Rails：路由错误，注释模型到微博模型

Question

I made a commenting system and I am trying to get it to post under a micropost but I constantly get this routing error. Any suggestions? All help is much appreciated!

Routing Error

No route matches [POST] "/microposts/comments"

Form

<div class="CommentField">
<%= form_for ([@micropost, @micropost.comments.new]) do |f| %>
<%= f.text_area :content, :class => "CommentText", :placeholder => "Write a Comment..." %>
<div class="CommentButtonContainer">
<%= f.submit "Comment", :class => "CommentButton b1" %>
</div>
<% end %>
</div>

comment controller

class CommentsController < ApplicationController 
  def create
    @micropost = Micropost.find(params[:micropost_id])
    @comment = @micropost.comments.build(params[:comment])
    @comment.user_id = current_user.id
    @comment.save 
      respond_to do |format|
      format.html 
      format.js
    end
  end

end

routes

resources :microposts do
  resources :comments
end

Micropost Model

class Micropost < ActiveRecord::Base
  attr_accessible :title, :content, :view_count
  acts_as_voteable
  belongs_to :user
  has_many :comments
  has_many :views
  accepts_nested_attributes_for :comments
end

User Controller

class UsersController < ApplicationController
  def show
    @user = User.find(params[:id])
    @school = School.find(params[:id])
    @micropost = Micropost.new
    @comment = Comment.new
    @comment = @micropost.comments.build(params[:comment])
    @microposts = @user.microposts.paginate(:per_page => 10, :page => params[:page])
  end
end

Answer 1

The reason you are getting the error is that you are trying to build a form for a comments of a micropost that does not exist yet in the database.

the form, there is a -

   form_for ([@micropost, @micropost.comments.new]) do |f|

And in UsersController you have -

  @micropost = Micropost.new

comment is a sub-resource of micropost, so a url that creates a comment should look like /micropost/:id/comments where :id is the id of micropost. That is possible only after the micropost is saved.

So I believe your action should assign @micropost to an existing post, or create one right there to have the form working. Something like -

   @micropost = Micropost.last || Micropost.create

would at least get rid of the error.

Answer 2

I'll try this again (deleted my other answer since, as Marc Talbot pointed out, was not the correct response to your issue) .

Perhaps the issue is as simple as making :microposts be :micropost instead (to reflect your model's name) .

resources :micropost do
  resources :comments
end