Question

所以，事情是这样的：

关系：

类型有很多程序，程序属于类型

程序有很多组，集团属于计划

输入型号：

class Type < ActiveRecord::Base
    has_many :programs
end

程序模型：

class Program < ActiveRecord::Base
    belongs_to :type
    has_many :groups
end

小组模特：

class Group < ActiveRecord::Base
    belongs_to :program
end

在我看来：

<% @Types.each do |type|%> //this works
   //Print some info about type

  <%type.programs.each do |program|%> //this also works
     //Print some info about this program, which depends of the type above

     <%program.groups.each do |group|%> //this doesnt work at all
         //Print some info about this group, which depends of the program above
     <%end%>    

  <%end%>

<%end%>

我得到的错误如下：

uninitialized constant Program::Groups

，应用程序跟踪是：

app/views/admin/index.html.erb:33:in `block (2 levels) in _app_views_admin_index_html_erb__4501256709281346516_69833887896820'
app/views/admin/index.html.erb:18:in `block in _app_views_admin_index_html_erb__4501256709281346516_69833887896820'
app/views/admin/index.html.erb:3:in `_app_views_admin_index_html_erb__4501256709281346516_69833887896820'

Answer 1

在Program模型中

has_many :groups

在您看来应该是

program.groups.each do

你错过了这些＆＃39;分组

rails上的嵌套连接似乎不起作用

1 个答案: