1 files changed, 13 insertions, 0 deletions
diff --git a/app/models/group.rb b/app/models/group.rb
index c459530..993d274 100644
--- a/app/models/group.rb
+++ b/app/models/group.rb
@@ -11,4 +11,17 @@ class Group < ActiveRecord::Base
   def to_s
     self.name
   end
+
+  def permission_targets(permission)
+    group_permissions.where(:permission => permission).pluck(:target_group_id)
+  end
+
+  def self.union(sets=[])
+    group_ids = []
+    sets.each do |set|
+      group_ids = group_ids + set
+    end
+
+    return group_ids.uniq
+  end
 end