我正在构建一个简单的应用程序(
Ruby 2.0.0和Rails 4),用户可以在其中创建项目,并为每个项目创建多个屏幕.在创建屏幕时,用户可以上传屏幕截图,引用自己的模型(我这样做是为了处理同一屏幕的多个版本).
创建屏幕时,由于权限问题,似乎无法创建屏幕截图.这是服务器日志:
Processing by ScreensController#create as HTML Parameters: {"utf8"=>"✓","authenticity_token"=>"kezaGADsaLmY/+zozgbjEe5UfdeqRPg58FCf1qzfHxY=","screen"=>{"project_id"=>"24","name"=>"Billing","description"=>"This is the page where a user will enter their credit card information","screenshot"=>{"image"=># <Actiondispatch::Http::UploadedFile:0x007fcdce25b2c0 @tempfile=#<Tempfile:/var/folders/pv/srwrv0qj35b0hsxkt42l_z500000gn/T/RackMultipart20131007-91790-tewse9>,@original_filename="fb-banner.png",@content_type="image/png",@headers="Content-disposition: form-data; name=\"screen[screenshot][image]\"; filename=\"fb-banner.png\"\r\nContent-Type: image/png\r\n">}},"commit"=>"Create Screen"} Unpermitted parameters: screenshot
这些是我的模特:
屏幕
class Screen < ActiveRecord::Base belongs_to :project has_many :screenshots validates :name,presence: true accepts_nested_attributes_for :screenshots end
截图
class Screenshot < ActiveRecord::Base belongs_to :screen end
这是我的screens_controller:
class ScreensController < ApplicationController before_action :set_screen,only: [:show,:edit,:update,:destroy] def index @screens = Screen.all end def show end def new @screen = Screen.new(:project_id => params[:project_id]) @screen.screenshot.build end def edit end def create @screen = Screen.create(screen_params) if @screen.save flash[:notice] = "A new screen has been added to this project" redirect_to [@screen.project] else render :action => 'new' end end def update @screen = Screen.find(params[:id]) if @screen.update_attributes(screen_params) flash[:notice] = "The screen has been successfully updated" redirect_to [@screen.project] else render :action => 'edit' end end def destroy @screen = Screen.find(params[:id]) @screen.destroy flash[:notice] = "Successfully destroyed screen" redirect_to [@screen.project] end private def set_screen @screen = Screen.find(params[:id]) end def screen_params params.require(:screen).permit(:project_id,:name,:description,screenshot_attributes: [ :id,:screen_id,:image,:version ]) end end
最后这是形式:
<%= form_for @screen,:html => { :multipart => true } do |f| %> <% if @screen.errors.any? %> <div id="error_explanation"> <h2><%= pluralize(@screen.errors.count,"error") %> prohibited this screen from being saved:</h2> <ul> <% @screen.errors.full_messages.each do |msg| %> <li><%= msg %></li> <% end %> </ul> </div> <% end %> <div class="field"> <%= f.hidden_field :project_id %> </div> <div class="field"> <%= f.label :name %><br> <%= f.text_field :name %> </div> <div class="field"> <%= f.label :description %><br> <%= f.text_field :description %> </div> <%= f.fields_for :screenshot do |s| %> <%= s.hidden_field :screen_id,:value => @screen.id %> <%= s.hidden_field :version,:value => "1" %> <%= s.label :image %><br> <%= s.file_field :image %> <% end %> <div class="actions"> <%= f.submit %> </div> <% end %>
我希望这足以帮助我发现问题.在编程时我是新手,所以任何帮助都非常受欢迎.
解决方法
我最近经历过类似的事情,这似乎有用……
将您的fields_for更改为复数:
<%= f.fields_for :screenshots do |s| %>
而且,让你的参数
def screen_params params.require(:screen).permit(:project_id,screenshots_attributes: [ :id,:version ]) end
此外,您需要更新新操作以使屏幕截图复数,如下所示:
def new @screen = Screen.new(:project_id => params[:project_id]) @screen.screenshots.build end
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