can add relation between co-author

app/controllers/desktop/co_author_relations_controller.rb

@@ -0,0 +1,32 @@
+class Desktop::CoAuthorRelationsController < ApplicationController
+  def index
+    @co_author_relations = CoAuthorRelation.all
+    new
+
+    respond_to do |format|
+      format.html {render layout: false }
+    end
+  end
+
+  def new
+    @new_relation = CoAuthorRelation.new
+  end
+
+  def create
+    @new_relation = CoAuthorRelation.new(params[:co_author_relation])
+
+    if @new_relation.save
+      render json: {success:true, msg: "New Relation successfully saved!"}.to_json
+    else
+      error_msg = @new_relation.errors.full_messages.join("<br />")
+      render json: {success: false, msg: error_msg}.to_json
+    end
+  end
+
+  def destroy
+    @co_author_relation = CoAuthorRelation.find(params[:id])
+    @co_author_relation.destroy
+
+    render :json => {success: true, msg: "deleted successfully!"}
+  end
+end