# Monkey patch composite_primary_keys pending the resolution of:
# https://github.com/composite-primary-keys/composite_primary_keys/pull/170
module ActiveRecord
  module Associations
    class HasManyAssociation
      def delete_records(records, method)
        if method == :destroy
          records.each { |r| r.destroy }
          update_counter(-records.length) unless inverse_updates_counter_cache?
        else
          if records == :all
            scope = self.scope
          else
            # CPK
            # keys  = records.map { |r| r[reflection.association_primary_key] }
            # scope = scope.where(reflection.association_primary_key => keys)
            table = Arel::Table.new(reflection.table_name)
            and_conditions = records.map do |record|
              eq_conditions = Array(reflection.association_primary_key).map do |name|
                table[name].eq(record[name])
              end
              Arel::Nodes::And.new(eq_conditions)
            end

            condition = and_conditions.shift
            and_conditions.each do |and_condition|
              condition = condition.or(and_condition)
            end

            scope = self.scope.where(condition)
          end

          if method == :delete_all
            update_counter(-scope.delete_all)
          else
            # CPK
            # update_counter(-scope.update_all(reflection.foreign_key => nil))
            updates = Array(reflection.foreign_key).inject(Hash.new) do |hash, name|
              hash[name] = nil
              hash
            end
            update_counter(-scope.update_all(updates))
          end
        end
      end
    end
  end
end