沒有路線匹配{：action =>「index」，：controller =>「comments」，：post_id => nil}缺少必需的鍵：[：post_id]

Question

這是我遇到的問題，解決它。現在登錄賬戶時發生這種情況。直到昨晚，我還沒有遇到這個問題。

這裏是我的users_controller.rb，

class UsersController < ApplicationController 
    before_action :set_user, only: [:edit, :update, :destroy] 
    before_action :correct_user, only: [:edit ] 

    after_action :signed_in_after_register, only: :create 

    def index 
    @users = User.all 
    @user = User.find(session[:user_id]) 
    if params[:search] 
     @users = User.search(params[:search]).order("created_at DESC") 
     else 
     @users = User.all.order('created_at DESC') 
     end 
    end 

    def dashboard 
    @user = User.find(session[:user_id]) unless session[:user_id] == "" 
    redirect_to login_path, notice: "You're not logged in" unless @user 
    @posts = @user.posts.order("created_at DESC").limit(3) 
    @comment = Comment.new 
    @post = Post.new 
    end 

    def newsfeed 
    @user = User.find(session[:user_id]) unless session[:user_id] == nil 
    redirect_to login_path, notice: "You're not logged in" unless @user 
    @posts = @user.posts.order("created_at DESC").limit(3) 
    end 

    def nav 
    @user = User.find(session[:user_id]) 
    end 
    def posts 
    @user = User.find(session[:user_id]) 
    @posts = @user.posts 
    end 

    def destroy 
    @user = User.find(session[:user_id]) unless session[:user_id] == "" 
    redirect_to login_path, notice: "You're not logged in" unless @user 
    end 

    def welcome 
    @user = User.find(params[:user_id]) unless session[:user_id] == "" 
    redirect_to login_path, notice: "You're not logged in" unless @user 
    @user = User.find(session[:user_id]) 
    end 
    def show 
    @user = User.find(params[:user_id]) unless session[:user_id] == "" 
    redirect_to login_path, notice: "You're not logged in" unless @user 
    @posts = @user.posts.order("created_at DESC").limit(3) 
    @comment = Comment.new 
    @post = Post.new 
    end 

    def new 
    @user = User.new 
    @post = Post.new(params[:post_id]) 
    end 

    def edit 
    @user = User.find(params[:user_id]) if params[:user_id] 
    redirect_to @dashboard_path unless @user 
    end 

    def create 
    @user = User.new(user_params) 

    respond_to do |format| 
     if @user.save 
     format.html { redirect_to dashboard_path, notice: 'User was successfully created!' } 
     format.json { render :profile, status: :created, location: @user } 
     else 
     format.html { render :new } 
     format.json { render json: @user.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

    def update 
    if @user == current_user 
     respond_to do |format| 
     if @user.update(user_params) 
      format.html { redirect_to dashboard_path, notice: 'User was successfully updated.' } 
      format.json { render :profile, status: :ok, location: @user } 
     else 
      format.html { render :edit } 
      format.json { render json: @user.errors, status: :unprocessable_entity } 
     end 
     end 
    else 
     redirect_to dashboard_path, notice: 'You do not have permission to edit the profile of another user.' 
    end 
    end 

    def destroy 
    @user.destroy 
    respond_to do |format| 
     format.html { redirect_to users_url, notice: 'User was successfully destroyed.' } 
     format.json { head :no_content } 
    end 
    end 

    private 
    def set_user 
     @user = User.find(params[:id]) 
    end 
    def correct_user 
     @user = User.find(params[:id]) unless session[:user_id] == "" 

    end 
    def signed_in_after_register 
     session[:user_id] = @user.id 
    end 

    def user_params 
     params.require(:user).permit(:first_name, :last_name, :bio, :comments, :password, :password_confirmation, :email, :age, :profile_picture, :post, :body) 
    end 
end 

繼承人我的意見_form.html.erb，

<%= form_for([@post, @comment]) do |f| %> 
    <p> 
     <%= f.text_area :body, placeholder: "Write a comment!" %> 
    </p> 
    <br> 
    <p> <%= f.submit %> </p> 

<% end %> 

這裏是我的routes.rb，

Rails.application.routes.draw do 

    root 'welcome#welcome' 

    get 'login' => 'sessions#login', :as => :login 

    get 'dashboard' => 'users#dashboard', :as => :dashboard 

    post 'logging/user' => 'sessions#create' 

    get 'logout' => 'sessions#destroy', :as => :logout 

    get 'about' => 'about' 

    get 'newsfeed' => 'users#newsfeed' 

    resources :users, except: :show 
    get 'profile/:user_id' => 'users#show', as: :profile 

    get 'location' => 'location#location' 

    resources :posts do 
    resources :comments 
    end 

    get 'index' => 'posts#index' 

    get 'register' => 'users#new', :as => :register 

end 

如果你們需要再看一段代碼，那就讓我知道，我會發布它！提前感謝你！

Answer 1

問題是你正在嘗試創建一個如下所示的URL：/posts/:post_id/comments通過傳遞form_for([@post, @comment])。沒有將@comment保存到數據庫是可以的，但是您使用的@post必須已保存到數據庫，因爲如果沒有@post有ID，則無法創建該URL。

一旦保存了@post，它將有一個ID，因此您可以生成路由：例如，/posts/32/comments。

檢查您的dashboard.html.erb文件，查看您使用的位置@posts和渲染comments/_form.html.erb。您可能有一個post對象可用，您應該在您的表單中使用它：form_for([post, @comment])。

您可能還想從您的#dashboard控制器操作中刪除@post = Post.new行。