# frozen_string_literal: true

require "cases/helper"
require "support/schema_dumping_helper"

if ActiveRecord::Base.connection.supports_foreign_keys?
  module ActiveRecord
    class Migration
      class ForeignKeyInCreateTest < ActiveRecord::TestCase
        def test_foreign_keys
          foreign_keys = ActiveRecord::Base.connection.foreign_keys("fk_test_has_fk")
          assert_equal 1, foreign_keys.size

          fk = foreign_keys.first
          assert_equal "fk_test_has_fk", fk.from_table
          assert_equal "fk_test_has_pk", fk.to_table
          assert_equal "fk_id", fk.column
          assert_equal "pk_id", fk.primary_key
          assert_equal "fk_name", fk.name unless current_adapter?(:SQLite3Adapter)
        end
      end

      class ForeignKeyChangeColumnTest < ActiveRecord::TestCase
        self.use_transactional_tests = false

        class Rocket < ActiveRecord::Base
          has_many :astronauts
        end

        class Astronaut < ActiveRecord::Base
          belongs_to :rocket
        end

        class CreateRocketsMigration < ActiveRecord::Migration::Current
          def change
            create_table :rockets do |t|
              t.string :name
            end

            create_table :astronauts do |t|
              t.string :name
              t.references :rocket, foreign_key: true
            end
          end
        end

        def setup
          @connection = ActiveRecord::Base.connection
          @migration = CreateRocketsMigration.new
          silence_stream($stdout) { @migration.migrate(:up) }
          Rocket.reset_table_name
          Rocket.reset_column_information
          Astronaut.reset_table_name
          Astronaut.reset_column_information
        end

        def teardown
          silence_stream($stdout) { @migration.migrate(:down) }
          Rocket.reset_table_name
          Rocket.reset_column_information
          Astronaut.reset_table_name
          Astronaut.reset_column_information
        end

        def test_change_column_of_parent_table
          rocket = Rocket.create!(name: "myrocket")
          rocket.astronauts << Astronaut.create!

          @connection.change_column_null Rocket.table_name, :name, false

          foreign_keys = @connection.foreign_keys(Astronaut.table_name)
          assert_equal 1, foreign_keys.size

          fk = foreign_keys.first
          assert_equal "myrocket", Rocket.first.name
          assert_equal Astronaut.table_name, fk.from_table
          assert_equal Rocket.table_name, fk.to_table
        end

        def test_rename_column_of_child_table
          rocket = Rocket.create!(name: "myrocket")
          rocket.astronauts << Astronaut.create!

          @connection.rename_column Astronaut.table_name, :name, :astronaut_name

          foreign_keys = @connection.foreign_keys(Astronaut.table_name)
          assert_equal 1, foreign_keys.size

          fk = foreign_keys.first
          assert_equal "myrocket", Rocket.first.name
          assert_equal Astronaut.table_name, fk.from_table
          assert_equal Rocket.table_name, fk.to_table
        end

        def test_rename_reference_column_of_child_table
          if current_adapter?(:Mysql2Adapter) && !@connection.send(:supports_rename_index?)
            skip "Cannot drop index, needed in a foreign key constraint"
          end

          rocket = Rocket.create!(name: "myrocket")
          rocket.astronauts << Astronaut.create!

          @connection.rename_column Astronaut.table_name, :rocket_id, :new_rocket_id

          foreign_keys = @connection.foreign_keys(Astronaut.table_name)
          assert_equal 1, foreign_keys.size

          fk = foreign_keys.first
          assert_equal "myrocket", Rocket.first.name
          assert_equal Astronaut.table_name, fk.from_table
          assert_equal Rocket.table_name, fk.to_table
          assert_equal "new_rocket_id", fk.options[:column]
        end

        def test_remove_reference_column_of_child_table
          rocket = Rocket.create!(name: "myrocket")
          rocket.astronauts << Astronaut.create!

          @connection.remove_column Astronaut.table_name, :rocket_id

          assert_empty @connection.foreign_keys(Astronaut.table_name)
        end

        def test_remove_foreign_key_by_column
          rocket = Rocket.create!(name: "myrocket")
          rocket.astronauts << Astronaut.create!

