Ruby on rails 无法在Desive Resistation中使用carrierwave添加图像

我有一个具有图片属性的研究所模型。我正在使用carrierwave上传图像

class Institute < ActiveRecord::Base
  mount_uploader :picture, PictureUploader
end

强参数在应用程序控制器中使用

  class Institute::ParameterSanitizer < Devise::ParameterSanitizer
    def sign_up
      default_params.permit(:email,:password,:password_confirmation,:picture)
    end
  end

我花了很长时间在这方面，但不明白为什么会发生这种情况。有没有调试的方法？期待一些解决方案。谢谢

Started PUT "/institutes" for 127.0.0.1 at 2015-10-25 00:06:27 +0530
Processing by Devise::RegistrationsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"EoILK8UjrjjLfyxnFu6ozlqmfHDb/D9fp7CTmLHEjjr5i9h9ZaHGrkG4e5WUhVHMc/jirgu7+vSyH+bRrqWRAg==", "institute"=>{"email"=>"raj@gmail.com", "name"=>"RajeevIn", "phone_no"=>"555555", "address"=>"", "description"=>"", "picture"=>#<ActionDispatch::Http::UploadedFile:0x00000003e34178 @tempfile=#<Tempfile:/tmp/RackMultipart20151025-28776-o2ywzl.jpg>, @original_filename="12redroses_silk.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"institute[picture]\"; filename=\"12redroses_silk.jpg\"\r\nContent-Type: image/jpeg\r\n">, "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]", "current_password"=>"[FILTERED]"}, "commit"=>"Update"}
  Institute Load (0.6ms)  SELECT  "institutes".* FROM "institutes" WHERE "institutes"."id" = $1  ORDER BY "institutes"."id" ASC LIMIT 1  [["id", 1]]
  Institute Load (0.4ms)  SELECT  "institutes".* FROM "institutes" WHERE "institutes"."id" = $1 LIMIT 1  [["id", 1]]
Unpermitted parameters: name, phone_no, address, description, picture
   (0.2ms)  BEGIN
   (0.2ms)  COMMIT

学院，照片？carrierwave提供的方法即使存在institue.picture，也会给出false。

一些检查方法：

确保使用“保存”！以使其在未保存时引发异常。

---

看起来您正在执行更新操作，但正在将注册列入白名单。 因此，将ParameterSanitizer类更改为：

 class Institute::ParameterSanitizer < Devise::ParameterSanitizer
    def sign_up
      default_params.permit(:email,:password,:password_confirmation,:picture)
    end

   def account_update
    default_params.permit(:email,:password,:password_confirmation,:picture)
   end
  end

如果尚未完成，您可以添加此项

class ApplicationController < ActionController::Base
  before_action :configure_permitted_parameters, if: :devise_controller?

  protected

  def devise_parameter_sanitizer
    if resource_class == Institute
      Institute::ParameterSanitizer.new(Institute, :institute, params)
    else
      super # Use the default one
    end
  end
end

---

在这一行之后，未经允许的参数：姓名、电话号码、地址、描述、图片不应出现在日志中。如果仍然出现，则表示参数白名单未生效。在这种情况下，请在github上共享一个复制此问题的示例应用程序，我将帮助您修复它

请给我一些rails日志？如何确保在ORM之后加载carrierwave？文件是否保存？保存后，请尝试检查数据库以查看该文件是否存在！文件未保存在数据库中，对吗？PictureUploader.rb中显示的路径在应用程序目录中不存在。就是这个路径。谢谢。但是为什么institute.picture不是零呢？API就是这样工作的。图片是carrierwave方法，所以它的行为与其他AR属性不同。所以，它永远不会为零。你们必须使用carreriwave给出的方法来检查图片是否为零。例如picture.file.exists？如果图像不存在，则应为false。希望有帮助！谢谢。。还没到15岁。否则的话，他们会投票赞成。

institute.picture.url => nil

Started PUT "/institutes" for 127.0.0.1 at 2015-10-25 00:06:27 +0530
Processing by Devise::RegistrationsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"EoILK8UjrjjLfyxnFu6ozlqmfHDb/D9fp7CTmLHEjjr5i9h9ZaHGrkG4e5WUhVHMc/jirgu7+vSyH+bRrqWRAg==", "institute"=>{"email"=>"raj@gmail.com", "name"=>"RajeevIn", "phone_no"=>"555555", "address"=>"", "description"=>"", "picture"=>#<ActionDispatch::Http::UploadedFile:0x00000003e34178 @tempfile=#<Tempfile:/tmp/RackMultipart20151025-28776-o2ywzl.jpg>, @original_filename="12redroses_silk.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"institute[picture]\"; filename=\"12redroses_silk.jpg\"\r\nContent-Type: image/jpeg\r\n">, "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]", "current_password"=>"[FILTERED]"}, "commit"=>"Update"}
  Institute Load (0.6ms)  SELECT  "institutes".* FROM "institutes" WHERE "institutes"."id" = $1  ORDER BY "institutes"."id" ASC LIMIT 1  [["id", 1]]
  Institute Load (0.4ms)  SELECT  "institutes".* FROM "institutes" WHERE "institutes"."id" = $1 LIMIT 1  [["id", 1]]
Unpermitted parameters: name, phone_no, address, description, picture
   (0.2ms)  BEGIN
   (0.2ms)  COMMIT

 class Institute::ParameterSanitizer < Devise::ParameterSanitizer
    def sign_up
      default_params.permit(:email,:password,:password_confirmation,:picture)
    end

   def account_update
    default_params.permit(:email,:password,:password_confirmation,:picture)
   end
  end

class ApplicationController < ActionController::Base
  before_action :configure_permitted_parameters, if: :devise_controller?

  protected

  def devise_parameter_sanitizer
    if resource_class == Institute
      Institute::ParameterSanitizer.new(Institute, :institute, params)
    else
      super # Use the default one
    end
  end
end