ruby-on-rails - 载波，保存记录？

Question

您好，我正在关注 carrierwave documentation但是我必须把这部分放在哪里？

u = User.new(params[:user])
u.save!
u.avatars[0].url # => '/url/to/file.png'
u.avatars[0].current_path # => 'path/to/file.png'
u.avatars[0].identifier # => 'file.png'

编辑 1

您好，感谢您的帮助!

在这个 Controller 中我已经有了一个创建方法 我正在使用它让管理员发布某种文章...... 我想添加多张图片

这是我的方法:

def create
respond_to do |format|
  if  @progress.save!
      format.html { redirect_to @progress, notice: 'progress was successfully created.' }
      format.json { render :show, status: :created, location: @progress }
  else
    format.html { render :new }
    format.json { render json: @progress.errors, status: :unprocessable_entity }
  end
end

结束

如何添加第一个片段？

它应该看起来更像这样:

  pr = Progress.new(params[:progress])
  pr.save!
  pr.images[0].url # => '/url/to/file.png'
  pr.images[0].current_path # => 'path/to/file.png'
  pr.images[0].identifier # => 'file.png'

再次感谢:)

编辑2

我的模式:

ActiveRecord::Schema.define(version: 20160813155729) do

  create_table "progresses", force: :cascade do |t|
   t.string   "title"
   t.text     "content"
   t.datetime "created_at", null: false
   t.datetime "updated_at", null: false
   t.string   "date"
   t.string   "images"
  end

结束

另外，因为我正在使用管理，所以我必须在 View 中创建一个特殊字段 views/fields/carrierwave_fields/_form.html.slim

= f.label :images
= f.file_field :images, multiple: true

这是我的 Controller 进度

class ProgressesController < ApplicationController

  def index
   @progresses = Progress.all
  end

 def show
  @progress = Progress.find(params[:id])
 end

 def new
  @progress = Progress.new
 end

def edit
  @progress = Progress.find(params[:id])
end

def create
  @progress = Progress.new(progress_params)
  respond_to do |format|

   if  @progress.save!
      format.html { redirect_to @progress, notice: 'progress was       successfully created.' }
      format.json { render :show, status: :created, location: @progress }
  else
    format.html { render :new }
    format.json { render json: @progress.errors, status: :unprocessable_entity }
   end
 end
end

def update
  @progress = Progress.find(params[:id])
  if @progress.update(progress_params)
    redirect_to progress_path(@progress.id)
  else
   render :progress
  end
end

private
 def progress_params
  params.require(:progress).permit(:title, :date, :content, :images})
 end
end

编辑 3

我注意到在我的服务器中有一个 Unpermitted Parameter: images 但如果您查看上面的 Controller ，图像是允许的... 我允许一组图像，它似乎不喜欢它......我该如何设置？

Started POST "/admin/progresses" for ::1 at 2016-08-14 23:11:14 +0200
Processing by Admin::ProgressesController#create as HTML
Parameters: {"utf8"=>"✓",        "authenticity_token"=>"BU7+nt4t86UyuHLI9ECY7NK8eYf2KE3hhv8M3oe23WlcS7faq70v  Xjpg4BRTzcMAyIDMD9D9idLeQ3tJbBEpRw==", "progress"=>{"title"=>"Test", "date"=>"14-08-2016", "content"=>"Donec venenatis vulputate lorem. Aenean   vulputate eleifend tellus.\r\n\r\nVestibulum volutpat pretium libero. In ac   felis quis tortor malesuada pretium.", "images"=>[#<ActionDispatch::Http::UploadedFile:0x007fd5da259060 @tempfile=#<Tempfile:/var/folders/11/mdddnw8d0zd961bsfkq1cjy00000gn/T/RackMultipart20160814-46079-1wwzmsj.jpg>, @original_filename="12189611_10153366959293347_3053265627768711994_n.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"progress[images][]\"; filename=\"12189611_10153366959293347_3053265627768711994_n.jpg\"\r\nContent-Type: image/jpeg\r\n">, #<ActionDispatch::Http::UploadedFile:0x007fd5da259038 @tempfile=#<Tempfile:/var/folders/11/mdddnw8d0zd961bsfkq1cjy00000gn/T/RackMultipart20160814-46079-t7l6bs.jpg>, @original_filename="12191872_10153366957043347_4735626737602785127_n.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"progress[images][]\"; filename=\"12191872_10153366957043347_4735626737602785127_n.jpg\"\r\nContent-Type: image/jpeg\r\n">, #<ActionDispatch::Http::UploadedFile:0x007fd5da258e30 @tempfile=#<Tempfile:/var/folders/11/mdddnw8d0zd961bsfkq1cjy00000gn/T/RackMultipart20160814-46079-1erm3j5.jpg>, @original_filename="12915103_10208497250246588_1486835977_o.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"progress[images][]\"; filename=\"12915103_10208497250246588_1486835977_o.jpg\"\r\nContent-Type: image/jpeg\r\n">, #<ActionDispatch::Http::UploadedFile:0x007fd5da258d90 @tempfile=#<Tempfile:/var/folders/11/mdddnw8d0zd961bsfkq1cjy00000gn/T/RackMultipart20160814-46079-6jbt5o.jpg>, @original_filename="13833402_10153984283243347_1465763991_o.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"progress[images][]\"; filename=\"13833402_10153984283243347_1465763991_o.jpg\"\r\nContent-Type: image/jpeg\r\n">]}, "commit"=>"Create Progress"}
Unpermitted parameter: images
(0.1ms)  begin transaction
SQL (0.4ms)  INSERT INTO "progresses" ("title", "date", "content",  "created_at", "updated_at") VALUES (?, ?, ?, ?, ?)  [["title", "Test"], ["date", "14-08-2016"], ["content", "Donec venenatis vulputate lorem.    Aenean vulputate eleifend tellus.\r\n\r\nVestibulum volutpat pretium libero. In ac felis quis tortor malesuada pretium."], ["created_at", "2016-08-14 21:11:14.199571"], ["updated_at", "2016-08-14 21:11:14.199571"]]
 (0.7ms)  commit transaction
 Redirected to http://localhost:3000/admin/progresses/1
 Completed 302 Found in 6ms (ActiveRecord: 1.1ms)