          @connection.remove_foreign_key Astronaut.table_name, column: :rocket_id

          assert_empty @connection.foreign_keys(Astronaut.table_name)
        end

        def test_remove_foreign_key_by_column_in_change_table
          rocket = Rocket.create!(name: "myrocket")
          rocket.astronauts << Astronaut.create!

          @connection.change_table Astronaut.table_name do |t|
            t.remove_foreign_key column: :rocket_id
          end

          assert_empty @connection.foreign_keys(Astronaut.table_name)
        end
      end

      class ForeignKeyChangeColumnWithPrefixTest < ForeignKeyChangeColumnTest
        setup do
          ActiveRecord::Base.table_name_prefix = "p_"
        end

        teardown do
          ActiveRecord::Base.table_name_prefix = nil
        end
      end

      class ForeignKeyChangeColumnWithSuffixTest < ForeignKeyChangeColumnTest
        setup do
          ActiveRecord::Base.table_name_suffix = "_s"
        end

        teardown do
          ActiveRecord::Base.table_name_suffix = nil
        end
      end
    end
  end

  module ActiveRecord
    class Migration
      class ForeignKeyTest < ActiveRecord::TestCase
        include SchemaDumpingHelper
        include ActiveSupport::Testing::Stream

        class Rocket < ActiveRecord::Base
        end

        class Astronaut < ActiveRecord::Base
        end

        setup do
          @connection = ActiveRecord::Base.connection
          @connection.create_table "rockets", force: true do |t|
            t.string :name
          end

          @connection.create_table "astronauts", force: true do |t|
            t.string :name
            t.references :rocket
          end
        end

        teardown do
          @connection.drop_table "astronauts", if_exists: true rescue nil
          @connection.drop_table "rockets", if_exists: true rescue nil
        end

        def test_foreign_keys
          foreign_keys = @connection.foreign_keys("fk_test_has_fk")
          assert_equal 1, foreign_keys.size

          fk = foreign_keys.first
          assert_equal "fk_test_has_fk", fk.from_table
          assert_equal "fk_test_has_pk", fk.to_table
          assert_equal "fk_id", fk.column
          assert_equal "pk_id", fk.primary_key
          assert_equal "fk_name", fk.name unless current_adapter?(:SQLite3Adapter)
        end

        def test_add_foreign_key_inferes_column
          @connection.add_foreign_key :astronauts, :rockets

          foreign_keys = @connection.foreign_keys("astronauts")
          assert_equal 1, foreign_keys.size

          fk = foreign_keys.first
          assert_equal "astronauts", fk.from_table
          assert_equal "rockets", fk.to_table
          assert_equal "rocket_id", fk.column
          assert_equal "id", fk.primary_key
          assert_equal "fk_rails_78146ddd2e", fk.name unless current_adapter?(:SQLite3Adapter)
        end

        def test_add_foreign_key_with_column
          @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id"

          foreign_keys = @connection.foreign_keys("astronauts")
          assert_equal 1, foreign_keys.size

          fk = foreign_keys.first
          assert_equal "astronauts", fk.from_table
          assert_equal "rockets", fk.to_table
          assert_equal "rocket_id", fk.column
          assert_equal "id", fk.primary_key
          assert_equal "fk_rails_78146ddd2e", fk.name unless current_adapter?(:SQLite3Adapter)
        end

        def test_add_foreign_key_with_non_standard_primary_key
          @connection.create_table :space_shuttles, id: false, force: true do |t|
            t.bigint :pk, primary_key: true
          end

