method

size

v2.2.1 - Show latest stable - 0 notes - Class: ActiveRecord::Associations::AssociationCollection

1.0.0
1.1.6
1.2.6
2.0.3
2.1.0 (0)
2.2.1 (13)
2.3.8 (0)
3.0.0 (0)
3.0.9 (-2)
3.1.0
3.2.1
3.2.8
3.2.13
4.0.2
4.1.8
4.2.1
4.2.7
4.2.9
5.0.0.1
5.1.7
5.2.3
6.0.0
6.1.3.1
6.1.7.7
7.0.0
7.1.3.2
7.1.3.4
What's this?

size() public

Returns the size of the collection by executing a SELECT COUNT(*) query if the collection hasn’t been loaded, and calling collection.size if it has.

If the collection has been already loaded size and length are equivalent. If not and you are going to need the records anyway length will take one less query. Otherwise size is more efficient.

This method is abstract in the sense that it relies on count_records, which is a method descendants have to provide.

Show source

# File activerecord/lib/active_record/associations/association_collection.rb, line 259
      def size
        if @owner.new_record? || (loaded? && !@reflection.options[:uniq])
          @target.size
        elsif !loaded? && @reflection.options[:group]
          load_target.size
        elsif !loaded? && !@reflection.options[:uniq] && @target.is_a?(Array)
          unsaved_records = @target.select { |r| r.new_record? }
          unsaved_records.size + count_records
        else
          count_records
        end
      end

size

Related methods