Implemented ActiveRecord::Migrations#copy based on James Adam's idea

ActiveRecord::Migration#copy allows to copy migrations from one place
to another, changing migrations versions and adding scope to filename.

For example:
ActiveRecord::Migration.copy("db/migrate",
        :blog_engine => "vendor/gems/blog/db/migrate")

will copy all migrations from vendor/gems/blog/db/migrate to db/migrate
with such format:

Versions of copied migrations will be reversioned to be appended after
migrations that already exists in db/migrate

9 files changed, 198 insertions, 0 deletions

diff --git a/activerecord/test/cases/helper.rb b/activerecord/test/cases/helper.rb
index 1fb59d3589..4bf3c25d28 100644
--- a/activerecord/test/cases/helper.rb
+++ b/activerecord/test/cases/helper.rb
@@ -83,3 +83,21 @@ begin
 ensure
   $stdout = original_stdout
 end
+
+class << Time
+  unless method_defined? :now_before_time_travel
+    alias_method :now_before_time_travel, :now
+  end
+
+  def now
+    (@now ||= nil) || now_before_time_travel
+  end
+
+  def travel_to(time, &block)
+    @now = time
+    block.call
+  ensure
+    @now = nil
+  end
+end
+
diff --git a/activerecord/test/cases/migration_test.rb b/activerecord/test/cases/migration_test.rb
index 96b97fdd8a..85e1898b15 100644
--- a/activerecord/test/cases/migration_test.rb
+++ b/activerecord/test/cases/migration_test.rb
@@ -1875,5 +1875,116 @@ if ActiveRecord::Base.connection.supports_migrations?
       end
     end
   end
+
+  class CopyMigrationsTest < ActiveRecord::TestCase
+    def setup
+    end
+
+    def clear
+      ActiveRecord::Base.timestamped_migrations = true
+      to_delete = Dir[@migrations_path + "/*.rb"] - @existing_migrations
+      File.delete(*to_delete)
+    end
+
+    def test_copying_migrations_without_timestamps
+      ActiveRecord::Base.timestamped_migrations = false
+      @migrations_path = MIGRATIONS_ROOT + "/valid"
+      @existing_migrations = Dir[@migrations_path + "/*.rb"]
+
+      copied = ActiveRecord::Migration.copy(@migrations_path, {:bukkits => MIGRATIONS_ROOT + "/to_copy"})
+      assert File.exists?(@migrations_path + "/4_people_have_hobbies.bukkits.rb")
+      assert File.exists?(@migrations_path + "/5_people_have_descriptions.bukkits.rb")
+      assert_equal [@migrations_path + "/4_people_have_hobbies.bukkits.rb", @migrations_path + "/5_people_have_descriptions.bukkits.rb"], copied
+
+      files_count = Dir[@migrations_path + "/*.rb"].length
+      copied = ActiveRecord::Migration.copy(@migrations_path, {:bukkits => MIGRATIONS_ROOT + "/to_copy"})
+      assert_equal files_count, Dir[@migrations_path + "/*.rb"].length
+      assert copied.empty?
+    ensure
+      clear
+    end
+
+    def test_copying_migrations_without_timestamps_from_2_sources
+      ActiveRecord::Base.timestamped_migrations = false
+      @migrations_path = MIGRATIONS_ROOT + "/valid"
+      @existing_migrations = Dir[@migrations_path + "/*.rb"]
+
+      sources = ActiveSupport::OrderedHash.new
+      sources[:bukkits] = sources[:omg] = MIGRATIONS_ROOT + "/to_copy"
+      ActiveRecord::Migration.copy(@migrations_path, sources)
+      assert File.exists?(@migrations_path + "/4_people_have_hobbies.omg.rb")
+      assert File.exists?(@migrations_path + "/5_people_have_descriptions.omg.rb")
+      assert File.exists?(@migrations_path + "/6_people_have_hobbies.bukkits.rb")
+      assert File.exists?(@migrations_path + "/7_people_have_descriptions.bukkits.rb")
+