          @connection.add_foreign_key(:astronauts, :space_shuttles,
            column: "rocket_id", primary_key: "pk", name: "custom_pk")

          foreign_keys = @connection.foreign_keys("astronauts")
          assert_equal 1, foreign_keys.size

          fk = foreign_keys.first
          assert_equal "astronauts", fk.from_table
          assert_equal "space_shuttles", fk.to_table
          assert_equal "pk", fk.primary_key
        ensure
          @connection.remove_foreign_key :astronauts, name: "custom_pk", to_table: "space_shuttles"
          @connection.drop_table :space_shuttles
        end

        def test_add_on_delete_restrict_foreign_key
          @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", on_delete: :restrict

          foreign_keys = @connection.foreign_keys("astronauts")
          assert_equal 1, foreign_keys.size

          fk = foreign_keys.first
          if current_adapter?(:Mysql2Adapter)
            # ON DELETE RESTRICT is the default on MySQL
            assert_nil fk.on_delete
          else
            assert_equal :restrict, fk.on_delete
          end
        end

        def test_add_on_delete_cascade_foreign_key
          @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", on_delete: :cascade

          foreign_keys = @connection.foreign_keys("astronauts")
          assert_equal 1, foreign_keys.size

          fk = foreign_keys.first
          assert_equal :cascade, fk.on_delete
        end

        def test_add_on_delete_nullify_foreign_key
          @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", on_delete: :nullify

          foreign_keys = @connection.foreign_keys("astronauts")
          assert_equal 1, foreign_keys.size

          fk = foreign_keys.first
          assert_equal :nullify, fk.on_delete
        end

        def test_on_update_and_on_delete_raises_with_invalid_values
          assert_raises ArgumentError do
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", on_delete: :invalid
          end

          assert_raises ArgumentError do
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", on_update: :invalid
          end
        end

        def test_add_foreign_key_with_on_update
          @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", on_update: :nullify

          foreign_keys = @connection.foreign_keys("astronauts")
          assert_equal 1, foreign_keys.size

          fk = foreign_keys.first
          assert_equal :nullify, fk.on_update
        end

        def test_add_foreign_key_with_non_existent_from_table_raises
          e = assert_raises StatementInvalid do
            @connection.add_foreign_key :missions, :rockets
          end
          assert_match(/missions/, e.message)
        end

        def test_add_foreign_key_with_non_existent_to_table_raises
          e = assert_raises StatementInvalid do
            @connection.add_foreign_key :missions, :rockets
          end
          assert_match(/missions/, e.message)
        end

        def test_foreign_key_exists
          @connection.add_foreign_key :astronauts, :rockets

          assert @connection.foreign_key_exists?(:astronauts, :rockets)
          assert_not @connection.foreign_key_exists?(:astronauts, :stars)
        end

        def test_foreign_key_exists_referencing_table_having_keyword_as_name
          @connection.create_table :user, force: true
          @connection.add_column :rockets, :user_id, :bigint
          @connection.add_foreign_key :rockets, :user
          assert @connection.foreign_key_exists?(:rockets, :user)
        ensure
          @connection.remove_foreign_key :rockets, :user
          @connection.drop_table :user
        end

        def test_foreign_key_exists_by_column
          @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id"

          assert @connection.foreign_key_exists?(:astronauts, column: "rocket_id")
          assert_not @connection.foreign_key_exists?(:astronauts, column: "star_id")
        end

        def test_foreign_key_exists_by_name
          skip if current_adapter?(:SQLite3Adapter)

          @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", name: "fancy_named_fk"

          assert @connection.foreign_key_exists?(:astronauts, name: "fancy_named_fk")
          assert_not @connection.foreign_key_exists?(:astronauts, name: "other_fancy_named_fk")
        end

        def test_foreign_key_exists_in_change_table
          @connection.change_table(:astronauts) do |t|
            t.foreign_key :rockets, column: "rocket_id", name: "fancy_named_fk"

            assert t.foreign_key_exists?(column: "rocket_id")
            assert_not t.foreign_key_exists?(column: "star_id")

            unless current_adapter?(:SQLite3Adapter)
              assert t.foreign_key_exists?(name: "fancy_named_fk")
              assert_not t.foreign_key_exists?(name: "other_fancy_named_fk")
            end
          end
        end

        def test_remove_foreign_key_inferes_column
          @connection.add_foreign_key :astronauts, :rockets

          assert_equal 1, @connection.foreign_keys("astronauts").size
          @connection.remove_foreign_key :astronauts, :rockets
          assert_equal [], @connection.foreign_keys("astronauts")
        end

        def test_remove_foreign_key_by_column
          @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id"

          assert_equal 1, @connection.foreign_keys("astronauts").size
          @connection.remove_foreign_key :astronauts, column: "rocket_id"
          assert_equal [], @connection.foreign_keys("astronauts")
        end

        def test_remove_foreign_key_by_symbol_column
          @connection.add_foreign_key :astronauts, :rockets, column: :rocket_id

          assert_equal 1, @connection.foreign_keys("astronauts").size
          @connection.remove_foreign_key :astronauts, column: :rocket_id
          assert_equal [], @connection.foreign_keys("astronauts")
        end

        def test_remove_foreign_key_by_name
          skip if current_adapter?(:SQLite3Adapter)

