Made migrations rollbackeable

db/migrate/20150909131133_set_username_limit.rb

@@ -1,6 +1,10 @@
 class SetUsernameLimit < ActiveRecord::Migration
-  def change
+  def up
     execute "ALTER TABLE users ALTER COLUMN username TYPE VARCHAR(60) USING SUBSTR(username, 1, 60)"
     change_column :users, :username, :string, limit: 60
   end
+
+  def down
+    change_column :users, :username, :string, limit: nil
+  end
 end

db/migrate/20150909135032_remove_comment_title.rb

@@ -1,5 +1,5 @@
 class RemoveCommentTitle < ActiveRecord::Migration
   def change
-    remove_column :comments, :title
+    remove_column :comments, :title, :string
   end
 end

db/migrate/20150909142534_set_organization_name_limit.rb

@@ -1,6 +1,10 @@
 class SetOrganizationNameLimit < ActiveRecord::Migration
-  def change
+  def up
     execute "ALTER TABLE organizations ALTER COLUMN name TYPE VARCHAR(60) USING SUBSTR(name, 1, 60)"
     change_column :organizations, :name, :string, limit: 60
   end
+
+  def down
+    change_column :organizations, :name, :string, limit: nil
+  end
 end

db/migrate/20150909153455_set_tag_name_limit.rb

@@ -1,6 +1,10 @@
 class SetTagNameLimit < ActiveRecord::Migration
-  def change
+  def up
     execute "ALTER TABLE tags ALTER COLUMN name TYPE VARCHAR(40) USING SUBSTR(name, 1, 40)"
     change_column :tags, :name, :string, limit: 40
   end
+
+  def down
+    change_column :tags, :name, :string, limit: nil
+  end
 end