Question

我收到了这个heroku错误，

这些是我的Heroku日志。

2013-10-15T19:51:45.703129+00:00 app[web.1]:  19: <% cities = SubjectGradeCity.includes(:city).collect(&:city).uniq %>
2013-10-15T19:51:45.703129+00:00 app[web.1]:  20: <% grades = SubjectGradeCity.includes(:grade).where(:city_id).collect {|s| {:name => s.grade.name, :id => s.grade.id}}.uniq %>
2013-10-15T19:51:45.703129+00:00 app[web.1]: ActionView::Template::Error (PG::Error: ERROR:  argument of WHERE must be type boolean, not type integer
2013-10-15T19:51:45.703129+00:00 app[web.1]: LINE 1: ...ade_cities".* FROM "subject_grade_cities"  WHERE ("subject_g...
2013-10-15T19:51:45.703129+00:00 app[web.1]:                                                              ^
2013-10-15T19:51:45.703129+00:00 app[web.1]: 17: <%= simple_form_for :assignments_filter , :html => {:id => "assignments_filter_form"}, :url => {:controller => "requests", :action => "assignments2"  } do |f| %>

这是我在视图中的代码

<% cities = SubjectGradeCity.includes(:city).collect(&:city).uniq %>
<% grades = SubjectGradeCity.includes(:grade).where(:city_id).collect {|s| {:name => s.grade.name, :id => s.grade.id}}.uniq %>
<% subjects = SubjectGradeCity.includes(:subject).where(:city_id).collect {|s| {:name => s.subject.name, :id => s.subject.id}}.uniq %>
<% grades.unshift({:name => "You have to select your city first", :id => ""}) if grades.empty? %>
<% subjects.unshift({:name => "You have to select your city first", :id => ""}) if subjects.empty? %>

请帮助..

Answer 1

您的where子句不会调用任何可比较的内容，因此PG不知道要在结果中包含什么。 where子句必须求值为true / false。

你可能正在寻找类似的东西：

<% cities = SubjectGradeCity.includes(:city).collect(&:city).uniq %>
<% grades = SubjectGradeCity.includes(:grade).where(:city_id => cities).collect {|s| {:name => s.grade.name, :id => s.grade.id}}.uniq %>
<% subjects = SubjectGradeCity.includes(:subject).where(:city_id => cities).collect {|s| {:name => s.subject.name, :id => s.subject.id}}.uniq %>

这样你就比较了你的where子句，看它是否包含在城市中的第一行...虽然我不确定它是否会起作用，因为你的第一行是返回一组SubjectGradeCity对象而不是城市对象。但你可以从那里弄明白吗？

编辑：您还应该采纳NickM的建议，将这些方法移出视图。他们肯定应该在模型层。

Answer 2

你永远不应该在你的视图中放置数据库查询。我至少会将它们移到帮助器上，但理想情况下应该在模型中定义它们。也就是说，只要你把它放在你的模型中，Helios的答案就是好的。

PG ::错误：错误：WHERE的参数必须是boolean类型，而不是类型integer

2 个答案: