使用載波在軌道上上傳圖像

Question

所以我正在開發一個簡單的分類應用程序。 我正在嘗試通過carrierwave和minimagick來實現圖像上傳，它已經被很好地證明了，並且我已經在線上關注了許多教程，它們或多或少都為使用rails和SQlite開發的應用程序提供了相同的解決方案。

實施我的代碼后，我沒有收到任何錯誤消息或警告，只是沒有上傳圖像。 當我使用DB Browser for SQlite查找數據庫時，除圖像為null之外，其他所有字段均會相應填寫。

我沒有將images屬性作為單獨的模型包括在內。 我希望它們只是我的廣告模型的一部分

PS。 這是我關於Stackoverflow的第一篇文章，請耐心等待。 除上傳圖片外，其他所有操作均有效。

new.html.erb

<div class="new_ad_form row">
<div class="col-lg-6 col-lg-offset-3">

 <%= form_for(@ad, :html => { :multipart => true }) do |f|%> 
 <%= render 'layouts/shared/error_messages', object: f.object %>
    <div class= "new_ad_field">
    <%= f.label "title:" %>  <!-- f.object here refers to @ad -->
    <%= f.text_field :title %><br>
    </div>
    <div class= "new_ad_field">
    <%= f.label :category %>
    <%= f.select :category, @categories %><br>
    </div>
    <div class= "new_ad_field">
    <%= f.label :price %>
    <%= f.number_field(:price, in: 1.0..1000000, step: 0.5) %>
    </div>
    <div class= "new_ad_field">
    <%= f.label :description %>
    <%= f.text_area :description, size: "30x5" %>
    </div>
    <div class= "new_ad_field">
    <%= f.label :address %>
    <%= f.text_field :address %><br>
    </div>
    <div class= "new_ad_field">
    <%= f.label :state %>
    <%= f.select :state, @states, {}, :onChange=>"javascript: 
    $dc.select_city();" %>
    </div>
    <div class= "new_ad_field">
    <%= f.label :city %>
    <%= f.select :city, @cities %><br>
    </div>
    <div class="field">
        <%= f.label :images %><br>
        <%= f.file_field :images, :multiple => true %>
    </div>
    <div style="text-align: center"><%= f.submit "Post ad", class: "btn btn-
       large btn-primary" %></div>
 <% end %>
</div>
</div>

ads_controller.rb

class AdsController < ApplicationController
 def new
  #@user = current_user
  @ad = Ad.new
  @categories = ['Electronic equipment', 'Cars', "Clothing", "Phones"]
  @location = {"Abia": ["Abuja","Gusau", "Kaduna", "Kano", "Yola", "Lagos", 
             "Minna", "Keffi"],
             "Zamfara": ["Abuja","Gusau", "Kaduna", "Kano", "Yola", "Lagos", 
             "Minna", "Keffi"]}

  @states = @location.keys
  @cities = @location[@location.keys[0]]

 end

def show
  @user = current_user
  @ads = @user.ads.paginate(page: params[:page])
end

def create

  @ad = current_user.ads.build(ad_params)
  if @ad.save
    flash[:success] = "ad created!"
    redirect_to current_user
  else
    render 'static_pages/home'
  end

private

  def ad_params
    params.require(:ad).permit(:user_id, :title, :category, :description, 
    :price, :address, :city, :state, {images: []})
  end

end

ad.rb

class Ad < ApplicationRecord
belongs_to :user

validates :user_id, presence: true
#validates :images, presence: true

mount_uploader :images, ImagesUploader
serialize :images, JSON
end

images_uploader.rb

class ImagesUploader < CarrierWave::Uploader::Base

 include CarrierWave::MiniMagick

 storage :file

    def store_dir
      "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
    end

   version :thumb do
     process :resize_to_fit => [50, 50]
   end

   def extension_white_list
     %w(jpg jpeg gif png)
   end

end

當然在我的gemfile中

....................
  gem 'carrierwave' 
  gem 'mini_magick'
....................

config / initializers / carrier_wave.rb

require 'carrierwave'
require 'carrierwave/orm/activerecord'

以下是命令行日志。 基本上，我試圖弄清楚為什么它回滾了交易。

Started POST "/ads" for 127.0.0.1 at 2017-06-19 14:22:00 -0400
Processing by AdsController#create as HTML
  Parameters: {"utf8"=>"✓", 
"authenticity_token"=>"7ehxs5JEkuhVasFB0m8VQkVbPLEc1+q/xPJQMD1H5Fblw==", 
"ad"=>{"title"=>"sdasdfasdfaasdf", 
"category"=>"Electronic equipment", "price"=>"500", 
"description"=>"asdfasdfasdfwetqwerfasdfasdcvzx", 
"address"=>"asdfafawefasdfadf", "state"=>"Kaduna", "city"=>"Zaria", 
"images"=>[#
<ActionDispatch::Http::UploadedFile:0x0000001041d1a0 @tempfile=#
<Tempfile:C:/Users/SAMSUNG/AppData/Local/Temp/RackMultipart20170619-8456-
1i97f2t.jpg>, 
@original_filename="394502_10152051195495464_1783658057_n.jpg", 
@content_type="image/jpeg", @headers="Content-Disposition: form-data; 
name=\"ad[images][]\"; 
filename=\"394502_10152051195495464_1783658057_n.jpg\"\r\nContent-Type: 
image/jpeg\r\n">]}, "commit"=>"Post ad"}
  User Load (1.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? 
ORDER BY "users"."id" ASC LIMIT ?  [["id", 24], ["LIMIT", 1]]
   (0.0ms)  begin transaction
   (0.0ms)  rollback transaction
No template found for AdsController#create, rendering head :no_content
Completed 204 No Content in 1706ms (ActiveRecord: 1.0ms)

Answer 1

我相信您需要在代碼中更改以下行：

mount_uploader :images, ImagesUploader

mount_uploader應該這樣復數：

mount_uploaders :images, ImagesUploader

Answer 2

您需要在config/application.rb文件中添加一些代碼

require 'carrierwave'
require 'carrierwave/orm/activerecord'

我認為它的工作嘗試了這一