method

reset_counters

v3.2.13 - Show latest stable - 0 notes - Class: ActiveRecord::CounterCache

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What's this?

reset_counters(id, *counters) public

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_count
Post.reset_counters(1, :comments)

Show source

# 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)

        if has_many_association.options[:as]
          has_many_association.options[:as].to_s.classify
        else
          self.name
        end

        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
        })
        connection.update stmt
      end
      return true
    end

reset_counters

Related methods

Parameters

Examples