rails中不更新的form_for嵌套属性

Question

我有一个表单，它应该更新一个嵌套属性(租户(用户)托管模型)，我在获得正确的语法时遇到了问题。

_escrow_update_form.html.erb

<%= form_for @tenant，url: tenants_escrow_path，方法：：修补程序，验证: true do \a颇具%> <%= a.fields_for :escrow do \f\x %> <%= f.label :new_amount_to_escrow %> <%= f.number_field(:escrow_payment) %> <% end %> <%= a.submit(“完成！返回到仪表板“，{class："btn btn-成功btn-lg"，:id=> 'goalButton'}) %> <% end %>

escrow_controller

def update @tenant = current_tenant if @tenant.escrows.update( escrow_params ) redirect_to tenants_dashboard_path，注意：“您的代管付款信息已更新”否则redirect_to tenants_escrow_path，通知：“您的托管付款未更新，请重试”结束私有def escrow_params params.permit(:escrow_payment，:home_value，:total_saved) end end

routes.rb

namespace :tenants do
  resources :escrow

代管模型

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

模型不会更新。它给出了错误“NilClass的未定义方法‘`update’”

Answer 1

“0:NilClass的未定义方法‘`update’”

这意味着@tenant没有任何escrow

在_escrow_update_form.html.erb中，如果escrow为0，则构建@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 %>

在强参数白名单嵌套参数中

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