Question

我的一种表格有问题。

<%= form_for [@listing, @bike, @photo], html: { multipart: true } do |f| %>
    <div class="custom-file col-sm-10 mt-4">
      <%= f.file_field :attachment, class: "custom-file-input" %>
      <label class="custom-file-label">Ajouter une photo</label>
    </div>
    <%= f.submit "Enregistrer", class: "btn btn-primary float-sm-right mt-4" %>
<% end %>

当我浏览一个新文件并单击提交按钮时，一切正常。但是，当我单击提交按钮而不浏览任何图片时，出现此错误：

ActionController :: ParameterMissing（参数丢失或值为空：照片）：

该表格放在我的index.html.erb中。有我的控制器方法：

class PhotosController < ApplicationController
  before_action :authenticate_user!
  before_action :find_listing, :find_bike

  def index
    @photos = @bike.photos
    @photo = Photo.new
  end

  def create
    @photo = Photo.new(photo_params)
    if @photo.save
        flash[:success] = "Photo ajoutée avec succès"
        redirect_to listing_bike_photos_path(listing_id: @listing, bike_id: @listing.bike)
    else
        flash[:error] = @photo.errors.values
        redirect_to listing_bike_photos_path(listing_id: @listing, bike_id: @listing.bike)
    end
  end

  private

  def photo_params
        params.require(:photo).permit(:id, :attachment, :legend).merge(bike_id: @bike.id)
  end

  def find_listing
      @listing = Listing.find(params[:listing_id])
  end

  def find_bike
    @bike = Bike.find(params[:bike_id])
  end

end

在这里，我的路线：

resources :listings, except: [:show, :edit] do
    resources :bikes, except: [:edit] do
      resources :photos
    end
end

我想我做错了。但我看不出问题出在哪里。有人可以帮我找到问题吗？提前谢谢。

编辑

这是我的照片模特：

class Photo < ApplicationRecord
  belongs_to :bike, optional: true

  has_attached_file :attachment, styles: { medium: "300x300#", thumb: "100x100>" }, default_url: "/images/:style/missing.png"
  validates_attachment_content_type :attachment, content_type: /\Aimage\/.*\z/

  validates :attachment, presence: true
end

我的相关日志：

在2018-09-06 09:32:13 +0200开始发布127.0.0.1的POST“ / listings / 10 / bikes / 10 / photos”   由PhotosController＃create处理为HTML     参数：{“ utf8” =>“✓”，“ authenticity_token” =>“ MV4dOYOFinOZsJjr + LlFRMIsDtQyPOxmlaV6PhEUZ1I + l5QS / bvwBRWc / EXLuw59F / B1Rgt6 / 5r79 + bCiq3reg6ist =，” er“”“ >“ 10”，“ bike_id” =>“ 10”}     用户负载（0.3毫秒）选择users。*从users到users。id = 3 ORDER BY users。id ASC LIMIT 1     列表负载（0.2毫秒）SELECT listings。* FROM listings在listings。id = 10 LIMIT 1     自行车负载（0.2毫秒）选择bikes。*从bikes到bikes。id = 10极限1   在4毫秒内完成了400个错误请求（ActiveRecord：0.8毫秒）

ActionController :: ParameterMissing（参数丢失或值为空：照片）：

app / controllers / photos_controller.rb：36：in photo_params' app/controllers/photos_controller.rb:15:in create'     在营救/布局中渲染/Users/virginie/.rvm/gems/ruby-2.3.4/gems/actionpack-5.0.7/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb     呈现/Users/virginie/.rvm/gems/ruby-2.3.4/gems/actionpack-5.0.7/lib/action_dispatch/middleware/templates/rescues/_source.html.erb     呈现的/Users/virginie/.rvm/gems/ruby-2.3.4/gems/actionpack-5.0.7/lib/action_dispatch/middleware/templates/rescues/_source.html.erb（4.5ms）     呈现/Users/virginie/.rvm/gems/ruby-2.3.4/gems/actionpack-5.0.7/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb     呈现的/Users/virginie/.rvm/gems/ruby-2.3.4/gems/actionpack-5.0.7/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb（2.1ms）     呈现/Users/virginie/.rvm/gems/ruby-2.3.4/gems/actionpack-5.0.7/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb     呈现的/Users/virginie/.rvm/gems/ruby-2.3.4/gems/actionpack-5.0.7/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb（1.3ms）     在营救/布局内（108.1ms）内渲染的/Users/virginie/.rvm/gems/ruby-2.3.4/gems/actionpack-5.0.7/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb >

这是我的表的架构：

create_table "photos", force: :cascade, options: "ENGINE=InnoDB DEFAULT 
CHARSET=utf8" do |t|
    t.integer  "bike_id"
    t.datetime "created_at",              null: false
    t.datetime "updated_at",              null: false
    t.string   "attachment_file_name"
    t.string   "attachment_content_type"
    t.integer  "attachment_file_size"
    t.datetime "attachment_updated_at"
    t.string   "legend"
  end

ActionController :: ParameterMissing（参数缺失或值为空）

0 个答案: