1 files changed, 9 insertions, 0 deletions
diff --git a/activerecord/lib/rails/generators/active_record/migration/migration_generator.rb b/activerecord/lib/rails/generators/active_record/migration/migration_generator.rb
index f6a432c6e5..a3c274d9b9 100644
--- a/activerecord/lib/rails/generators/active_record/migration/migration_generator.rb
+++ b/activerecord/lib/rails/generators/active_record/migration/migration_generator.rb
@@ -7,6 +7,7 @@ module ActiveRecord
 
       def create_migration_file
         set_local_assigns!
+        validate_file_name!
         migration_template "migration.rb", "db/migrate/#{file_name}.rb"
       end
 
@@ -41,6 +42,14 @@ module ActiveRecord
           attribute.name.singularize.foreign_key
         end.to_sym
       end
+      
+      private
+
+        def validate_file_name!
+          unless file_name =~ /^[_a-z0-9]+$/
+            raise IllegalMigrationNameError.new(file_name)
+          end
+        end
     end
   end
 end