具有多态性的belongs_to的accepts_nested_attributes_for

问题描述

我想与accepts_nested_attributes_for建立多态关系.这是代码:

I would like set up a polymorphic relation with accepts_nested_attributes_for. Here is the code:

class Contact <ActiveRecord::Base
  has_many :jobs, :as=>:client
end

class Job <ActiveRecord::Base
  belongs_to :client, :polymorphic=>:true
  accepts_nested_attributes_for :client
end

当我尝试访问时Job.create(..., :client_attributes=>{...}给我NameError: uninitialized constant Job::Client

推荐答案

刚刚发现Rails不支持这种行为，所以我想出了以下解决方法:

Just figured out that rails does not supports this kind of behavior so I came up with the following workaround:

class Job <ActiveRecord::Base
  belongs_to :client, :polymorphic=>:true, :autosave=>true
  accepts_nested_attributes_for :client

  def attributes=(attributes = {})
    self.client_type = attributes[:client_type]
    super
  end

  def client_attributes=(attributes)
    self.client = type.constantize.find_or_initialize_by_id(attributes.delete(:client_id)) if client_type.valid?
  end
end

这使我可以像这样设置表单:

This gives me to set up my form like this:

<%= f.select :client_type %>
<%= f.fields_for :client do |client|%>
  <%= client.text_field :name %>
<% end %>

不是确切的解决方案，但是这个想法很重要.

Not the exact solution but the idea is important.

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