已完成422无法处理的实体RESTful API Rails上传图片时

我有一个Android应用程序，它可以拍照并发送到基于Ruby on Rails的RESTful API。虽然我从应用程序进行身份验证后上传图像，但发生了422个无法处理的实体错误。我用载波宝石处理图像。这里是我的User_controller.rb文件已完成422无法处理的实体RESTful API Rails上传图片时

class UsersController < ApplicationController 
    skip_before_action :authorize_request, only: :create 
    #skip_before_action :verify_auth_token 
    # POST /signup 
    # return authenticated token upon signup 
    def create 
    user = User.create!(user_params) 
    auth_token = AuthenticateUser.new(user.email, user.password).call 
    response = { message: Message.account_created, auth_token: auth_token } 
    json_response(response, :created) 
    end 

    def index 
    json_response(@current_user) 
    end 

    private 

    def user_params 
    params.permit(
     :name, 
     :email, 
     :password, 
     :password_confirmation, 
    ) 
    end 
end

images_controller.rb文件

class ImagesController < ApplicationController 
    before_action :set_user 
    before_action :set_user_image, only: [:show, :update, :destroy, :create] 

    def index 
    json_response(@current_user.images) 
    end 

    def show 
    json_response(@image) 
    end 

    def create 
    @current_user.images.create(image_params) 
    json_response(@current_user, :user_id) 
    end 

    private 
    def image_params 
    params.permit(:photo) 
    end 

    def set_user 
    @current_user = User.find(params[:user_id]) 
    end 

    def set_user_image 
    @image = @current_user.images.find_by!(id: params[:id]) if @current_user 
    end 


end

这里是我的模型文件。 user.rb

# app/models/user.rb 
class User < ApplicationRecord 
    mount_uploader :photo, PhotoUploader 


    # encrypt password 
    has_secure_password 
    has_many :images, foreign_key: :user_id 

    # Validations 
    validates_presence_of :name, :email, :password_digest 

end

image.rb

class Image < ApplicationRecord 
    mount_uploader :photo, PhotoUploader 
    belongs_to :user 
end

的routes.rb

Rails.application.routes.draw do 
    resources :users do 
    resources :images 
    end 
    post 'auth/login', to: 'authentication#authenticate' 
    post 'signup', to: 'users#create' 
    post 'images', to: 'images#create' 
end

错误日志：

Started POST "/images" for 203.159.41.110 at 2017-07-03 21:44:56 +0700 
Processing by ImagesController#create as HTML 
    Parameters: {"photo"=>#<ActionDispatch::Http::UploadedFile:0x005615c5a900e8 @tempfile=#<Tempfile:/tmp/RackMultipart20170703-29818-3gozwl.jpg>, @original_filename="IMG_20170703_202628.jpg", @content_type="application/octet-stream", @headers="Content-Disposition: form-data; name=\"photo\"; filename=\"IMG_20170703_202628.jpg\"\r\nContent-Type: application/octet-stream\r\nContent-Transfer-Encoding: binary\r\n">, "auth_token"=>"token"} 
Completed 422 Unprocessable Entity in 2ms (Views: 1.2ms | ActiveRecord: 0.0ms)

来源

2017-07-03 Sathwik Gangisetty