Question

我有一个表单，应该更新一个嵌套属性（承租人（用户）托管模型），但我无法获取正确的语法。

_escrow_update_form.html.erb

<%= form_for @tenant, url: tenants_escrow_path, method: :patch, validate: true do |a| %>   
 <%= a.fields_for :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 %>

escrow_controller

def update
 @tenant = current_tenant
 if @tenant.escrows.update(escrow_params)
    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  
private
  def escrow_params
    params.permit(:escrow_payment, :home_value, :total_saved)
  end 
end

routes.rb

namespace :tenants do
  resources :escrow

托管模型

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

该模型不会更新。它给出错误“ nil：NilClass的未定义方法'update'”

Answer 1

“ nil：NilClass的未定义方法'update'”

这意味着@tenant没有任何escrow

如果_escrow_update_form.html.erb为零，则在escrow中构建一个@tenant.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 %>

在强参数白名单中嵌套参数

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

form_for嵌套属性未在rails中更新

1 个答案: