由于评论是在多个位置发布的：习惯，目标等。我在评论/评论中使用哪条路径来编辑评论？
我试过了：
<%= link_to edit_comment_path(comment) do %> #Or should we use conditionals to target: edit_habit_comment_path, edit_goal_comment_path, etc?
<%= comment.content %>
<% end %>
但点击它后我们会收到此错误：
ActiveRecord :: RecordNotFound（无法找到评论＆＃39; id＆＃39; = 2 [WHERE＆＃34;评论＆＃34;。＆＃34; commentable_id＆＃34; =？AND＆## 34;评论＆＃34;。＆＃34; commentable_type＆＃34; =？]）
我在这里玩了def edit的内容：
comments_controller
class CommentsController < ApplicationController
before_action :load_commentable
before_action :set_comment, only: [:show, :edit, :update, :destroy, :like]
before_action :logged_in_user, only: [:create, :destroy]
def index
@comments = @commentable.comments
end
def new
@comment = @commentable.comments.new
end
def create
@comment = @commentable.comments.new(comment_params)
if @comment.save
redirect_to @commentable, notice: "comment created."
else
render :new
end
end
def edit
@habit = Habit.find(params[:id])
@goal = Goal.find(params[:id])
@commentable = @habit
@comments = @commentable.comments
@comment = current_user.comments.find(params[:id])
end
def update
@comment = current_user.comments.find(params[:id])
if @comment.update_attributes(comment_params)
redirect_to @commentable, notice: "Comment was updated."
else
render :edit
end
end
def destroy
@comment = current_user.comments.find(params[:id])
@comment.destroy
redirect_to @commentable, notice: "comment destroyed."
end
def like
@comment = Comment.find(params[:id])
@comment_like = current_user.comment_likes.build(comment: @comment)
if @comment_like.save
@comment.increment!(:likes)
flash[:success] = 'Thanks for liking!'
else
flash[:error] = 'Two many likes'
end
redirect_to(:back)
end
private
def set_comment
@comment = Comment.find(params[:id])
end
def load_commentable
resource, id = request.path.split('/')[1, 2]
@commentable = resource.singularize.classify.constantize.find(id)
end
def comment_params
params[:comment][:user_id] = current_user.id
params.require(:comment).permit(:content, :commentable, :user_id, :like)
end
end
我密切关注本教程：http://railscasts.com/episodes/154-polymorphic-association-revised
如果您需要进一步的说明或代码来帮助我，请告诉我们：）
我尝试了很多替代路线：
Rails.application.routes.draw do
get 'notes/index'
get 'notes/new'
get 'notifications/index'
get 'auth/:provider/callback', to: 'sessions#facebook'
get 'auth/failure', to: redirect('/')
get 'signout', to: 'sessions#destroy', as: 'signout'
get 'password_resets/new'
get 'password_resets/edit'
resources :users do
resources :comments
end
shallow do
resources :habits do
resources :comments
end
resources :goals do
resources :comments
end
end
resources :notes
resources :habits do
resources :notes
resources :notifications
resources :comments do
resources :likes
end
resources :likes
member do
post :like
post :notifications
end
resources :levels do
# we'll use this route to increment and decrement the missed days
resources :days_missed, only: [:create, :destroy]
end
end
resources :goals do
resources :notes
resources :comments
member do
post :like
end
end
resources :valuations do
resources :notes
resources :comments
resources :notifications
member do
post :like
post :notifications
end
end
resources :quantifieds do
resources :notes
resources :comments
member do
post :like
end
end
resources :results
resources :users
resources :account_activations, only: [:edit]
resources :activities do
resources :valuations
resources :comments
resources :notifications
member do
post :like
post :notifications
end
end
resources :comments do
resources :comments
member do
post :like
end
end
resources :password_resets, only: [:new, :create, :edit, :update]
resources :relationships, only: [:create, :destroy]
get 'tags/:tag', to: 'pages#home', as: :tag
resources :users do
member do
get :following, :followers
end
end
get 'about' => 'pages#about'
get 'signup' => 'users#new'
get 'login' => 'sessions#new'
post 'login' => 'sessions#create'
delete 'logout' => 'sessions#destroy'
root 'pages#home'
end
答案 0 :(得分：1)
您可能会发现shallow nested routes有用。基本上，你写
shallow do
resources :goals do
resources :comments
end
# ...
end
相当于
resources :goals do
resources :comments, only: [:index, :new, :create]
end
resources :comments, only: [:show, :edit, :update, :destroy]
# ...
这意味着，只有那些绝对需要嵌套的动作才会实际嵌套。如果您只想显示，编辑，更新或销毁评论，它将像任何其他非嵌套资源一样工作，您只需使用edit_comment_path。
您需要相应地更改控制器，因为commentable_id（即goal_id）不再是网址的一部分。您仍然可以通过@comment.commentable（用于重定向）访问可评论的内容。我在注释控制器中设置注释的最干净的解决方案是在:commentable_id中查找params的名称，而不是摆弄请求路径。这将导致像这样的控制器：
class CommentsController < ApplicationController
before_action :set_commentable, only: [:index, :new, :create]
before_action :set_comment, only: [:edit, :update, :destroy, :like]
def index
@comments = @commentable.comments
end
def new
@comment = @commentable.comments.new
end
def create
@comment = @commentable.comments.new(comment_params)
if @comment.save
redirect_to @commentable, notice: "Comment created."
else
render :new
end
end
def edit
end
def update
if @comment.update_attributes(comment_params)
redirect_to @comment.commentable, notice: "Comment was updated."
else
render :edit
end
end
def destroy
@comment.destroy
redirect_to @comment.commentable, notice: "Comment destroyed."
end
def like
@comment_like = current_user.comment_likes.build(comment: @comment)
if @comment_like.save
@comment.increment!(:likes)
flash[:success] = 'Thanks for liking!'
else
flash[:error] = 'Too many likes'
end
redirect_to(:back)
end
private
def set_commentable
@commentable = find_commentable
end
# add more commentable models here
def find_commentable
if params[:goal_id]
Goal.find(params[:goal_id])
elsif params[:habit_id]
Habit.find(params[:habit_id])
else
fail 'Unsupported commentable'
end
end
def set_comment
@comment = current_user.comments.find(params[:id])
end
def comment_params
params[:comment][:user_id] = current_user.id
params.require(:comment).permit(:content, :commentable, :user_id, :like)
end
end