【发布时间】：2015-10-30 13:46:51
【问题描述】：
我的主要问题是，通过carrierwave 上传文件时并没有真正上传。
我的控制台输出：
#<OptionPic id: 4, image_url: "game_of_thrones___tyrion_lannister_by_stanbos-d79k...", created_at: "2015-08-07 06:08:01", updated_at: "2015-08-07 06:08:01", option_id: 12>]>
对图像的调用如下
-@product.options.each do |option|
-option.option_pics.each do |op|
=image_tag op.image_url.to_s
如果我检查网页上的元素，这就是我得到的：
<img src="/images/game_of_thrones___tyrion_lannister_by_stanbos-d79k0u9_modified.jpg" alt="Game of thrones tyrion lannister by stanbos d79k0u9 modified">
但是上传器上的设置如下：
class ProductImageUploader < CarrierWave::Uploader::Base
# Include RMagick or MiniMagick support:
include CarrierWave::RMagick
# include CarrierWave::MiniMagick
# Choose what kind of storage to use for this uploader:
storage :file
# storage :fog
# 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
"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end
不用说，我既没有在 assets/images 文件夹中创建图像，也没有创建 public/uploads 文件夹。
这在我的其他项目中完美运行（public/uploads 文件夹使用与上述相同的语法创建），其中图像存储为单独的模型。在我当前的项目中，我希望它们作为产品类的子选项。
结构如下：
模型 - 产品、选项、选项图片（ture）
一个产品可以有很多选项，而一个选项又可以有很多图片。例如 - 产品是一件 T 恤。选项有：材质和颜色。对于每种颜色，我想要一张不同的衬衫图片。
这就是我的 ProductsController 中包含所有内容的原因：
Class ProductsController < ApplicationController
before_action :find_product, only: [:show]
def show
end
def index
@products = Product.all
end
def new
@product = Product.new
@option = @product.options.new
@option_pic = OptionPic.new
end
def edit
end
def create
@product = Product.create(product_params)
@option = @product.options.create(option_params)
@option.product_id = @product.id
@option.save
@option_pic = @option.option_pics.create(pic_params)
@option_pic.option_id = @option.id
flash[:success] = "Product successfully created!"
redirect_to products_path
end
private
def product_params
params.require(:product).permit(:title, :description, :advertising_text, :fancy_quote)
end
def option_params
params.require(:option).permit(:size, :weight, :price, :material, :product_id)
end
def pic_params
params.require(:option_pic).permit(:image_url, :option_id)
end
def find_product
@product = Product.find(params[:id])
end
end
我的 optionpic(ture) 模型：
class OptionPic < ActiveRecord::Base
mount_uploader :product_image, ProductImageUploader
belongs_to :option
end
我认为我只是犯了一些愚蠢的新手错误，但经过数小时的搜索后，我就是无法弄清楚出了什么问题。
编辑
我想出了两件事 - 我使用 image_url 而不是 picture_image 并忘记将 option_picture 值实际保存在控制器中，即@option_pic.save
现在上传时怎么没有数据传输：
SQL (0.3ms) INSERT INTO "option_pics" ("product_image", "option_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4) RETURNING "id" [["product_image", nil], ["option_id", 18], ["created_at", "2015-08-07 08:03:28.559319"], ["updated_at", "2015-08-07 08:03:28.559319"]]
我将每个值从 :image_url 更新为 :product_image（在视图中，在 pic_params 等中）
编辑 2
根据要求，我的上传表单：
%h1 Create new product
=form_for @product, url: products_path do |f|
%p
=f.label :title
=f.text_field :title
%br
=f.label :description
=f.text_area :description
%br
=f.label :advertising_text
=f.text_area :advertising_text
%br
=f.label :fancy_quote
=f.text_area :fancy_quote
%p
= fields_for @option do |o|
=o.label :price
=o.text_field :price
%br
=o.label :size
=o.text_field :size
%br
=o.label :weight
=o.text_field :weight
%br
=o.label :material
=o.text_field :material
%p
= fields_for @option_pic, html: { multipart: true } do |op|
= op.label 'Upload image'
= op.file_field :product_image
=f.submit
编辑 3
根据要求，我的日志参数
Started POST "/products" for ::1 at 2015-08-07 12:25:31 +0300
Processing by ProductsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"DOeZMvYpdoVmZRpsGmg2Gr9LIc9RYaS1KT1vdfhXI2BJaV3pPZZbZN8PJnvwQAig8wLPpIUORuf7Kjcw3BE6Zg==", "product"=>{"title"=>"fafa", "description"=>"", "advertising_text"=>"", "fancy_quote"=>""}, "option"=>{"price"=>"", "size"=>"", "weight"=>"", "material"=>""}, "option_pic"=>{"product_image"=>"level-3-on-rails-for-zombies-2-0eaaf0109f83459c5aedef30bdf8bd96.png"}, "commit"=>"Create Product"}
(0.1ms) BEGIN
SQL (0.3ms) INSERT INTO "products" ("title", "description", "advertising_text", "fancy_quote", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5, $6) RETURNING "id" [["title", "fafa"], ["description", ""], ["advertising_text", ""], ["fancy_quote", ""], ["created_at", "2015-08-07 09:25:31.365739"], ["updated_at", "2015-08-07 09:25:31.365739"]]
(0.3ms) COMMIT
(0.1ms) BEGIN
SQL (0.2ms) INSERT INTO "options" ("size", "material", "product_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5) RETURNING "id" [["size", ""], ["material", ""], ["product_id", 29], ["created_at", "2015-08-07 09:25:31.369112"], ["updated_at", "2015-08-07 09:25:31.369112"]]
(0.3ms) COMMIT
(0.1ms) BEGIN
(0.1ms) COMMIT
(0.1ms) BEGIN
SQL (0.3ms) INSERT INTO "option_pics" ("product_image", "option_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4) RETURNING "id" [["product_image", nil], ["option_id", 21], ["created_at", "2015-08-07 09:25:31.372492"], ["updated_at", "2015-08-07 09:25:31.372492"]]
(0.3ms) COMMIT
Redirected to http://localhost:3000/products
Completed 302 Found in 10ms (ActiveRecord: 2.1ms)
【问题讨论】：
-
显示上传表单的代码 (ERB)。
-
显示您的请求真正收到的参数 - 复制来自
log/development.log的行。嵌套参数处理似乎有错误。 -
也添加了它们（图片网址似乎在参数哈希中）
-
是的，我是对的。为您添加了答案。
标签： ruby-on-rails file-upload carrierwave