活动管理员编辑表单不预先填充belongs_to关系

Question

Im using Rails 4 and I have a form within active admin that does not pre-populate or load relationship data into the edit form. If I dont define a form then the default that is loaded by active admin does, but it is shows the object and not the object.name for example so I have set out to edit it.

Here is what I have

form do |c|
  c.semantic_errors *c.object.errors.keys
  c.inputs "Event" do
    c.input :title
    c.input :date, :as => :datetime_picker, :local => true 
    c.input :description
  end
  c.inputs "Training Request" do
    c.inputs :for => [:training_request, c.object.training_request || c.object.build_training_request] do |w|
      list_of_training_requests = TrainingRequest.fulfilled.collect {|t| t.host.name }
      w.input :id, as: :select, :collection => list_of_training_requests
    end
  end
  c.inputs "Trainer" do
    c.inputs :for => [:trainer, c.object.trainer || c.object.build_trainer] do |x|
      list_of_trainers = Trainer.qualified.collect {|t| t.name }
      x.input :id, as: :select, :collection => list_of_trainers
    end
  end
  c.actions
end

The form loads without any errors and does list data just not what is set the in the database eg

If anyone can point me in the right direction it would be very much appreciated.

Answer 1

If the only problem with the original forms is that it just displays the object instead of name you could overwrite to_s in your models. For example:

class Trainer < ActiveRecord::Base
  def to_s
    name
  end
end

Then when you call an instance of Trainer it should display the name property.