method

preloaders_for_one

v5.1.7 - Show latest stable - 0 notes - Class: Preloader

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What's this?

preloaders_for_one(association, records, scope) private

Loads all the given data into records for a singular association.

Functions by instantiating a preloader class such as Preloader::HasManyThrough and call the run method for each passed in class in the records argument.

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 147
        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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