PG ::錯誤部署到heroku

Question

當我的應用程序被推送到heroku時，我得到一個奇怪的錯誤。該應用運行良好，我的本地機器。我不知道是否因爲我在本地使用Mysql？

以下是錯誤我得到：

2012-07-24T17:14:52+00:00 app[web.1]: ActionView::Template::Error (PG::Error: ERROR: argument of AND must be type boolean, not type integer 
2012-07-24T17:14:52+00:00 app[web.1]: : SELECT COUNT(*) FROM "users" INNER JOIN "articles_users" ON "users"."id" = "articles_users"."user_id" WHERE "articles_users"."article_id" = 64 AND (1)): 
2012-07-24T17:14:52+00:00 app[web.1]:  9:   <span> 
2012-07-24T17:14:52+00:00 app[web.1]:  10:   <a data-action="like" data-id="<%= a.id %>" > 
2012-07-24T17:14:52+00:00 app[web.1]:  11:   <%if user_signed_in?%> 
2012-07-24T17:14:52+00:00 app[web.1]:  12:     <%if a.likes.where(user_id = current_user.id).size == 0%> 
2012-07-24T17:14:52+00:00 app[web.1]:  13:       <%=image_tag("star.png", :width => "37", :height => "36", "data-action" => "star")%></a><span data-action="likes" style="vertical-align:10px; padding:8px;"> 
2012-07-24T17:14:52+00:00 app[web.1]:  14:     <%else%> 
2012-07-24T17:14:52+00:00 app[web.1]:  15:       <%= image_tag("star-yellow.png", :width => "37", :height => "36", "data-action" =>"star")%></a><span data-action="likes" style="vertical-align:10px; padding:8px;"> 

下面的代碼從我的觀點：

<a data-action="like" data-id="<%= a.id %>" > 
    <%if user_signed_in?%> 
     <%if a.likes.where(user_id = current_user.id).size == 0%> 
      <%= image_tag("star.png", :width => "37", :height => "36", "data-action" => "star")%></a><span data-action="likes" style="vertical-align:10px; padding:8px;"> 
     <%else%> 
      <%= image_tag("star-yellow.png", :width => "37", :height => "36", "data-action" => "star")%></a><span data-action="likes" style="vertical-align:10px; padding:8px;"> 
     <%end%> 

怎麼回事錯在這裏？ 感謝先進！

Answer 1

我改變

<%if a.likes.where(user_id = current_user.id).size == 0%> 

到

<%if !a.likes.include?(current_user)%> 

現在它工作正常。

Answer 2

你應該像這樣修改where方法。

a.likes.where(:user_id => :current_user.id) 

不

a.likes.where(user_id = current_user.id) 

我認爲這會工作。