Question

我有以下设置：

class User < ActiveRecord::Base

  has_many :device_ownerships, :dependent => :destroy
  has_many :devices, :through => :device_ownerships

end

class device < ActiveRecord::Base
  has_one :device_ownership, :dependent => :destroy
  has_one :user, :through => :device_ownership

end


class deviceOwnership < ActiveRecord::Base
  belongs_to :user  
  belongs_to :device
  validates_uniqueness_of :device_id, :scope => :user_id
  validates_uniqueness_of :user_id, :scope => :device_id
end

我正在尝试在Active Admin中实现以下功能：

在编辑屏幕

1）列出属于用户的所有设备，并选择删除设备或销毁将设备连接到用户的deviceOwnership

2）可以选择从现有设备创建新的配对用户设备（通过创建新的DeviceOwnership）。

3）可以选择创建新设备并通过新的DeviceOwnership将其添加到用户。

我在下面的评论中列出了我现在所遇到的问题：

ActiveAdmin.register User do

  permit_params :email, :password, :password_confirmation, :role,
    device_ownerships_attributes: [:device_id, :user_id],
    devices_attributes: [:device_identifier]

  index do |user|
    user.column :email
    user.column :current_sign_in_at
    user.column :last_sign_in_at
    user.column :sign_in_count
    user.column :role
    actions
  end

  filter :email

  form do |f|
    f.inputs "User Details" do
      f.input :email
      f.input :password
      f.input :password_confirmation
      f.input :role, as: :radio, collection: {Editor: "editor", Moderator: "moderator", Administrator: "administrator"}

  #This one  allows to create new devices but also lists all existing devices with option to modify their device_identifier column which I don't want
      f.has_many :devices, :allow_destroy => true, :heading => 'Themes', :new_record => true do |cf|
        cf.input :device_identifier
      end

  #This one  lists all the devices but no option to remove any of them.
      f.input :devices

  #This one shows dropdownw with existing devices but allows to swap them

      f.has_many :devices, :allow_destroy => true do |device_f|
        device_f.input :device_identifier, :as => :select, :collection => device.all.map{ |device| [device.device_identifier] }, include_blank: false,
      end


      f.actions
    end

  end
end

Answer 1

该行

my_enum != ALL(enum_range(null::MyEnum))

看起来它可以完成这项工作。您可以检查cf.object是否是新记录，并且只允许用户在这种情况下更改f.has_many :devices, :allow_destroy => true, :heading => 'Themes', :new_record => true do |cf| cf.input :device_identifier end。

device_identifier

或类似cf.input :device_identifier if cf.object.new_record?

的内容

您怎么看？

通过Active Admin中的关联添加和列出has_many

1 个答案: