1 files changed, 170 insertions, 0 deletions
diff --git a/activerecord/test/cases/migration/references_foreign_key_test.rb b/activerecord/test/cases/migration/references_foreign_key_test.rb
new file mode 100644
index 0000000000..84ec657398
--- /dev/null
+++ b/activerecord/test/cases/migration/references_foreign_key_test.rb
@@ -0,0 +1,170 @@
+require 'cases/helper'
+
+if ActiveRecord::Base.connection.supports_foreign_keys?
+module ActiveRecord
+  class Migration
+    class ReferencesForeignKeyTest < ActiveRecord::TestCase
+      setup do
+        @connection = ActiveRecord::Base.connection
+        @connection.create_table(:testing_parents, force: true)
+      end
+
+      teardown do
+        @connection.drop_table "testings", if_exists: true
+        @connection.drop_table "testing_parents", if_exists: true
+      end
+
+      test "foreign keys can be created with the table" do
+        @connection.create_table :testings do |t|
+          t.references :testing_parent, foreign_key: true
+        end
+
+        fk = @connection.foreign_keys("testings").first
+        assert_equal "testings", fk.from_table
+        assert_equal "testing_parents", fk.to_table
+      end
+
+      test "no foreign key is created by default" do
+        @connection.create_table :testings do |t|
+          t.references :testing_parent
+        end
+
+        assert_equal [], @connection.foreign_keys("testings")
+      end
+
+      test "foreign keys can be created in one query" do
+        assert_queries(1) do
+          @connection.create_table :testings do |t|
+            t.references :testing_parent, foreign_key: true
+          end
+        end
+      end
+
+      test "options hash can be passed" do
+        @connection.change_table :testing_parents do |t|
+          t.integer :other_id
+          t.index :other_id, unique: true
+        end
+        @connection.create_table :testings do |t|
+          t.references :testing_parent, foreign_key: { primary_key: :other_id }
+        end
+
+        fk = @connection.foreign_keys("testings").find { |k| k.to_table == "testing_parents" }
+        assert_equal "other_id", fk.primary_key
+      end
+
+      test "to_table option can be passed" do
+        @connection.create_table :testings do |t|
+          t.references :parent, foreign_key: { to_table: :testing_parents }
+        end
+        fks = @connection.foreign_keys("testings")
+        assert_equal([["testings", "testing_parents", "parent_id"]],
+                     fks.map {|fk| [fk.from_table, fk.to_table, fk.column] })
+      end
+
+      test "foreign keys cannot be added to polymorphic relations when creating the table" do
+        @connection.create_table :testings do |t|
+          assert_raises(ArgumentError) do
+            t.references :testing_parent, polymorphic: true, foreign_key: true
+          end
+        end
+      end
+
+      test "foreign keys can be created while changing the table" do
+        @connection.create_table :testings
+        @connection.change_table :testings do |t|
+          t.references :testing_parent, foreign_key: true
+        end
+
+        fk = @connection.foreign_keys("testings").first
+        assert_equal "testings", fk.from_table
+        assert_equal "testing_parents", fk.to_table
+      end
+
+      test "foreign keys are not added by default when changing the table" do
+        @connection.create_table :testings
+        @connection.change_table :testings do |t|
+          t.references :testing_parent
+        end
+
+        assert_equal [], @connection.foreign_keys("testings")
+      end
+
+      test "foreign keys accept options when changing the table" do
+        @connection.change_table :testing_parents do |t|
+          t.integer :other_id
+          t.index :other_id, unique: true
+        end
+        @connection.create_table :testings
+        @connection.change_table :testings do |t|
+          t.references :testing_parent, foreign_key: { primary_key: :other_id }
+        end
+
+        fk = @connection.foreign_keys("testings").find { |k| k.to_table == "testing_parents" }
+        assert_equal "other_id", fk.primary_key
+      end
+
+      test "foreign keys cannot be added to polymorphic relations when changing the table" do
+        @connection.create_table :testings
+        @connection.change_table :testings do |t|
+          assert_raises(ArgumentError) do
+            t.references :testing_parent, polymorphic: true, foreign_key: true
+          end
+        end
+      end
+
+      test "foreign key column can be removed" do
+        @connection.create_table :testings do |t|
+          t.references :testing_parent, index: true, foreign_key: true
+        end
+
+        assert_difference "@connection.foreign_keys('testings').size", -1 do
+          @connection.remove_reference :testings, :testing_parent, foreign_key: true
+        end
+      end
+
+      test "foreign key methods respect pluralize_table_names" do
+        begin
+          original_pluralize_table_names = ActiveRecord::Base.pluralize_table_names
+          ActiveRecord::Base.pluralize_table_names = false
+          @connection.create_table :testing
+          @connection.change_table :testing_parents do |t|
+            t.references :testing, foreign_key: true
+          end
+
+          fk = @connection.foreign_keys("testing_parents").first
+          assert_equal "testing_parents", fk.from_table
+          assert_equal "testing", fk.to_table
+
+          assert_difference "@connection.foreign_keys('testing_parents').size", -1 do
+            @connection.remove_reference :testing_parents, :testing, foreign_key: true
+          end
+        ensure
+          ActiveRecord::Base.pluralize_table_names = original_pluralize_table_names
+          @connection.drop_table "testing", if_exists: true
+        end
+      end
+    end
+  end
+end
+else
+class ReferencesWithoutForeignKeySupportTest < ActiveRecord::TestCase
+  setup do
+    @connection = ActiveRecord::Base.connection
+    @connection.create_table(:testing_parents, force: true)
+  end
+
+  teardown do
+    @connection.drop_table("testings", if_exists: true)
+    @connection.drop_table("testing_parents", if_exists: true)
+  end
+
+  test "ignores foreign keys defined with the table" do
+    @connection.create_table :testings do |t|
+      t.references :testing_parent, foreign_key: true
+    end
+
+    assert_includes @connection.tables, "testings"
+  end
+end
+end