Json Загрузка изображения на RoR-Server: NoMethodError undefined method `allow '

Question

Я хочу загрузить изображение из приложения android на сервер Ruby on Rails, но у меня есть ошибка, которая говорит NoMethodError undefined метод` allow'. Я думаю, что что-то не так с моими параметрами. RoR получить эти параметры:

Parameters: {"document"=>#<ActionDispatch::Http::UploadedFile:0x53c1b10 @tempfile=#<Tempfile:C:/Users/Clemens/AppData/Local/Temp/RackMultipart20160911-9268-qqwltt.jpg>, @original_ 
filename="IMG_20160911_122254.jpg", @content_type="application/octet-stream", @headers="Content-Disposition: form-data; name=\"document\"; filename=\"IMG_20160911_122254.jpg\"\r\nCo 
ntent-Type: application/octet-stream\r\nContent-Transfer-Encoding: binary\r\n">} 

Это мой documents_controller.rb

class DocumentsController < ApplicationController 
    before_action :set_document, only: [:show, :edit, :update, :destroy] 
skip_before_filter :verify_authenticity_token 

    # GET /documents 
    # GET /documents.json 
    def index 
    @documents = Document.all 
    end 

    # GET /documents/1 
    # GET /documents/1.json 
    def show 
    send_data(@document.file_contents, 
       type: @document.content_type, 
       filename: @document.filename) 
    end 

    # GET /documents/new 
    def new 
    @document = Document.new 
    end 

    #POST /documents 
    #POST /documents.json 
    def create 
    @document = Document.new(document_params) 

    respond_to do |format| 
     if @document.save 
     format.html { redirect_to documents_path, notice: 'Document was successfully created.' } 
     format.json { render action: 'show', status: :created, location: @document } 
     else 
     format.html { render action: 'new' } 
     format.json { render json: @document.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

    # PATCH/PUT /documents/1 
    # PATCH/PUT /documents/1.json 
    def update 
    respond_to do |format| 
     if @document.update(document_params) 
     format.html { redirect_to @document, notice: 'Document was successfully updated.' } 
     format.json { head :no_content } 
     else 
     format.html { render action: 'edit' } 
     format.json { render json: @document.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

    # DELETE /documents/1 
    # DELETE /documents/1.json 
    def destroy 
    @document.destroy 
    respond_to do |format| 
     format.html { redirect_to documents_url } 
     format.json { head :no_content } 
    end 
    end 

    private 
    # Use callbacks to share common setup or constraints between actions. 
    def set_document 
     @document = Document.find(params[:id]) 
    end 

    # Never trust parameters from the scary internet, only allow the white list through. 
    def document_params 
     params.require(:document).permit(:file) 
    end 

end 

application_controller.rb

class ApplicationController < ActionController::Base 
    # Prevent CSRF attacks by raising an exception. 
    # For APIs, you may want to use :null_session instead. 
############ protect_from_forgery with: :exception 
    protect_from_forgery with: :null_session 



end 

модели/document.rb

class Document < ActiveRecord::Base 

    validate :file_size_under_one_mb 

    def initialize(params = {}) 
    @file = params.delete(:file) 
    super 
    if @file 
     self.filename = sanitize_filename(@file.original_filename) 
     self.content_type = @file.content_type 
     self.file_contents = @file.read 
    end 
    end 

    private 

    def sanitize_filename(filename) 
     # Get only the filename, not the whole path (for IE) 
     # Thanks to this article I just found for the tip: http://mattberther.com/2007/10/19/uploading-files-to-a-database-using-rails 
     return File.basename(filename) 
    end 

    NUM_BYTES_IN_MEGABYTE = 1048576 
    def file_size_under_one_mb 
    if (@file.size.to_f/NUM_BYTES_IN_MEGABYTE) > 1 
     errors.add(:file, 'File size cannot be over one megabyte.') 
     end 
    end 

end 

При попытке загрузить изображение, я получаю сообщение об ошибке:

NoMethodError (undefined method `permit' for #<ActionDispatch::Http::UploadedFile:0x59553c0>): 

app/controllers/documents_controller.rb:72:in `document_params' 
app/controllers/documents_controller.rb:27:in `create' 
    Rendering C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout 
    Rendering C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_source.html.erb 
    Rendered C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_source.html.erb (5.0ms) 
    Rendering C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb 
    Rendered C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (3.0ms) 
    Rendering C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb 
    Rendered C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.0ms) 
    Rendered C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-5.0.0.1/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (840.0 
ms) 

Я долго думал об этой проблеме. Как я могу решить эту проблему? Мое предложение состоит в том, что Json предоставляет String, но моя программа ruby ​​on rails требует хеша. Что я могу сделать?

Answer 1

Проблема заключается в том, что значение "document" не является хешем, а экземпляром ActionDispatch. Вот почему вы получаете сообщение об ошибке.

permit может быть применен не к хешу. Измените метод document_params на

def document_params 
    params.permit(:document) 
end