编辑 4

按照建议，我在 controller_progresses.rb 创建方法中添加了 @progress = Progress.new(progress_params)

并且还将私有(private)方法更改为:

  def progress_params
   params.require(:progress).permit(:title, :date, :content, :images)
 end

此外，我发现 sqlite3 无法支持数组，所以我将数据库更改为 PosgreSQL 现在我的架构很好.... My schema didn't display, so I asked here

ActiveRecord::Schema.define(version: 20160815134638) do

  # These are extensions that must be enabled in order to support this   database
  enable_extension "plpgsql"

 create_table "progresses", force: :cascade do |t|
    t.string   "title"
    t.string   "date"
    t.text     "content"
    t.datetime "created_at", null: false
   t.datetime "updated_at", null: false
   t.json     "images"
 end
end

编辑5

我相信我发现了错误的来源... 我正在使用 administrate gem所以我有一个包含 admin/progresses_controller.rb 的文件夹 在那里我必须覆盖 create 方法因为在 controllers/progresses_controller.rb 中 create 方法只保存一个对象...(我相信……)

所以我必须完成这个:

  module Admin
   class ProgressesController < Admin::ApplicationController

    def create
    end

   end
 end

编辑几乎完成!

所以我在Adminstrate的Module admin中添加了这个

module Admin
 class ProgressesController < Admin::ApplicationController
def create

   @progress = Progress.new(progress_params)
   @progress.save!
   @progress.images[0].url # => '/url/to/file.png'
   @progress.images[0].current_path # => 'path/to/file.png'
   @progress.images[0].identifier # => 'f

   if @progress.save!
     redirect_to admin_progresses_path, notice: "New article created!"
   end 
    # I have to imporove here ! but now images display
  end

  private
   def progress_params
    params.require(:progress).permit(:title, :date, :content, { images: [] } )
    end
   end
 end

我留下了一部分create方法 progresses_controller.rb

  def create
# @progress = Progress.new(progress_params)

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

在我看来... show.html.slim 我不知道为什么但我可以显示任何图像...

.container
 .section
  .col-xs-12
   h2 = @progress.date
   h3 = @progress.title

   p  = simple_format(@progress.content)
   br
  .col-xs-12
    .carousel-inner
      .item.active
        =image_tag @progress.images

在index.html.slim

.container
 .section
  .col-xs-12
  h1 
   |Work In Progress  [
   = @progresses.count 
   | ]
 hr

 - @progresses.each do |progress|
   h3 = progress.title
   h3 = progress.date

   =image_tag @progress.images
   br

   p = simple_format(progress.content)
   = link_to "Open", progresses_path(@progress),
    class:"btn btn-primary btn-thumb"

Answer 1

在用户模型上，你在一个字段上安装了一个载波 uploader ......假设是“头像”。因此，在每个用户实例上，您都有一个“头像”字段。

现在，当您创建一个 User 实例时 User.new(params[:user]) 如果在 params[:user] 中您有一个条目 params[:user][:avatar ] = "..."，carrierwave 将保存您的图像，将生成 url 等。[所有这些都基于您在 carrierwave uploader 中开发的内容]

附言该代码片段可以在 UsersController 的创建方法中使用:)