when delete co-author relation, the co-author will be reset nil

app/controllers/desktop/co_author_relations_controller.rb

@@ -27,6 +27,7 @@ class Desktop::CoAuthorRelationsController < ApplicationController
   def destroy
     @co_author_relation = CoAuthorRelation.find(params[:id])
     @co_author_relation.destroy
+    #reset_co_author_relation @co_author_relation
 
     render :json => {success: true, msg: "deleted successfully!"}
   end

app/helpers/desktop/co_author_relations_helper.rb

@@ -1,2 +1,8 @@
 module Desktop::CoAuthorRelationsHelper
+  def reset_co_author_relation relation
+    co_author = CoAuthor.where(co_author_relations_id: relation)
+    co_author.map do |c|
+      co_author.update_attributes(co_author_relations_id: nil)
+    end
+  end
 end