest
Source
# File activerecord/lib/active_record/counter_cache.rb, line 20
def reset_counters(id, *counters)
object = find(id)
counters.each do |association|
has_many_association = reflect_on_association(association.to_sym)
raise ArgumentError, "'#{self.name}' has no association called '#{association}'" unless has_many_association
if has_many_association.is_a? ActiveRecord::Reflection::ThroughReflection
has_many_association = has_many_association.through_reflection
end
foreign_key = has_many_association.foreign_key.to_s
child_class = has_many_association.klass
belongs_to = child_class.reflect_on_all_associations(:belongs_to)
reflection = belongs_to.find { |e| e.foreign_key.to_s == foreign_key && e.options[:counter_cache].present? }
counter_name = reflection.counter_cache_column
stmt = unscoped.where(arel_table[primary_key].eq(object.id)).arel.compile_update({
arel_table[counter_name] => object.send(association).count(:all)
})
connection.update stmt
end
return true
end
Defined in activerecord/lib/active_record/counter_cache.rb line 20
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Defined in ActiveRecord::CounterCache::ClassMethods