您好我有2个型号Product和ProductSize。我在Product表单中创建了ProductSize。
问题是，它不能持久创建ProductSizes。您应该能够访问product.product_sizes并显示ProductSizes列表。
product.rb
class Product < ActiveRecord::Base
acts_as_taggable
belongs_to :user
belongs_to :category
has_many :product_sizes
has_many :product_images, :dependent => :destroy
validates :title, presence: true, length: { maximum: 30 }
validates :description, presence: true, length: { maximum: 2000 }
validates :category, :user, :price, presence: true
accepts_nested_attributes_for :product_images, :product_sizes, allow_destroy: true
end
product_size.rb
class ProductSize < ActiveRecord::Base
belongs_to :product
belongs_to :size
validates :quantity, presence: true
end
这是我的表格。它的工作方式是：用户可以上传图像，然后选择产品的类别。让我们说他们选择衬衫，然后所有衬衫尺寸的列表将下降像XS，小，中，大。然后，用户将他们拥有的数量放在他们拥有的尺寸上。比如13件XS衬衫和4件大衬衫。
<%= javascript_include_tag "custom" %>
<div class="container">
<div class=“row”>
<div class="col-md-6 col-md-offset-3">
<div class="panel panel-primary">
<div class="panel-body">
<%= simple_nested_form_for @product do |f| %>
<%= f.fields_for :product_images do |product_image| %>
<% if product_image.object.new_record? %>
<%= product_image.file_field(:product_image) %>
<%= product_image.link_to_remove "Remove Image", data: { confirm: "Are you sure you want to delete this image?" } %>
<% else %>
<%= product_image.hidden_field :_destroy %>
<% end %>
<% end %>
<p><%= f.link_to_add "Add a image", :product_images, :data => { :product_image => "#product_images" } %></p>
<%= f.collection_select :category_id, @categories, :id, :name, include_blank: true, prompt: "Select One Category" %>
<% @categories.each do |category| %>
<div class='sizes_container' id ='sizes_container_for_<%= category.id %>'>
<% category.sizes.each do |size| %>
<%= label_tag "product_form[sizes_by_id][#{size.id}]", size.title %>
<%= text_field_tag "product_sizes_attributes[sizes_quantity][#{size.id}]" %>
<% end %>
</div>
<% end %>
<%= f.input :title, label:"Title"%>
<%= f.input :price, label:"Price"%>
<%= f.input :description,label:"Description" %>
<%= f.input :size_description, label:"Size Details"%>
<%= f.input :shipping_description, label:"Shipping Details"%>
<%= f.input :tag_list,label:"Tags - Seperate tags using comma ','. 5 tags allowed per product" %>
<%= f.button :submit, "Create new product", class: "btn-lg btn-success" %>
<% end %>
</div>
</div>
</div>
</div>
</div>
以下是我的参数在创建动作中的样子。
36: def create
=> 37: binding.pry
38: @product = Product.new product_params
39: @product.user_id = current_user.id
40: if @product.save
41: redirect_to @product
42: flash[:success] = "You have created a new product"
43: else
44: flash[:danger] = "Your product didn't save"
45: render "new"
46: end
47: end
**[1] pry(#<ProductsController>)> product_params**
=> {"title"=>"test",
"price"=>"3325",
"description"=>"test",
"tag_list"=>"test",
"category_id"=>"3",
"size_description"=>"test",
"shipping_description"=>"test",
"product_images_attributes"=>
{"0"=>
{"product_image"=>
#<ActionDispatch::Http::UploadedFile:0x007f8cb786a010
@content_type="image/jpeg",
