From afee03cd1f4aac950fe3b243c570b93ccafc347f Mon Sep 17 00:00:00 2001
From: Rueshyna <rueshyna(XD)gmail.com>
Date: Mon, 3 Dec 2012 17:25:07 +0800
Subject: [PATCH] uniq relation

---
 app/models/user/co_author_relation.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/app/models/user/co_author_relation.rb b/app/models/user/co_author_relation.rb
index b4fb40ea..f0d5f17c 100644
--- a/app/models/user/co_author_relation.rb
+++ b/app/models/user/co_author_relation.rb
@@ -6,5 +6,6 @@ class CoAuthorRelation
 
   has_and_belongs_to_many :co_authors
 
-  validates :relation, presence: true
+  validates :relation, presence: true,
+            uniqueness: { case_sensitive: false }
 end