+      files_count = Dir[@migrations_path + "/*.rb"].length
+      ActiveRecord::Migration.copy(@migrations_path, sources)
+      assert_equal files_count, Dir[@migrations_path + "/*.rb"].length
+    ensure
+      clear
+    end
+
+    def test_copying_migrations_with_timestamps
+      @migrations_path = MIGRATIONS_ROOT + "/valid_with_timestamps"
+      @existing_migrations = Dir[@migrations_path + "/*.rb"]
+
+      Time.travel_to(created_at = Time.utc(2010, 7, 26, 10, 10, 10)) do
+        copied = ActiveRecord::Migration.copy(@migrations_path, {:bukkits => MIGRATIONS_ROOT + "/to_copy_with_timestamps"})
+        assert File.exists?(@migrations_path + "/20100726101010_people_have_hobbies.bukkits.rb")
+        assert File.exists?(@migrations_path + "/20100726101011_people_have_descriptions.bukkits.rb")
+        expected = [@migrations_path + "/20100726101010_people_have_hobbies.bukkits.rb",
+                    @migrations_path + "/20100726101011_people_have_descriptions.bukkits.rb"]
+        assert_equal expected, copied
+
+        files_count = Dir[@migrations_path + "/*.rb"].length
+        copied = ActiveRecord::Migration.copy(@migrations_path, {:bukkits => MIGRATIONS_ROOT + "/to_copy_with_timestamps"})
+        assert_equal files_count, Dir[@migrations_path + "/*.rb"].length
+        assert copied.empty?
+      end
+    ensure
+      clear
+    end
+
+    def test_copying_migrations_with_timestamps_from_2_sources
+      @migrations_path = MIGRATIONS_ROOT + "/valid_with_timestamps"
+      @existing_migrations = Dir[@migrations_path + "/*.rb"]
+
+      sources = ActiveSupport::OrderedHash.new
+      sources[:bukkits] = sources[:omg] = MIGRATIONS_ROOT + "/to_copy_with_timestamps"
+
+      Time.travel_to(created_at = Time.utc(2010, 7, 26, 10, 10, 10)) do
+        copied = ActiveRecord::Migration.copy(@migrations_path, sources)
+        assert File.exists?(@migrations_path + "/20100726101010_people_have_hobbies.omg.rb")
+        assert File.exists?(@migrations_path + "/20100726101011_people_have_descriptions.omg.rb")
+        assert File.exists?(@migrations_path + "/20100726101012_people_have_hobbies.bukkits.rb")
+        assert File.exists?(@migrations_path + "/20100726101013_people_have_descriptions.bukkits.rb")
+        assert_equal 4, copied.length
+
+        files_count = Dir[@migrations_path + "/*.rb"].length
+        ActiveRecord::Migration.copy(@migrations_path, sources)
+        assert_equal files_count, Dir[@migrations_path + "/*.rb"].length
+      end
+    ensure
+      clear
+    end
+
+    def test_copying_migrations_with_timestamps_to_destination_with_timestamps_in_future
+      @migrations_path = MIGRATIONS_ROOT + "/valid_with_timestamps"
+      @existing_migrations = Dir[@migrations_path + "/*.rb"]
+
+      Time.travel_to(created_at = Time.utc(2010, 2, 20, 10, 10, 10)) do
+        ActiveRecord::Migration.copy(@migrations_path, {:bukkits => MIGRATIONS_ROOT + "/to_copy_with_timestamps"})
+        assert File.exists?(@migrations_path + "/20100301010102_people_have_hobbies.bukkits.rb")
+        assert File.exists?(@migrations_path + "/20100301010103_people_have_descriptions.bukkits.rb")
+
+        files_count = Dir[@migrations_path + "/*.rb"].length
+        copied = ActiveRecord::Migration.copy(@migrations_path, {:bukkits => MIGRATIONS_ROOT + "/to_copy_with_timestamps"})
+        assert_equal files_count, Dir[@migrations_path + "/*.rb"].length
+        assert copied.empty?
+      end
+    ensure
+      clear
+    end
+  end
 end
 
