make create_join_table compatible.

2 files changed, 45 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/migration/compatibility.rb b/activerecord/lib/active_record/migration/compatibility.rb
index 784292f3f9..87c1c58aff 100644
--- a/activerecord/lib/active_record/migration/compatibility.rb
+++ b/activerecord/lib/active_record/migration/compatibility.rb
@@ -71,6 +71,21 @@ module ActiveRecord
           end
         end
 
+        def create_join_table(table_1, table_2, column_options: {}, **options)
+          column_options.reverse_merge!(type: :integer)
+
+          if block_given?
+            super(table_1, table_2, column_options: column_options, **options) do |t|
+              class << t
+                prepend TableDefinition
+              end
+              yield t
+            end
+          else
+            super
+          end
+        end
+
         def add_reference(table_name, ref_name, **options)
           super(table_name, ref_name, type: :integer, **options)
         end
diff --git a/activerecord/test/cases/migration/compatibility_test.rb b/activerecord/test/cases/migration/compatibility_test.rb
index cb3b02c02a..e1311c0f21 100644
--- a/activerecord/test/cases/migration/compatibility_test.rb
+++ b/activerecord/test/cases/migration/compatibility_test.rb
@@ -199,6 +199,36 @@ class LegacyPrimaryKeyTest < ActiveRecord::TestCase
     assert_match %r{create_table "legacy_primary_keys", id: :integer, default: nil}, schema
   end
 
+  def test_legacy_join_table_foreign_keys_should_be_integer
+    @migration = Class.new(ActiveRecord::Migration[5.0]) {
+      def change
+        create_join_table :apples, :bananas do |t|
+        end
+      end
+    }.new
+
+    @migration.migrate(:up)
+
+    schema = dump_table_schema "apples_bananas"
+    assert_match %r{integer "apple_id", null: false}, schema
+    assert_match %r{integer "banana_id", null: false}, schema
+  end
+
+  def test_legacy_join_table_column_options_should_be_overwritten
+    @migration = Class.new(ActiveRecord::Migration[5.0]) {
+      def change
+        create_join_table :apples, :bananas, column_options: { type: :bigint } do |t|
+        end
+      end
+    }.new
+
+    @migration.migrate(:up)
+
+    schema = dump_table_schema "apples_bananas"
+    assert_match %r{bigint "apple_id", null: false}, schema
+    assert_match %r{bigint "banana_id", null: false}, schema
+  end
+
   if current_adapter?(:Mysql2Adapter)
     def test_legacy_bigint_primary_key_should_be_auto_incremented
       @migration = Class.new(ActiveRecord::Migration[5.0]) {