Ruby on rails Rails 4强参数和嵌套形式
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一个项目,并为每个项目创建多个屏幕。当创建一个屏幕时,用户可以上传一个屏幕截图,该截图引用了它自己的模型(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,屏幕截图似乎无法创建。以下是服务器日志:Ruby on rails Rails 4强参数和嵌套形式,ruby-on-rails,ruby,ruby-on-rails-4,Ruby On Rails,Ruby,Ruby On Rails 4,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一个项目,并为每个项目创建多个屏幕。当创建一个屏幕时,用户可以上传一个屏幕截图,该截图引用了它自己的模型(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,屏幕截图似乎无法创建。以下是服务器日志: Processing by ScreensController#create as HTML Parameters: {"utf8"=>"✓", "authenticity_token"=&g
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
由ScreensController处理#创建为HTML
参数:{“utf8”=>“✓", "真实性令牌“=>”kezaGADsaLmY/+zozgbjEe5UfdeqRPg58FCf1qzfHxY=“,”屏幕“=>{”项目id“=>”24”,“名称“=>”账单“,”说明“=>”这是用户输入信用卡信息的页面,“屏幕截图”=>{“图像”=>,“提交”=>“创建屏幕”}
不允许的参数:屏幕截图
这些是我的模型:
屏风
class Screen < ActiveRecord::Base
belongs_to :project
has_many :screenshots
validates :name, presence: true
accepts_nested_attributes_for :screenshots
end
类屏幕
截图
class Screenshot < ActiveRecord::Base
belongs_to :screen
end
class屏幕截图
这是我的电脑控制器:
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
class ScreensControllerparams[:project\u id])
@screen.screenshot.build
结束
定义编辑
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def创建
@屏幕=屏幕。创建(屏幕参数)
如果@screen.save
flash[:notice]=“此项目已添加新屏幕”
将_重定向到[@screen.project]
其他的
呈现:操作=>“新建”
结束
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def更新
@screen=screen.find(参数[:id])
如果@screen.update_属性(screen_参数)
flash[:notice]=“屏幕已成功更新”
将_重定向到[@screen.project]
其他的
呈现:操作=>“编辑”
结束
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def销毁
@screen=screen.find(参数[:id])
@破坏
flash[:注意]=“已成功销毁屏幕”
将_重定向到[@screen.project]
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私有的
def设置屏幕
@screen=screen.find(参数[:id])
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def屏幕参数
参数require(:screen).permit(:project\u id,:name,:description,screenshot\u attributes:[:id,:screen\u id,:image,:version])
结束
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最后是形式:
<%= 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 %>
{:multipart=>true}do | f |%>
禁止保存此屏幕:
@screen.id%>
"1" %>
我希望这足以帮助我发现问题。说到编程,我是个新手,所以任何帮助都是非常受欢迎的。我最近也做过类似的工作,这似乎很管用 将您的字段\u更改为复数:
<%= f.fields_for :screenshots do |s| %>
此外,您还需要更新新的操作,使屏幕截图成为复数形式,如下所示:
def new
@screen = Screen.new(:project_id => params[:project_id])
@screen.screenshots.build
end
你试过
,因为它的复数形式有很多吗?请看谢谢,但现在我的文件字段消失了。我也将方法new更新为defnew@screen=screen.new(:project\u id=>params[:project\u id])@screen.screenshot.build end
对不起,我之前的评论拼错了。即使使用@screen.screenshots.build
,该字段也不会显示。
def new
@screen = Screen.new(:project_id => params[:project_id])
@screen.screenshots.build
end