add co-author db and curd page, but it can't destory it...

app/controllers/desktop/co_authors_controller.rb

@@ -0,0 +1,71 @@
+class Desktop::CoAuthorsController < ApplicationController
+  def index
+    @co_authors = CoAuthor.where(name_id: current_user.id)
+
+    respond_to do |format|
+      format.html { render :layout => false}
+      format.json { render json: @co_authors }
+    end
+  end
+
+  def show
+    @co_author = CoAuthor.find(params[:id])
+
+    respond_to do |format|
+      format.html { redirect_to desktop_co_authors_url, :layout => false }
+      format.json { render json: @co_author }
+    end
+  end
+
+  def new
+    @co_author = CoAuthor.new
+
+    respond_to do |format|
+      format.html { render :layout => false}
+    end
+  end
+
+  def edit
+    @co_author = CoAuthor.find(params[:id])
+    respond_to do |format|
+      format.html { render :layout => false}
+    end
+  end
+
+  def create
+    @co_author = CoAuthor.new(params[:co_author])
+    @co_author.name_id= current_user.id
+
+    respond_to do |format|
+      if @co_author.save
+        format.html { redirect_to desktop_co_authors_path, :layout => false, notice: 'CoAuthor was successfully created.' }
+      else
+        format.html { render action: "new", :layout => false}
+      end
+    end
+  end
+
+  def update
+    @co_author = CoAuthor.find(params[:id])
+
+      respond_to do |format|
+        if @co_author.update_attributes(params[:co_author])
+          format.html { redirect_to desktop_co_authors_url, notice: 'CoAuthor was successfully updated.' }
+          format.json { head :no_content }
+        else
+          format.html { render action: "edit" }
+          format.json { render json: @co_author.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  def delete
+    @co_author = CoAuthor.find(params[:id])
+    @co_author.destroy
+
+    respond_to do |format|
+      format.html { redirect_to desktop_co_authors_url, :layout => false }
+      format.json { head :no_content }
+    end
+  end
+end