Question

我有一个房东类，它有N个地址。房东接受地址的嵌套属性我有一个用于创建房东的表单，该表单是创建地址的子表单。

地址要求landlord_id有效，因此保存。

当我创建房东时如何创建地址而不必在房东控制器的create方法调用中保存房东两次？

landlord_controller.rb＃创建

def create      
     #check if a landlord of the same name already exists and load that instead
     @landlord = Landlord.where(:name => params[:landlord][:name], \
       :city_id => params[:landlord][:city_id], \
       :province_id => params[:landlord][:province_id]). 
     first_or_create

 if @landlord.save 

   flash[:success] =  #"Thank you for submitting a Landlord " 
   #@landlord.addresses.build ....
   #@landlord.save
   redirect_to @landlord
 else
    render :new     
 end
end

landlord / new.html.erb＃form

<%= form_for @landlord do |f| %>
    <%= f.fields_for :address do  |address_form| %>

     <%= address_form.label :number %>
     <%= address_form.text_field :number %>

     <%= address_form.label :street %>
     <%= address_form.text_field :street %>

     <%= address_form.label "#{:unit}# / Apt #" %>
     <%= address_form.text_field :unit %>

     <%= address_form.label :postal %>
     <%= address_form.text_field :postal %>

 <% end %>
<% end %>

Answer 1

当然，请使用find_or_initialize_by(...)代替where(...).first_or_create（或者，您可以保持相同的where模式并使用first_or_initialize）。然后使用assign_attributes添加地址，最后尝试save。正如@CodeGroover建议的那样，你可以稍微重构一下：

other_params = params[:landlord].slice!(:name, :city_id, :province_id)
@landlord = Landlord.find_or_initialize_by(params[:landlord])

@landlord.assign_attributes(other_params)

if @landlord.save
  ...

从父create方法中创建嵌套模型

1 个答案: