Question

我在通过Carrierwave上传文件时遇到问题。我的模型设置为有很多瓶子，每个瓶子可以有多个样本。每个样本都是通过Carrierwave上传的图像。但是，文件根本没有保存。我希望它保存到的目录中没有显示任何文件，并且在视图中调用if @bottle.swatches.any?并未显示任何内容。

这是我第一次使用Rails 4，所以我觉得我的错误可能是由于nooby实践（而不是实际的Carrierwave）。我已经看了很多筹码，但我没有尝试过任何工作。我究竟做错了什么？非常感谢提前！

class Swatch < ActiveRecord::Base
  belongs_to :user
  belongs_to :bottle, dependent: :destroy
  mount_uploader :swatch, SwatchUploader

  validates :user_id, presence: true
  validates :bottle_id, presence: true
end

class Bottle < ActiveRecord::Base
  belongs_to :user

  has_many :swatches
  has_many :favorite_bottles
  has_many :favorited_by, through: :favorite_bottles, source: :user

  accepts_nested_attributes_for :swatches
  validates :name, 
    presence: true,
    length:              { in: 1..100 }

end

控制器

class BottlesController < ApplicationController

  def new
    @bottle = Bottle.new
    @bottle.swatches.build
  end

  def create
    @bottle = Bottle.new(bottle_params)

    if @bottle.save
      redirect_to @bottle
    else
      render 'new'
    end

  end

  #... edit, show, index... etc


  private
    def bottle_params
      params.require(:bottle).permit(:name, :brand, :color, :finish, :swatch, :swatches)
    end

swatch_uploader.rb

class SwatchUploader < CarrierWave::Uploader::Base

  storage :file

  # Override the directory where uploaded files will be stored.
  # This is a sensible default for uploaders that are meant to be mounted:
  def store_dir
    "#{Rails.root}/uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  # Add a white list of extensions which are allowed to be uploaded.
  # For images you might use something like this:
  def extension_white_list
    %w(jpg jpeg gif png)
  end
end

HTML（HAML）

= form_for @bottle, html: { multipart: true } do |f|
  - if @bottle.errors.any?
    .alert.alert-danger
      - @bottle.errors.full_messages.each do |msg|
        = msg
  .col-md-6
    %p
      = f.fields_for :swatches do |swatch|
        = swatch.label :swatch
        = swatch.file_field :swatch
    %p
      = f.label :name
      = f.text_field :name
    %p
      = f.submit 'Submit'

在点击提交后的控制台日志中：

Started POST "/bottles" for 127.0.0.1 at 2013-11-08 10:25:54 -0500
Processing by BottlesController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"eOIHJNs6quv2OQQpp2tDn+9+d8rY8oiTjUI/gyp1bn4=", "bottle"=>{"swatches_attributes"=>{"0"=>{"swatch"=>#<ActionDispatch::Http::UploadedFile:0x007fb6aac322c0 @tempfile=#<Tempfile:/var/folders/pw/hw3vcmbs3s39dp2l89j0y23r0000gn/T/RackMultipart20131108-97524-dkcjzh>, @original_filename="Malice.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"bottle[swatches_attributes][0][swatch]\"; filename=\"Malice.jpg\"\r\nContent-Type: image/jpeg\r\n">}}, "name"=>"sdfsdf", "commit"=>"Submit"}

Answer 1

我认为问题在于你强大的障碍。试试这个：

params.require(:bottle).permit({whatever bottle inputs you have},
 swatches_attributes: [{whatever swatch inputs you have, including the picture}])

Carrierwave没有上传文件（Rails 4）

1 个答案: