没有路由匹配“缺少必需的密钥：”

如何解决没有路由匹配错误消息 – >没有路由匹配{：action =>“show”，：controller =>“cost”，：format => nil，：id => nil，：travel_id => nil}缺失必填项：[：id，：travel_id]

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routes.rb中：

resources :travels do resources :costs end resources :profiles resources :homes devise_for :users 

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Costs_controller：

  before_action :set_travel before_action :set_cost, only: [:show, :edit, :update, :destroy] def index @travel = Travel.find(params[:travel_id]) if current_user.present? @costs = @travel.costs.all else redirect_to '/users/sign_in' end end def new @travel = Travel.find(params[:travel_id]) if current_user.present? @cost = @travel.costs.new else redirect_to '/users/sign_in' end end def create @travel = Travel.find(params[:travel_id]) @cost = @travel.costs.new(costs_params) respond_to do |format| if @cost.save format.html { redirect_to travel_cost_path(@costs), notice: 'Cost was successfully created.' } format.json { render :show, status: :created, location: @cost } else format.html { render :new } format.json { render json: @cost.errors, status: :unprocessable_entity } end end end 

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我的模特：

 class Travel < ActiveRecord::Base belongs_to :user has_many :costs end class Cost < ActiveRecord::Base belongs_to :travel end 

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我的费用_form：

   
 
 prohibited this cost from being saved:
 
  
  
 
  
 
  
 
 
  
 
 
  
 
 
  
 
  
  

如果可能请帮助我，我正处于这个问题的时候。 谢谢。

Answer 1

更改

 format.html { redirect_to travel_cost_path(@costs), notice: 'Cost was successfully created.' } 

至

 format.html { redirect_to travel_cost_path(@travel, @cost), notice: 'Cost was successfully created.' }