Question

我正在尝试在Devise用户注册表单上创建图片上传，并在我提交时不保存表单。我已将其设置如下：

user.rb

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  #has_attached_file :avatar, :styles => { :medium => "300x300>", :thumb => "100x100>" }, :default_url => "/images/:style/missing.png"

  has_attached_file :avatar, styles: {
        large: "600x450#",
        medium: "250x250#",
        small: "100x100#"
    }, :default_url => "/images/:style/filler.png"
  validates_attachment_content_type :avatar, :content_type => ["image/jpg", "image/jpeg", "image/png", "image/gif"]
  validates :avatar, presence: true
end

users_controller.rb

class UsersController < ApplicationController
    def index
        @users = User.order('created_at DESC').all
    end
    def create
      @user = User.create( user_params )
    end 
    private

    def user_params
      params.require(:user).permit(:avatar)
    end
end

/views/users/registrations/new.html.erb

<h2>Sign up yeah</h2>

<%= simple_form_for(resource, :as => resource_name, :html => { :multipart => true }, :url => registration_path(resource_name)) do |f| %>
  <%= f.error_notification %>

  <div class="form-inputs">
    <%= f.input :email, :required => true, :autofocus => true %>
    <%= f.input :password, :required => true %>
    <%= f.input :password_confirmation, :required => true %>
    <%= f.file_field :avatar %>
  </div>

  <div class="form-actions">
    <%= f.button :submit, "Sign up" %>
  </div>
<% end %>

<%= render "users/shared/links" %>

在我的开发日志中，我打印出错误：

Started POST "/users" for 127.0.0.1 at 2014-08-01 15:15:06 +0100
Processing by Devise::RegistrationsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"v/lf0StTLDOtdGtBynnecKm4fVL92+j2N9vepCvAW4U=", "user"=>{"email"=>"mdunbavan@gmail.com", "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]", "avatar"=>#<ActionDispatch::Http::UploadedFile:0x00000102c02800 @tempfile=#<File:/var/folders/mf/srx7jt8s2rdg0mn5hr98cvz80000gn/T/RackMultipart20140801-1710-n7njjc>, @original_filename="2.png", @content_type="image/png", @headers="Content-Disposition: form-data; name=\"user[avatar]\"; filename=\"2.png\"\r\nContent-Type: image/png\r\n">}, "commit"=>"Sign up"}
Command :: file -b --mime '/var/folders/mf/srx7jt8s2rdg0mn5hr98cvz80000gn/T/c81e728d9d4c2f636f067f89cc14862c20140801-1710-1mj70uf.png'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/mf/srx7jt8s2rdg0mn5hr98cvz80000gn/T/c81e728d9d4c2f636f067f89cc14862c20140801-1710-di3eje.png[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/mf/srx7jt8s2rdg0mn5hr98cvz80000gn/T/c81e728d9d4c2f636f067f89cc14862c20140801-1710-di3eje.png[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/mf/srx7jt8s2rdg0mn5hr98cvz80000gn/T/c81e728d9d4c2f636f067f89cc14862c20140801-1710-di3eje.png[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
  [1m[35m (0.3ms)[0m  begin transaction
  [1m[36mUser Exists (0.3ms)[0m  [1mSELECT 1 AS one FROM "users" WHERE "users"."email" = 'mdunbavan@gmail.com' LIMIT 1[0m
Command :: file -b --mime '/var/folders/mf/srx7jt8s2rdg0mn5hr98cvz80000gn/T/c81e728d9d4c2f636f067f89cc14862c20140801-1710-1dimcon.png'
  [1m[35m (0.3ms)[0m  rollback transaction

我在我的机器上安装了imagemagick并且工作正常，但我根本不理解这个错误。

有人可以帮忙吗？

Answer 1

当您在应用程序中使用Devise作为身份验证解决方案时，除非另有说明，否则Devise自己的控制器将用于执行所有操作。如果您注意到服务器日志

Processing by Devise::RegistrationsController#create as HTML

用户创建请求由Devise的RegistrationsController而非UsersController处理。建议您仅在需要进行极端自定义时为Devise模型创建自己的控制器。

在您的情况下，您需要做的是将avatar属性列入白名单，以便Devise知道您打算将其保存在数据库中。

执行此操作的最佳方法是通过initializer

# config/initializers/devise_permitted_parameters.rb

module DevisePermittedParameters
  extend ActiveSupport::Concern

  included do
    before_action :configure_permitted_parameters
  end

  protected

  def configure_permitted_parameters
    ## To permit attributes while registration i.e. sign up 
    devise_parameter_sanitizer.for(:sign_up) << :avatar
    ## To permit attributes while editing a registration 
    devise_parameter_sanitizer.for(:account_update) << :avatar
  end

end

DeviseController.send :include, DevisePermittedParameters

-OR -

另一种方法是更新ApplicationController，如下所示：

class ApplicationController < ActionController::Base
  #... 
  ## Add a callback
  before_action :configure_permitted_parameters, if: :devise_controller?

  protected

  def configure_permitted_parameters
    ## To permit attributes while registration 
    devise_parameter_sanitizer.for(:sign_up) << :avatar

    ## To permit attributes while editing a registration 
    devise_parameter_sanitizer.for(:account_update) << :avatar
  end
end

这种方法的缺点是它会增加额外的开销，因为会对应用程序的每个请求进行评估，以确定它是否适用于Devise控制器。

注意：为了更好地了解Devise与Rails的使用情况，我建议您通过 Daniel Kehoe 查看一个很棒的Rails and Devise示例应用程序。

<强>更新

运行which convert命令以获取安装ImageMagick的路径。

例如，如果它返回/usr/local/bin/convert，则对于开发模式，将以下行添加到config/environments/development.rb中：

Paperclip.options[:command_path] = "/usr/local/bin/"

为什么我不能使用Paperclip上传图像

1 个答案: