多对关联隐藏字段编辑问题。相对回报率
我正在尝试将数组传递到隐藏字段中。
以下用户有 3 个角色 [2,4,5]
>> u = User.find_by_login("lesa")
=> #<User id: 5, login: "lesa", email: "[email protected]", crypted_password: "0f2776e68f1054a2678ad69a3b28e35ad9f42078", salt: "f02ef9e00d16f1b9f82dfcc488fdf96bf5aab4a8", created_at: "2009-12-29 15:15:51", updated_at: "2010-01-06 06:27:16", remember_token: nil, remember_token_expires_at: nil>
>> u.roles.map(&:id)
=> [2, 4, 5]
Users/edit.html.erb
<% form_for @user do |f| -%>
<%= f.hidden_field :role_ids, :value => @user.roles.map(&:id) %>
当我提交编辑表单时，我收到错误： ActiveRecord::RecordNotFound in UsersController#update “无法找到 ID=245 的角色”
接下来，我尝试将 users/edit.html.erb 编辑为：
<%= f.hidden_field :role_ids, :value => @user.roles.map(&:id).join(", ") %>
产生我认为是一个字符串：“role_ids”=>“2, 4”（所需输出：“role_ids”=>[“2”， “4”]）
当我尝试使用循环时：
<% for role in Role.find(:all) %>
<%= f.hidden_field :role_ids, :value => @user.roles.map(&:id).join(",").to_a %>
<% end %>
又产生了另一个字符串：
Parameters: {"commit"=>"Update", "action"=>"update", "_method"=>"put", "authenticity_token"=>"84Fvxxo3ao8Fl+aytOFInrLatUpslfAJggleEyy4wyI=", "id"=>"5", "controller"=>"users", "user"=>{"password_confirmation"=>"[FILTERED]", "role_ids"=>"2, 4, 5", "password"=>"[FILTERED]", "login"=>"lesa", "email"=>"[email protected]"}}
有什么建议吗？这一直是一个令人困惑的问题。
I'm trying to pass an array into a hidden_field.
The following User has 3 roles [2,4,5]
>> u = User.find_by_login("lesa")
=> #<User id: 5, login: "lesa", email: "[email protected]", crypted_password: "0f2776e68f1054a2678ad69a3b28e35ad9f42078", salt: "f02ef9e00d16f1b9f82dfcc488fdf96bf5aab4a8", created_at: "2009-12-29 15:15:51", updated_at: "2010-01-06 06:27:16", remember_token: nil, remember_token_expires_at: nil>
>> u.roles.map(&:id)
=> [2, 4, 5]
Users/edit.html.erb
<% form_for @user do |f| -%>
<%= f.hidden_field :role_ids, :value => @user.roles.map(&:id) %>
When I submit my edit form, I receive an error: ActiveRecord::RecordNotFound in UsersController#update "Couldn't find Role with ID=245"
Next I attempted to edit my users/edit.html.erb to:
<%= f.hidden_field :role_ids, :value => @user.roles.map(&:id).join(", ") %>
Yielding what I believe is a string: "role_ids"=>"2, 4" (Required Output: "role_ids"=>["2", "4"])
When I attempted using a loop:
<% for role in Role.find(:all) %>
<%= f.hidden_field :role_ids, :value => @user.roles.map(&:id).join(",").to_a %>
<% end %>
Yet another string resulted:
Parameters: {"commit"=>"Update", "action"=>"update", "_method"=>"put", "authenticity_token"=>"84Fvxxo3ao8Fl+aytOFInrLatUpslfAJggleEyy4wyI=", "id"=>"5", "controller"=>"users", "user"=>{"password_confirmation"=>"[FILTERED]", "role_ids"=>"2, 4, 5", "password"=>"[FILTERED]", "login"=>"lesa", "email"=>"[email protected]"}}
Any suggestions? This has been a perplexing problem.
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评论（4）
如果你想提交一个值数组，我相信你可以这样做：
然后Rails应该将具有相同名称
'role_ids[]'的每个隐藏字段的值合并到一个数组中，给你一些东西像这样：If you want to submit an array of values I believe you can do something like this:
Rails should then merge the value of each hidden field with the same name
'role_ids[]'into an array giving you something like this:接受的答案对我不起作用。如果您使用
hidden_field_tag但不使用f.hidden_field，则该方法有效。我需要求助于注意反括号。
The accepted answer doesn't work for me. It works if you're using
hidden_field_tagbut not withf.hidden_field. I need to resort toNote the reversed bracket.
如果你只传递 u.roles.map(&:id)[0] 会发生什么？值=2吗？也许该值不接受多值，或者您应该通过
<%= f.hidden_field :role_ids, :value=>“#{u.roles.map(&:id).join(',')}">
if you pass just the u.roles.map(&:id)[0] what happens? is the value = 2? Maybe the value don't accept multivalue or maybe you should pass
<%= f.hidden_field :role_ids, :value=>“#{u.roles.map(&:id).join(',')}">
您可以在控制器编辑操作（空中代码）中完成这项工作：
在表单中：
然后在更新操作中：
You could do the work in the controller edit action (air code):
In the form:
Then in the update action: