From 9d19bae233d7a2ce9adac39b6b6e91de85729def Mon Sep 17 00:00:00 2001
From: Christopher Meiklejohn <christopher.meiklejohn@gmail.com>
Date: Fri, 29 Jul 2011 21:26:21 -0400
Subject: [PATCH] Support backwards compatible interface for migration down/up
 with rails 3.0.x.

---
 activerecord/lib/active_record/migration.rb   |  1 +
 .../test/cases/invertible_migration_test.rb   | 24 +++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index 507f345ef5..9307d7ef24 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -329,6 +329,7 @@ class << self
     end
 
     def self.method_missing(name, *args, &block) # :nodoc:
+      self.delegate = self.new
       (delegate || superclass.delegate).send(name, *args, &block)
     end
 
diff --git a/activerecord/test/cases/invertible_migration_test.rb b/activerecord/test/cases/invertible_migration_test.rb
index afec64750e..acba4a134e 100644
--- a/activerecord/test/cases/invertible_migration_test.rb
+++ b/activerecord/test/cases/invertible_migration_test.rb
@@ -27,6 +27,19 @@ def change
       end
     end
 
+    class LegacyMigration < ActiveRecord::Migration
+      def self.up
+        create_table("horses") do |t|
+          t.column :content, :text
+          t.column :remind_at, :datetime
+        end
+      end
+
+      def self.down
+        drop_table("horses")
+      end
+    end
+
     def teardown
       if ActiveRecord::Base.connection.table_exists?("horses")
         ActiveRecord::Base.connection.drop_table("horses")
@@ -53,5 +66,16 @@ def test_down
       migration.migrate :down
       assert !migration.connection.table_exists?("horses")
     end
+
+    def test_legacy_up
+      LegacyMigration.migrate :up
+      assert ActiveRecord::Base.connection.table_exists?("horses"), "horses should exist"
+    end
+
+    def test_legacy_down
+      LegacyMigration.migrate :up
+      LegacyMigration.migrate :down
+      assert !ActiveRecord::Base.connection.table_exists?("horses"), "horses should not exist"
+    end
   end
 end
-- 
GitLab