Merge pull request #4726 from rafaelfranca/create_join_table

Add create_join_table migration helper to create HABTM join tables

1 files changed, 17 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/migration/join_table.rb b/activerecord/lib/active_record/migration/join_table.rb
new file mode 100644
index 0000000000..01a580781b
--- /dev/null
+++ b/activerecord/lib/active_record/migration/join_table.rb
@@ -0,0 +1,17 @@
+module ActiveRecord
+  class Migration
+    module JoinTable #:nodoc:
+      private
+
+      def find_join_table_name(table_1, table_2, options = {})
+        options.delete(:table_name) { join_table_name(table_1, table_2) }
+      end
+
+      def join_table_name(table_1, table_2)
+        tables_names = [table_1, table_2].map(&:to_s).sort
+
+        tables_names.join("_").to_sym
+      end
+    end
+  end
+end