diff --git a/activerecord/test/migrations/to_copy/1_people_have_hobbies.rb b/activerecord/test/migrations/to_copy/1_people_have_hobbies.rb
new file mode 100644
index 0000000000..639841f663
--- /dev/null
+++ b/activerecord/test/migrations/to_copy/1_people_have_hobbies.rb
@@ -0,0 +1,9 @@
+class PeopleHaveLastNames < ActiveRecord::Migration
+  def self.up
+    add_column "people", "hobbies", :text
+  end
+
+  def self.down
+    remove_column "people", "hobbies"
+  end
+end
diff --git a/activerecord/test/migrations/to_copy/2_people_have_descriptions.rb b/activerecord/test/migrations/to_copy/2_people_have_descriptions.rb
new file mode 100644
index 0000000000..b3d0b30640
--- /dev/null
+++ b/activerecord/test/migrations/to_copy/2_people_have_descriptions.rb
@@ -0,0 +1,9 @@
+class PeopleHaveLastNames < ActiveRecord::Migration
+  def self.up
+    add_column "people", "description", :text
+  end
+
+  def self.down
+    remove_column "people", "description"
+  end
+end
diff --git a/activerecord/test/migrations/to_copy_with_timestamps/20090101010101_people_have_hobbies.rb b/activerecord/test/migrations/to_copy_with_timestamps/20090101010101_people_have_hobbies.rb
new file mode 100644
index 0000000000..639841f663
--- /dev/null
+++ b/activerecord/test/migrations/to_copy_with_timestamps/20090101010101_people_have_hobbies.rb
@@ -0,0 +1,9 @@
+class PeopleHaveLastNames < ActiveRecord::Migration
+  def self.up
+    add_column "people", "hobbies", :text
+  end
+
+  def self.down
+    remove_column "people", "hobbies"
+  end
+end
diff --git a/activerecord/test/migrations/to_copy_with_timestamps/20090101010202_people_have_descriptions.rb b/activerecord/test/migrations/to_copy_with_timestamps/20090101010202_people_have_descriptions.rb
new file mode 100644
index 0000000000..b3d0b30640
--- /dev/null
+++ b/activerecord/test/migrations/to_copy_with_timestamps/20090101010202_people_have_descriptions.rb
@@ -0,0 +1,9 @@
+class PeopleHaveLastNames < ActiveRecord::Migration
+  def self.up
+    add_column "people", "description", :text
+  end
+
+  def self.down
+    remove_column "people", "description"
+  end
+end
diff --git a/activerecord/test/migrations/valid_with_timestamps/20100101010101_people_have_last_names.rb b/activerecord/test/migrations/valid_with_timestamps/20100101010101_people_have_last_names.rb
new file mode 100644
index 0000000000..81af5fef5e
--- /dev/null
+++ b/activerecord/test/migrations/valid_with_timestamps/20100101010101_people_have_last_names.rb
@@ -0,0 +1,9 @@
+class PeopleHaveLastNames < ActiveRecord::Migration
+  def self.up
+    add_column "people", "last_name", :string
+  end
+
+  def self.down
+    remove_column "people", "last_name"
+  end
+end
\ No newline at end of file
diff --git a/activerecord/test/migrations/valid_with_timestamps/20100201010101_we_need_reminders.rb b/activerecord/test/migrations/valid_with_timestamps/20100201010101_we_need_reminders.rb
new file mode 100644
index 0000000000..d5e71ce8ef
--- /dev/null
+++ b/activerecord/test/migrations/valid_with_timestamps/20100201010101_we_need_reminders.rb
@@ -0,0 +1,12 @@
+class WeNeedReminders < ActiveRecord::Migration
+  def self.up
+    create_table("reminders") do |t|
+      t.column :content, :text
+      t.column :remind_at, :datetime
+    end
+  end
+
+  def self.down
+    drop_table "reminders"
+  end
+end
\ No newline at end of file
diff --git a/activerecord/test/migrations/valid_with_timestamps/20100301010101_innocent_jointable.rb b/activerecord/test/migrations/valid_with_timestamps/20100301010101_innocent_jointable.rb
new file mode 100644
index 0000000000..21c9ca5328
--- /dev/null
+++ b/activerecord/test/migrations/valid_with_timestamps/20100301010101_innocent_jointable.rb
@@ -0,0 +1,12 @@
+class InnocentJointable < ActiveRecord::Migration
+  def self.up
+    create_table("people_reminders", :id => false) do |t|
+      t.column :reminder_id, :integer
+      t.column :person_id, :integer
+    end
+  end
+
+  def self.down
+    drop_table "people_reminders"
+  end
+end
\ No newline at end of file