method

query_constraints

v7.1.3.2 - Show latest stable - 0 notes - Class: ClassMethods

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What's this?

query_constraints(*columns_list) public

Accepts a list of attribute names to be used in the WHERE clause of SELECT / UPDATE / DELETE queries and in the ORDER BY clause for `#first` and `#last` finder methods.

class Developer < ActiveRecord::Base
  query_constraints :company_id, :id
end

developer = Developer.first
# SELECT "developers".* FROM "developers" ORDER BY "developers"."company_id" ASC, "developers"."id" ASC LIMIT 1
developer.inspect # => #<Developer id: 1, company_id: 1, ...>

developer.update!(name: "Nikita")
# UPDATE "developers" SET "name" = 'Nikita' WHERE "developers"."company_id" = 1 AND "developers"."id" = 1

It is possible to update attribute used in the query_by clause:
developer.update!(company_id: 2)
# UPDATE "developers" SET "company_id" = 2 WHERE "developers"."company_id" = 1 AND "developers"."id" = 1

developer.name = "Bob"
developer.save!
# UPDATE "developers" SET "name" = 'Bob' WHERE "developers"."company_id" = 1 AND "developers"."id" = 1

developer.destroy!
# DELETE FROM "developers" WHERE "developers"."company_id" = 1 AND "developers"."id" = 1

developer.delete
# DELETE FROM "developers" WHERE "developers"."company_id" = 1 AND "developers"."id" = 1

developer.reload
# SELECT "developers".* FROM "developers" WHERE "developers"."company_id" = 1 AND "developers"."id" = 1 LIMIT 1

Show source

# File activerecord/lib/active_record/persistence.rb, line 488
      def query_constraints(*columns_list)
        raise ArgumentError, "You must specify at least one column to be used in querying" if columns_list.empty?

        @query_constraints_list = columns_list.map(&:to_s)
        @has_query_constraints = @query_constraints_list
      end

query_constraints

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