method

partition_overwrites

v4.0.2 - Show latest stable - 0 notes - Class: Merger

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What's this?

partition_overwrites(lhs_wheres, rhs_wheres) private

Remove equalities from the existing relation with a LHS which is present in the relation being merged in. returns [things_to_remove, things_to_keep]

Show source

# File activerecord/lib/active_record/relation/merger.rb, line 147
      def partition_overwrites(lhs_wheres, rhs_wheres)
        if lhs_wheres.empty? || rhs_wheres.empty?
          return [[], lhs_wheres]
        end

        nodes = rhs_wheres.find_all do |w|
          w.respond_to?(:operator) && w.operator == :==
        end
        seen = Set.new(nodes) { |node| node.left }

        lhs_wheres.partition do |w|
          w.respond_to?(:operator) && w.operator == :== && seen.include?(w.left)
        end
      end

partition_overwrites

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