          @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", name: "fancy_named_fk"

          assert_equal 1, @connection.foreign_keys("astronauts").size
          @connection.remove_foreign_key :astronauts, name: "fancy_named_fk"
          assert_equal [], @connection.foreign_keys("astronauts")
        end

        def test_remove_foreign_non_existing_foreign_key_raises
          e = assert_raises ArgumentError do
            @connection.remove_foreign_key :astronauts, :rockets
          end
          assert_equal "Table 'astronauts' has no foreign key for rockets", e.message
        end

        def test_remove_foreign_key_by_the_select_one_on_the_same_table
          @connection.add_foreign_key :astronauts, :rockets
          @connection.add_reference :astronauts, :myrocket, foreign_key: { to_table: :rockets }

          assert_equal 2, @connection.foreign_keys("astronauts").size

          @connection.remove_foreign_key :astronauts, :rockets, column: "myrocket_id"

          assert_equal [["astronauts", "rockets", "rocket_id"]],
            @connection.foreign_keys("astronauts").map { |fk| [fk.from_table, fk.to_table, fk.column] }
        end

        if ActiveRecord::Base.connection.supports_validate_constraints?
          def test_add_invalid_foreign_key
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", validate: false

            foreign_keys = @connection.foreign_keys("astronauts")
            assert_equal 1, foreign_keys.size

            fk = foreign_keys.first
            assert_not_predicate fk, :validated?
          end

          def test_validate_foreign_key_infers_column
            @connection.add_foreign_key :astronauts, :rockets, validate: false
            assert_not_predicate @connection.foreign_keys("astronauts").first, :validated?

            @connection.validate_foreign_key :astronauts, :rockets
            assert_predicate @connection.foreign_keys("astronauts").first, :validated?
          end

          def test_validate_foreign_key_by_column
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", validate: false
            assert_not_predicate @connection.foreign_keys("astronauts").first, :validated?

            @connection.validate_foreign_key :astronauts, column: "rocket_id"
            assert_predicate @connection.foreign_keys("astronauts").first, :validated?
          end

          def test_validate_foreign_key_by_symbol_column
            @connection.add_foreign_key :astronauts, :rockets, column: :rocket_id, validate: false
            assert_not_predicate @connection.foreign_keys("astronauts").first, :validated?

            @connection.validate_foreign_key :astronauts, column: :rocket_id
            assert_predicate @connection.foreign_keys("astronauts").first, :validated?
          end

          def test_validate_foreign_key_by_name
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", name: "fancy_named_fk", validate: false
            assert_not_predicate @connection.foreign_keys("astronauts").first, :validated?

            @connection.validate_foreign_key :astronauts, name: "fancy_named_fk"
            assert_predicate @connection.foreign_keys("astronauts").first, :validated?
          end

          def test_validate_foreign_non_existing_foreign_key_raises
            assert_raises ArgumentError do
              @connection.validate_foreign_key :astronauts, :rockets
            end
          end

          def test_validate_constraint_by_name
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", name: "fancy_named_fk", validate: false

