Ruby-on-rails 具有has_many-belongs_to关系的ActiveAdmin表单？
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ActiveAdmin forms with has_many - belongs_to relationships?
提问by agente_secreto
I have the models Home and Photo, which have a has_many - belongs_to relationship (a polymorphic relationship, but I dont think that matters in this case). I am now setting up active admin and I would like admins to be able to add photos to homes from the homes form.
我有模型 Home 和 Photo，它们有一个 has_many -belongs_to 关系（一种多态关系，但我认为在这种情况下不重要）。我现在正在设置活动管理员，我希望管理员能够从家庭表单向家庭添加照片。
The photos are managed by the CarrierWave gem, which I dont know if will make the problem easier or harder.
照片由 CarrierWave gem 管理，我不知道这是否会使问题变得更容易或更难。
How can I include form fields for a different model in the Active Admin Home form? Any experience doing something like this?
如何在 Active Admin Home 表单中包含不同模型的表单字段？有做这样的事情的经验吗？
class Home < ActiveRecord::Base
validates :name, :presence => true,
:length => { :maximum => 100 }
validates :description, :presence => true
has_many :photos, :as => :photographable
end
class Photo < ActiveRecord::Base
belongs_to :photographable, :polymorphic => true
mount_uploader :image, ImageUploader
end
回答by jfedick
Try something like this in app/admin/home.rb:
在 app/admin/home.rb 中尝试类似的操作：
form do |f|
f.inputs "Details" do
f.name
end
f.has_many :photos do |photo|
photo.inputs "Photos" do
photo.input :field_name
#repeat as necessary for all fields
end
end
end
Make sure to have this in your home model:
确保在您的家庭模型中有这个：
accepts_nested_attributes_for :photos
I modified this from another stack overflow question: How to use ActiveAdmin on models using has_many through association?
我从另一个堆栈溢出问题修改了这个：How to use ActiveAdmin on models using has_many through association?
回答by MegaCasper
You could try this:
你可以试试这个：
form do |f|
f.semantic_errors # shows errors on :base
f.inputs # builds an input field for every attribute
f.inputs 'Photos' do
f.has_many :photos, new_record: false do |p|
p.input :field_name
# or maybe even
p.input :id, label: 'Photo Name', as: :select, collection: Photo.all
end
end
f.actions # adds the 'Submit' and 'Cancel' buttons
end
Also, you can look at https://github.com/activeadmin/activeadmin/blob/master/docs/5-forms.md(See Nested Resources)
此外，您可以查看https://github.com/activeadmin/activeadmin/blob/master/docs/5-forms.md（请参阅嵌套资源）
回答by rangalo
I guess you are looking for a form for a nested model. Take a look at following railscasts.
我猜您正在寻找嵌套模型的表单。看看下面的railscasts。
I cannot tell you much about active_admin, but I think this should not make a difference in handling the nested model.
我不能告诉你很多关于 active_admin 的信息，但我认为这对处理嵌套模型应该没有影响。
回答by John Mount
I have a has_one model, like this:
我有一个 has_one 模型，如下所示：
f.has_many :addresses do |a|
a.inputs "Address" do
a.input :street ... etc.
While this correctly reflects our associations for Address(which is a polymorphic model) using f.has_onefails. So I changed over to has_manyand all's well. Except now we have to prevent our users from creating multiple addresses for the same entity.
虽然这正确地反映了我们对Address（这是一个多态模型）使用f.has_one失败的关联。所以我换了has_many，一切都很好。除了现在我们必须阻止我们的用户为同一个实体创建多个地址。
