add convenience methods for checking migrations

if a rails project needs to be migrated ActiveRecord::Migrator.needs_migration? will be true or false if the current version matches the last version. 

1 files changed, 8 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index ac4f53c774..2975b045e7 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -605,6 +605,14 @@ module ActiveRecord
         end
       end
 
+      def needs_migration?
+        current_version != last_version
+      end
+
+      def last_version
+        migrations(migrations_paths).last.try(:version)||0
+      end
+
       def proper_table_name(name)
         # Use the Active Record objects own table_name, or pre/suffix from ActiveRecord::Base if name is a symbol/string
         name.table_name rescue "#{ActiveRecord::Base.table_name_prefix}#{name}#{ActiveRecord::Base.table_name_suffix}"