ActiveAdmin自定义属地表单 [英] ActiveAdmin customizing the form for belongs_to

问题描述

我有以下关联：

class Course < ActiveRecord::Base
  has_many :signup
  has_many :user, :through => :signup

  accepts_nested_attributes_for :signup
end

class User < ActiveRecord::Base
  has_many :signup
  has_many :course, :through => :signup

  accepts_nested_attributes_for :signup
end

class Signup < ActiveRecord::Base
  belongs_to :course
  belongs_to :user
end

现在，我想为注册自定义ActiveAdmin表单，以便将课程标题和用户名显示为选择内容而不是文本字段。

Now, I would like to customize the ActiveAdmin form for "Signup", so it shows the title of the courses and the name of the users as a select and not as a textfield.

默认表单已经做到了，但是我需要进一步自定义表单，因此无法重现默认表单。

The default form already does that, however I need to customize the form further and I can't reproduce the default form.

推荐答案

您的表单块将在您的 admin / signups.rb 中看起来像这样：

Your form block will look something like this in your admin/signups.rb:

form do |f|
    f.input :course
    t.input :user
end

默认情况下，由于课程和 user 是关联，因此应该为您提供 collection_select -即，将模型的 name 属性作为标签， id s作为价值。如果您已通过输入 sa输入类型，这将迫使它们显示为该类型。

By default, since course and user are associations, this should give you a collection_select - that is, a with the name attribute of your models as labels, ids as values. If you had passed your inputs a input type, this will force them to display as that type.

form do |f|
    f.input :course, :as => :string
end

这只会为您提供 course_id 文本输入字段，您可能仅在其中输入关联对象的ID。要重现默认格式，只需继续为相关属性添加 input s。您甚至可以将它们包装在 f.inputs 中进行分组，使它们看起来很漂亮。

This'll just give you a course_id text input field, where you'll probably just enter the ID for the associated object. To "reproduce the default form", just continue adding inputs for the relevant attributes. You can even wrap them in f.inputs to group them and make things look pretty.

form do |f|
    f.inputs "Basic Details" do
        f.input :course
        f.input :user
    end
end

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