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 counter names to reset
Examples
# For Post with id #1 records reset the comments_countPost.reset_counters(1,:comments)
# File activerecord/lib/active_record/counter_cache.rb, line 17
def reset_counters(id, *counters)
object = find(id)
counters.each do |association|
has_many_association = reflect_on_association(association.to_sym)
expected_name = if has_many_association.options[:as]
has_many_association.options[:as].to_s.classify
else
self.name
end
child_class = has_many_association.klass
belongs_to = child_class.reflect_on_all_associations(:belongs_to)
reflection = belongs_to.find { |e| e.class_name == expected_name }
counter_name = reflection.counter_cache_column
self.unscoped.where(arel_table[self.primary_key].eq(object.id)).arel.update({
arel_table[counter_name] => object.send(association).count
})
end
return true
end