Add an invert method for remove_foreign_key

1 files changed, 30 insertions, 1 deletions

diff --git a/activerecord/test/cases/migration/command_recorder_test.rb b/activerecord/test/cases/migration/command_recorder_test.rb
index 3844b1a92e..24d3c085a7 100644
--- a/activerecord/test/cases/migration/command_recorder_test.rb
+++ b/activerecord/test/cases/migration/command_recorder_test.rb
@@ -281,17 +281,42 @@ module ActiveRecord
         assert_equal [:remove_foreign_key, [:dogs, :people]], enable
       end
 
+      def test_invert_remove_foreign_key
+        enable = @recorder.inverse_of :remove_foreign_key, [:dogs, :people]
+        assert_equal [:add_foreign_key, [:dogs, :people]], enable
+      end
+
       def test_invert_add_foreign_key_with_column
         enable = @recorder.inverse_of :add_foreign_key, [:dogs, :people, column: "owner_id"]
         assert_equal [:remove_foreign_key, [:dogs, column: "owner_id"]], enable
       end
 
+      def test_invert_remove_foreign_key_with_column
+        enable = @recorder.inverse_of :remove_foreign_key, [:dogs, :people, column: "owner_id"]
+        assert_equal [:add_foreign_key, [:dogs, :people, column: "owner_id"]], enable
+      end
+
       def test_invert_add_foreign_key_with_column_and_name
         enable = @recorder.inverse_of :add_foreign_key, [:dogs, :people, column: "owner_id", name: "fk"]
         assert_equal [:remove_foreign_key, [:dogs, name: "fk"]], enable
       end
 
-      def test_remove_foreign_key_is_irreversible
+      def test_invert_remove_foreign_key_with_column_and_name
+        enable = @recorder.inverse_of :remove_foreign_key, [:dogs, :people, column: "owner_id", name: "fk"]
+        assert_equal [:add_foreign_key, [:dogs, :people, column: "owner_id", name: "fk"]], enable
+      end
+
+      def test_invert_remove_foreign_key_with_primary_key
+        enable = @recorder.inverse_of :remove_foreign_key, [:dogs, :people, primary_key: "person_id"]
+        assert_equal [:add_foreign_key, [:dogs, :people, primary_key: "person_id"]], enable
+      end
+
+      def test_invert_remove_foreign_key_with_on_delete_on_update
+        enable = @recorder.inverse_of :remove_foreign_key, [:dogs, :people, on_delete: :nullify, on_update: :cascade]
+        assert_equal [:add_foreign_key, [:dogs, :people, on_delete: :nullify, on_update: :cascade]], enable
+      end
+
+      def test_invert_remove_foreign_key_is_irreversible_without_to_table
         assert_raises ActiveRecord::IrreversibleMigration do
           @recorder.inverse_of :remove_foreign_key, [:dogs, column: "owner_id"]
         end
@@ -299,6 +324,10 @@ module ActiveRecord
         assert_raises ActiveRecord::IrreversibleMigration do
           @recorder.inverse_of :remove_foreign_key, [:dogs, name: "fk"]
         end
+
+        assert_raises ActiveRecord::IrreversibleMigration do
+          @recorder.inverse_of :remove_foreign_key, [:dogs]
+        end
       end
     end
   end