method

construct_id_map

v2.3.8 - Show latest stable - 0 notes - Class: ActiveRecord::AssociationPreload::ClassMethods

1.0.0
1.1.0
1.1.1
1.1.6
1.2.0
1.2.6
2.0.0
2.0.1
2.0.3
2.1.0 (0)
2.2.1 (38)
2.3.2 (0)
2.3.8 (0)
3.0.0 (0)
3.0.5 (0)
3.0.7 (0)
3.0.9 (-1)
3.1.0
3.2.1
3.2.3
3.2.8
3.2.13
What's this?

construct_id_map(records, primary_key=nil) private

Given a collection of ActiveRecord objects, constructs a Hash which maps the objects’ IDs to the relevant objects. Returns a 2-tuple (id_to_record_map, ids) where id_to_record_map is the Hash, and ids is an Array of record IDs.

Show source

# File activerecord/lib/active_record/association_preload.rb, line 171
      def construct_id_map(records, primary_key=nil)
        id_to_record_map = {}
        ids = []
        records.each do |record|
          primary_key ||= record.class.primary_key
          ids << record[primary_key]
          mapped_records = (id_to_record_map[ids.last.to_s] ||= [])
          mapped_records << record
        end
        ids.uniq!
        return id_to_record_map, ids
      end

construct_id_map

Related methods

Flowdock - Team Inbox With Chat