method

preloaders_for_one

v4.2.1 - Show latest stable - 0 notes - Class: Preloader

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What's this?

preloaders_for_one(association, records, scope) private

Not all records have the same class, so group then preload group on the reflection itself so that if various subclass share the same association then we do not split them unnecessarily

Additionally, polymorphic belongs_to associations can have multiple associated classes, depending on the polymorphic_type field. So we group by the classes as well.

Show source

# File activerecord/lib/active_record/associations/preloader.rb, line 142
      def preloaders_for_one(association, records, scope)
        grouped_records(association, records).flat_map do |reflection, klasses|
          klasses.map do |rhs_klass, rs|
            loader = preloader_for(reflection, rs, rhs_klass).new(rhs_klass, rs, reflection, scope)
            loader.run self
            loader
          end
        end
      end

preloaders_for_one

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