轨道状态机不工作

Question

我正在创建一个博客应用程序，用户可以在其中发布并只能查看自己的帖子。只有一个管理员可以查看每个人的帖子，并具有接受或拒绝用户帖子的功能。例如，当用户分享他的帖子时，管理员将批准或拒绝该帖子。如果他批准帖子，如果管理员拒绝，帖子将被删除。我正在使用状态机，但我遇到了一些问题.我拿了两个按钮批准和拒绝，但它们不起作用。
我只希望当我单击批准按钮时，我的帖子表中有一列，默认情况下会给出一个值"待定"，因此它将更改为批准或拒绝我单击的任何按钮....如果拒绝，则应删除
该帖子单击"批准"按钮时，"state_event=批准"的未定义方法"允许"：字符串

[后.rb]

class Post < ActiveRecord::Base 
    require 'rubygems'
    require 'state_machine'
    has_many :documents
    has_many :comments, dependent: :destroy
    belongs_to :user
    validates :title, presence: true, length: {in: 5..10}
    validates :body,  presence: true,length: {in: 5..200}
        #:status is the column in posts table
    state_machine :status, :initial => :pending do
        #button name which is approve
        event :approve do
           transition :pending => :approve
        end
        event :decline do
           transition :pending => :decline
        end
    end


    def self.user_post(id)
        role = User.find_role(id)
        if role == 'admin'
            Post.all
        elsif role == 'user'
            Post.where(user_id: id)
        elsif role == 'developer'
            Post.where(user_id: id)
        end             
    end
    def self.icon(extension)
        case extension
        when 'pdf'
                EXTENSION[1]['pdf']
        when 'png' || 'jpg' || 'jpeg'
            EXTENSION[0]['png']
        when 'doc' || 'odt'
            EXTENSION[2]['doc']
        end     
    end

####limit to upload files not more than ######
    def self.upload(files,post_id)  
        files.each do |file|    
        @file_extension=file.content_type.split('/')[1]         
            doc = Document.new(document: file,post_id: post_id )
            #save is a method which will save the content in the database 
            doc.save!
        end
    end
end

[post_controller]

class PostsController < ApplicationController
    before_action :authenticate_user! 
    def index
        @posts = Post.user_post(current_user).order('created_at DESC').paginate(:page => params[:page], :per_page => 5)
    end 
    def new
        @post = Post.new
    end
    def show    
        @post=find_params
    end
    def create
        @post = Post.new(post_params)           
        @post.user = current_user
        if @post.save
            Post.upload(params[:post][:files],@post.id)         
            redirect_to @post
        else
            render 'new'
        end
    end
    def edit
        @post = find_params
    end
    def update
        @post = find_params
        if @post.update(post_params)
            redirect_to @post
        else
            render 'edit'
        end
    end
    def destroy
        @post = find_params
        @post.destroy
        redirect_to posts_path
    end
    private
        def post_params
            p = params.require(:post)
          if current_user.roles=='admin' # or however you check if the user is authorized
            p.permit(:title, :body, :state_event)
          else
            p.permit(:title, :body)
          end

        end
        def find_params
            Post.find(params[:id])
        end
end

[帖子/_form.html.erb]

<%= form_for @post,html: { multipart: true } do |f| %>
    <% if @post.errors.any? %>
        <div id="errors">
            <h2><%= pluralize(@post.errors.count, "error") %> prevented this post from saving:</h2>
            <ul>
                <% @post.errors.full_messages.each do |msg| %>
                    <li><%= msg %></li>
                <% end %>
            </ul>
        </div>
    <% end %>
    <%= f.label :title %><br>
    <%= f.text_field :title %><br>
    <br>
    <%= f.label :body %><br>
    <%= f.text_field :body %><br>
     <br>
     <!-- if you want to upload multiple files at a time -->
    <%= f.label :files %><br>
    <%= f.file_field :files,:multiple => true %><br>
    <br>

    <%= f.submit %>
    <br>
<% end %>
<br>

[帖子/编辑.html.erb]

<div id="page_wrapper">
    <h1>Edit Post</h1>
    <%= render 'form' %>
<br>
        <%= form_for @post do %>
            <%= button_to 'Approve', @post, 
      params: { post: { state_event: 'approve' } } ,
      method: :patch 
        %>
        <%= button_to 'Decline', @post, 
      params: { post: {  state_event: 'decline' } } ,
      method: :patch 
        %>
        <% end %>
</div>

Answer 1

如果要

更改模型的状态，则需要设置 state_event 属性。

<%= button_to 'Approve', @post, 
      params: { post: { state_event: 'approve' } } 
      method: :patch 
%>
<%= button_to 'Decline', @post, 
      params: { post: {  state_event: 'decline' } } 
      method: :patch 
%>

您还需要在强参数列表中添加参数：

def post_params
  p = params.require(:post)
  if current_user.is_admin? # or however you check if the user is authorized
    p.permit(:title, :body, :state_event)
  else
    p.permit(:title, :body)
  end
end

仅使用f.submit "approve"只会更改参数哈希中的submit键。

Answer 2

首先：您的按钮批准和拒绝都会触发相同的行为：它们只会发送带有form_for @posts的表单构建。我想当您按下其中之一时，您会将 POST 消息发送到您的应用程序到 post_path(@post(。我给你的建议是首先拆分这个按钮行为。尝试像这样为您的按钮添加价值：

 <%= f.button  :submit , name: "subaction",value: "approve"%>

在你的操作中，你应该看到参数[：子操作] == "批准"。