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-rw-r--r--app/models/discussion.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/app/models/discussion.rb b/app/models/discussion.rb
index a5b12ca..675547d 100644
--- a/app/models/discussion.rb
+++ b/app/models/discussion.rb
@@ -7,6 +7,8 @@ class Discussion < ActiveRecord::Base
# creater
has_many :messages, :dependent => :destroy
+ belongs_to :discussable, :polymorphic => true
+
# participants of discussion (speakers)
has_many :speakers, :dependent => :destroy
has_many :users, :through => :speakers