Ruby on rails 表单_，用于rails中未更新的嵌套属性

我有一个表单，它应该更新一个嵌套属性，即tenantuser托管模型。我在获取正确语法时遇到了问题

_托管更新表单.html.erb

routes.rb

namespace :tenants do
  resources :escrow

托管模式

class Escrow
  include Mongoid::Document

  #associations
  belongs_to :tenant

租户模型

class Tenant
  include Mongoid::Document

  has_one :escrow, autosave: true, dependent: :destroy

  accepts_nested_attributes_for :escrow

模型将不会更新。它给出了nil:NilClass的错误未定义方法“update”

nil:NilClass的未定义方法“update”

这意味着@tenant没有任何托管

如果@tenant.escrow为零，则在@escrow\u update\u form.html.erb中构建一个托管

---

问题：是否在视图中构建模型？SupremeA您也可以在控制器端构建它。有条件地。

class Escrow
  include Mongoid::Document

  #associations
  belongs_to :tenant

class Tenant
  include Mongoid::Document

  has_one :escrow, autosave: true, dependent: :destroy

  accepts_nested_attributes_for :escrow

<% escrow = @tenant.escrow ?  @tenant.escrow : @tenant.build_escrow %>
<%= form_for @tenant, url: tenants_escrow_path, method: :patch, validate: true do |a| %>   
 <%= a.fields_for :escrow, escrow do |f| %>   
  <%= f.label :new_amount_to_escrow %>
  <%= f.number_field(:escrow_payment) %>
 <% end %>
  <%= a.submit("Done! Go back to the Dashboard", {class: "btn btn-success btn-lg", :id=> 'goalButton'}) %>

<% end %>

def update
 @tenant = current_tenant
 if @tenant.update(escrow_params) #updating @tenant will automatically update the corresponding escrow
    redirect_to tenants_dashboard_path, notice: "Your escrow payment informaton has been updated"
 else
    redirect_to tenants_escrow_path, notice: "Your escrow payment was not updated, try again"
 end
end
private
  def escrow_params
    params.require(:tenant).permit(:escrow_payment, :home_value, :total_saved, escrow_attributes: [])
  end 
end