            @connection.validate_constraint :astronauts, "fancy_named_fk"
            assert_predicate @connection.foreign_keys("astronauts").first, :validated?
          end
        else
          # Foreign key should still be created, but should not be invalid
          def test_add_invalid_foreign_key
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", validate: false

            foreign_keys = @connection.foreign_keys("astronauts")
            assert_equal 1, foreign_keys.size

            fk = foreign_keys.first
            assert_predicate fk, :validated?
          end
        end

        if ActiveRecord::Base.connection.supports_deferrable_constraints?
          def test_deferrable_foreign_key
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", deferrable: true

            foreign_keys = @connection.foreign_keys("astronauts")
            assert_equal 1, foreign_keys.size

            fk = foreign_keys.first
            assert_equal true, fk.options[:deferrable]
          end

          def test_not_deferrable_foreign_key
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", deferrable: false

            foreign_keys = @connection.foreign_keys("astronauts")
            assert_equal 1, foreign_keys.size

            fk = foreign_keys.first
            assert_equal false, fk.options[:deferrable]
          end

          def test_deferrable_initially_deferred_foreign_key
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", deferrable: :deferred

            foreign_keys = @connection.foreign_keys("astronauts")
            assert_equal 1, foreign_keys.size

            fk = foreign_keys.first
            assert_equal :deferred, fk.options[:deferrable]
          end

          def test_deferrable_initially_immediate_foreign_key
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", deferrable: :immediate

            foreign_keys = @connection.foreign_keys("astronauts")
            assert_equal 1, foreign_keys.size

            fk = foreign_keys.first
            assert_equal true, fk.options[:deferrable]
          end

          def test_schema_dumping_with_defferable
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", deferrable: true

            output = dump_table_schema "astronauts"

            assert_match %r{\s+add_foreign_key "astronauts", "rockets", deferrable: true$}, output
          end

          def test_schema_dumping_with_disabled_defferable
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", deferrable: false

            output = dump_table_schema "astronauts"

            assert_match %r{\s+add_foreign_key "astronauts", "rockets"$}, output
          end

          def test_schema_dumping_with_defferable_initially_deferred
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", deferrable: :deferred

            output = dump_table_schema "astronauts"

            assert_match %r{\s+add_foreign_key "astronauts", "rockets", deferrable: :deferred$}, output
          end

          def test_schema_dumping_with_defferable_initially_immediate
            @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", deferrable: :immediate

            output = dump_table_schema "astronauts"

            assert_match %r{\s+add_foreign_key "astronauts", "rockets", deferrable: true$}, output
          end
        end

        def test_schema_dumping
          @connection.add_foreign_key :astronauts, :rockets
          output = dump_table_schema "astronauts"
          assert_match %r{\s+add_foreign_key "astronauts", "rockets"$}, output
        end

        def test_schema_dumping_with_options
          output = dump_table_schema "fk_test_has_fk"
          if current_adapter?(:SQLite3Adapter)
            assert_match %r{\s+add_foreign_key "fk_test_has_fk", "fk_test_has_pk", column: "fk_id", primary_key: "pk_id"$}, output
          else
            assert_match %r{\s+add_foreign_key "fk_test_has_fk", "fk_test_has_pk", column: "fk_id", primary_key: "pk_id", name: "fk_name"$}, output
          end
        end

        def test_schema_dumping_with_custom_fk_ignore_pattern
          original_pattern = ActiveRecord::SchemaDumper.fk_ignore_pattern
          ActiveRecord::SchemaDumper.fk_ignore_pattern = /^ignored_/
          @connection.add_foreign_key :astronauts, :rockets, name: :ignored_fk_astronauts_rockets

          output = dump_table_schema "astronauts"
          assert_match %r{\s+add_foreign_key "astronauts", "rockets"$}, output

          ActiveRecord::SchemaDumper.fk_ignore_pattern = original_pattern
        end

        def test_schema_dumping_on_delete_and_on_update_options
          @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", on_delete: :nullify, on_update: :cascade

          output = dump_table_schema "astronauts"
          assert_match %r{\s+add_foreign_key "astronauts",.+on_update: :cascade,.+on_delete: :nullify$}, output
        end

        class CreateCitiesAndHousesMigration < ActiveRecord::Migration::Current
          def change
            create_table("cities") { |t| }

            create_table("houses") do |t|
              t.references :city
            end
            add_foreign_key :houses, :cities, column: "city_id"

