如果当前用户已经提交过作业就不显示新增作业按钮

app/helpers/courses_helper.rb

@@ -157,4 +157,9 @@ module CoursesHelper
     end
     people.include?(User.current)
   end
+  #获取当前用户在指定作业下提交的作业的集合
+  def cur_user_homework_for_bid bid
+    cur_user_homework = HomeworkAttach.where("user_id = ? and bid_id = ?",User.current,params[:id])
+    cur_user_homework
+  end
 end

app/views/bids/_homework.html.erb

@@ -13,17 +13,19 @@
 	<% end %>
 	<script type="text/javascript">
 		function j_submit () {
-			alert('start')
+			alert('start');
 			var  submit_homework = function(){
 				$('#add_homework_form').clone().attr('action', '<%= url_for({:controller => "bids", :action => "add_homework"})+".js" %>').ajaxSubmit()
 			};
-			alert('stop')
+			alert('stop');
 			$.globalEval(submit_homework());
 			return false;
 		}
 	</script>
 </div>
-<% if User.current.logged? && (!Member.where('user_id = ? and project_id = ?', User.current.id, @bid.courses.first.id).first.nil? && (Member.where('user_id = ? and project_id = ?', User.current.id, @bid.courses.first.id).first.roles&Role.where('id = ? or id = ? or id =?',5, 10, 7)).size >0) %>
+<% if User.current.logged? && (!Member.where('user_id = ? and project_id = ?', User.current.id, @bid.courses.first.id).first.nil? &&
+          (Member.where('user_id = ? and project_id = ?', User.current.id,
+          @bid.courses.first.id).first.roles&Role.where('id = ? or id = ? or id =?',5, 10, 7)).size >0) && cur_user_homework_for_bid(@bid).count == 0  %>
 <div class='icon icon-add'>
 	<!-- <%= link_to l(:label_commit_homework), new_submit_homework_path, :onclick => "$('#put-bid-form').slideToggle(); this.blur(); return false;" %> -->
     <%= link_to l(:label_course_new_homework),new_homework_attach_path  %>