我的主要问题是，当通过carrierwave上传文件时，文件并未真正上传。
我的控制台输出：
cmd对图像的调用如下：
#<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>]>
如果我检查网页上的元素，这就是我得到的：
-@product.options.each do |option|
-option.option_pics.each do |op|
=image_tag op.image_url.to_s
然而，上传者的设置如下：
<img src="/images/game_of_thrones___tyrion_lannister_by_stanbos-d79k0u9_modified.jpg" alt="Game of thrones tyrion lannister by stanbos d79k0u9 modified">毋庸置疑，我既没有在assets / images文件夹中创建图像，也没有创建公共/上传文件夹。
这完全适用于我的其他项目（使用与上面相同的语法创建public / uploads文件夹），其中图像作为单独的模型存储。在我目前的项目中，我希望它们作为产品类的子选项。
结构如下：
模型 - 产品，选项，optionpic（ture）
产品可以有很多选项，反过来一个选项可以有很多图片。例如 - 产品是T恤。选项包括：材料和颜色。对于每种颜色，我想要一张不同的衬衫图片。
这就是我在ProductsController中拥有所有内容的原因：
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
我的optionpic（ture）模型：
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
我想我只是犯了一些愚蠢的新手错误，但经过几个小时的搜索后我才弄清楚出了什么问题。
我想出了两件事 - 我使用了image_url而不是picture_image而忘记在控制器中实际保存option_picture值，即class OptionPic < ActiveRecord::Base
mount_uploader :product_image, ProductImageUploader
belongs_to :option
end
现在上传时没有数据传输：
@option_pic.save我将每个值从：image_url更新为：product_image（在视图中，在pic_params等中）
根据要求，我上传表格：
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"]]
根据要求，我的日志参数
%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
答案 0 :(得分：0)
您没有正确访问params值。以下将解决这个问题：
def pic_params
params.require(:option_pic).require(:product_image)
end
此外，您必须在构建OptionPic时使其属于您的选项：
def new
@product = Product.new
@option = @product.options.new
@option_pic = @option.option_pics.new
end
答案 1 :(得分：0)
如果有人遇到同样的问题，我会发布我的解决方案 - 我决定使用嵌套属性重新创建这个系统，现在一切正常！
所以这里有我的3个模型：
class Product < ActiveRecord::Base
belongs_to :category
belongs_to :subcategory
has_many :options
has_and_belongs_to_many :product_sizes
accepts_nested_attributes_for :options
end
选项类，它是产品的子级
class Option < ActiveRecord::Base
belongs_to :product
has_many :option_pics
accepts_nested_attributes_for :option_pics
end
最后是option_pic，一个选项的子项
class OptionPic < ActiveRecord::Base
mount_uploader :product_image, ProductImageUploader
belongs_to :option
end
在产品控制器中，我的新操作和创建操作如下所示：
def new
@product = Product.new
option = @product.options.build
option_pic = option.option_pics.build
end
def edit
end
def create
@product = Product.new(product_params)
if @product.save!
flash[:success] = "Product successfully created!"
redirect_to products_path
end
end
private
def product_params
params.require(:product).permit(
:title, :description, :advertising_text, :fancy_quote, :category_id,
options_attributes: [:size, :weight, :price, :material, :product_id,
option_pics_attributes: [:product_image, :option_id]])
end
def find_product
@product = Product.find(params[:id])
end
字符串参数是双嵌套的，这很重要。 form_for帮助器的结构也很重要。我没有重构它，所以现在它是一个大的列表。那里的结构非常重要，我把我的字段用于option_pic，用于＆＃34; f＆＃34;变量，这是至关重要的，没有上传图像。
=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
%br
=f.label :category_id
=f.collection_select :category_id, Category.all, :id, :title, { prompt: 'Please select category' }
%br
=f.label 'Product Size'
=f.collection_check_boxes(:product_size_ids, ProductSize.all, :id, :size)
%p
= f.fields_for :options do |builder|
=builder.label :price
=builder.text_field :price
%br
=builder.label :size
=builder.text_field :size
%br
=builder.label :weight
=builder.text_field :weight
%br
=builder.label :material
=builder.text_field :material
%br
=builder.fields_for :option_pics do |op|
= op.label 'Upload image'
= op.file_field :product_image
=f.submit
瞧，这是一个很棒的承诺：
(0.1ms) BEGIN
SQL (0.4ms) INSERT INTO "products" ("title", "description", "advertising_text", "fancy_quote", "category_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5, $6, $7) RETURNING "id" [["title", "builder"], ["description", ""], ["advertising_text", ""], ["fancy_quote", ""], ["category_id", 1], ["created_at", "2015-08-11 11:34:11.618298"], ["updated_at", "2015-08-11 11:34:11.618298"]]
SQL (0.2ms) INSERT INTO "options" ("size", "price", "material", "product_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5, $6) RETURNING "id" [["size", ""], ["price", 555], ["material", ""], ["product_id", 82], ["created_at", "2015-08-11 11:34:11.619678"], ["updated_at", "2015-08-11 11:34:11.619678"]]
SQL (0.5ms) INSERT INTO "option_pics" ("product_image", "option_id", "created_at", "updated_at") VALUES ($1, $2, $3, $4) RETURNING "id" [["product_image", "b3c839_bd43d840e031469495137fa74e31faf4.jpg_srz_428_428_75_22_0.5_1.2_75_jpg_srz"], ["option_id", 66], ["created_at", "2015-08-11 11:34:11.620837"], ["updated_at", "2015-08-11 11:34:11.620837"]]
(0.3ms) COMMIT