            # remove and re-add to test that schema is updated and not accidentally cached
            remove_foreign_key :houses, :cities
            add_foreign_key :houses, :cities, column: "city_id", on_delete: :cascade
          end
        end

        def test_add_foreign_key_is_reversible
          migration = CreateCitiesAndHousesMigration.new
          silence_stream($stdout) { migration.migrate(:up) }
          assert_equal 1, @connection.foreign_keys("houses").size
        ensure
          silence_stream($stdout) { migration.migrate(:down) }
        end

        def test_foreign_key_constraint_is_not_cached_incorrectly
          migration = CreateCitiesAndHousesMigration.new
          silence_stream($stdout) { migration.migrate(:up) }
          output = dump_table_schema "houses"
          assert_match %r{\s+add_foreign_key "houses",.+on_delete: :cascade$}, output
        ensure
          silence_stream($stdout) { migration.migrate(:down) }
        end

        class CreateSchoolsAndClassesMigration < ActiveRecord::Migration::Current
          def change
            create_table(:schools)

            create_table(:classes) do |t|
              t.references :school
            end
            add_foreign_key :classes, :schools, validate: true
          end
        end

        def test_add_foreign_key_with_prefix
          ActiveRecord::Base.table_name_prefix = "p_"
          migration = CreateSchoolsAndClassesMigration.new
          silence_stream($stdout) { migration.migrate(:up) }
          assert_equal 1, @connection.foreign_keys("p_classes").size
        ensure
          silence_stream($stdout) { migration.migrate(:down) }
          ActiveRecord::Base.table_name_prefix = nil
        end

        def test_add_foreign_key_with_suffix
          ActiveRecord::Base.table_name_suffix = "_s"
          migration = CreateSchoolsAndClassesMigration.new
          silence_stream($stdout) { migration.migrate(:up) }
          assert_equal 1, @connection.foreign_keys("classes_s").size
        ensure
          silence_stream($stdout) { migration.migrate(:down) }
          ActiveRecord::Base.table_name_suffix = nil
        end

        def test_remove_foreign_key_with_if_exists_not_set
          @connection.add_foreign_key :astronauts, :rockets
          assert_equal 1, @connection.foreign_keys("astronauts").size

          @connection.remove_foreign_key :astronauts, :rockets
          assert_equal [], @connection.foreign_keys("astronauts")

          error = assert_raises do
            @connection.remove_foreign_key :astronauts, :rockets
          end

          assert_equal("Table 'astronauts' has no foreign key for rockets", error.message)
        end

        def test_remove_foreign_key_with_if_exists_set
          @connection.add_foreign_key :astronauts, :rockets
          assert_equal 1, @connection.foreign_keys("astronauts").size

          @connection.remove_foreign_key :astronauts, :rockets, if_exists: true
          assert_equal [], @connection.foreign_keys("astronauts")

          assert_nothing_raised do
            @connection.remove_foreign_key :astronauts, :rockets, if_exists: true
          end
        end

        def test_add_foreign_key_with_if_not_exists_not_set
          @connection.add_foreign_key :astronauts, :rockets
          assert_equal 1, @connection.foreign_keys("astronauts").size

          if current_adapter?(:SQLite3Adapter)
            assert_nothing_raised do
              @connection.add_foreign_key :astronauts, :rockets
            end
          else
            error = assert_raises do
              @connection.add_foreign_key :astronauts, :rockets
            end

            if current_adapter?(:Mysql2Adapter)
              if ActiveRecord::Base.connection.mariadb?
                assert_match(/Duplicate key on write or update/, error.message)
              elsif ActiveRecord::Base.connection.database_version < "5.6"
                assert_match(/Can't create table/, error.message)
              elsif ActiveRecord::Base.connection.database_version < "8.0"
                assert_match(/Can't write; duplicate key in table/, error.message)
              else
                assert_match(/Duplicate foreign key constraint name/, error.message)
              end
            else
              assert_match(/PG::DuplicateObject: ERROR:.*for relation "astronauts" already exists/, error.message)
            end

          end
        end

        def test_add_foreign_key_with_if_not_exists_set
          @connection.add_foreign_key :astronauts, :rockets
          assert_equal 1, @connection.foreign_keys("astronauts").size

          assert_nothing_raised do
            @connection.add_foreign_key :astronauts, :rockets, if_not_exists: true
          end
        end
      end
    end
  end
end