@headers="Content-Disposition: form-data; name=\"product[product_images_attributes][0][product_image]\"; filename=\"780069_black_l.jpg\"\r\nContent-Type: image/jpeg\r\n",
@original_filename="780069_black_l.jpg",
@tempfile=#<File:/var/folders/yx/znmx6qfj0c507bvkym6lvhxh0000gn/T/RackMultipart20151223-46388-p07o84.jpg>>,
"_destroy"=>"false"},
"1450863732810"=>
{"product_image"=>
#<ActionDispatch::Http::UploadedFile:0x007f8cb7869e08
@content_type="image/jpeg",
@headers="Content-Disposition: form-data; name=\"product[product_images_attributes][1450863732810][product_image]\"; filename=\"20090a.jpg\"\r\nContent-Type: image/jpeg\r\n",
@original_filename="20090a.jpg",
@tempfile=#<File:/var/folders/yx/znmx6qfj0c507bvkym6lvhxh0000gn/T/RackMultipart20151223-46388-n9mzf2.jpg>>,
"_destroy"=>"false"}}}
[2] pry(#<ProductsController>)> params
=> {"utf8"=>"✓",
"authenticity_token"=>"jfh6vsb1N1zhAIFyzer4liwuV+iHQ+P8pF6mZHUyF8IXNn6oXqnLDse84jnrP3BKI889CWigIDqVMJncxOYZ9Q==",
"product"=>
{"product_images_attributes"=>
{"0"=>
{"product_image"=>
#<ActionDispatch::Http::UploadedFile:0x007f8cb786a010
@content_type="image/jpeg",
@headers="Content-Disposition: form-data; name=\"product[product_images_attributes][0][product_image]\"; filename=\"780069_black_l.jpg\"\r\nContent-Type: image/jpeg\r\n",
@original_filename="780069_black_l.jpg",
@tempfile=#<File:/var/folders/yx/znmx6qfj0c507bvkym6lvhxh0000gn/T/RackMultipart20151223-46388-p07o84.jpg>>,
"_destroy"=>"false"},
"1450863732810"=>
{"product_image"=>
#<ActionDispatch::Http::UploadedFile:0x007f8cb7869e08
@content_type="image/jpeg",
@headers="Content-Disposition: form-data; name=\"product[product_images_attributes][1450863732810][product_image]\"; filename=\"20090a.jpg\"\r\nContent-Type: image/jpeg\r\n",
@original_filename="20090a.jpg",
@tempfile=#<File:/var/folders/yx/znmx6qfj0c507bvkym6lvhxh0000gn/T/RackMultipart20151223-46388-n9mzf2.jpg>>,
"_destroy"=>"false"}},
"category_id"=>"3",
"title"=>"test",
"price"=>"3325",
"description"=>"test",
"size_description"=>"test",
"shipping_description"=>"test",
"tag_list"=>"test"},
"product_sizes_attributes"=>{"sizes_quantity"=>{"1"=>"3", "2"=>"4", "3"=>""}},
"commit"=>"Create new product",
"controller"=>"products",
"action"=>"create"}
[3] pry(#<ProductsController>)> params[:product_sizes_attributes]
=> {"sizes_quantity"=>{"1"=>"3", "2"=>"4", "3"=>""}}
答案 0 :(得分：1)
您的表单看起来没有fields_for的{{1}}：
product_sizes必须使用适当的控制器代码进行备份：
<%= simple_nested_form_for @product do |f| %>
<%= f.fields_for :product_sizes do |product_size| %>
<%= product_size.text_field .... %>
<% end %>
<% end %>
这应该让它适合你。
答案 1 :(得分：0)
fields_for使用project_size。从@sizes获取总@categories并使用之前使用过的collection_select。您的project_size表单代码
<% @categories.each do |category| %>
<div class='sizes_container' id ='sizes_container_for_<%= category.id %>'>
<% category.sizes.each do |size| %>
<%= label_tag "Size"product_form[sizes_by_id][#{size.id}]", size.title %>
<%= text_field_tag "product_sizes_attributes[sizes_quantity][#{size.id}]" %>
<% end %>
</div>
<% end %>
将是
<% @sizes = Size.joins(:category).where('categories.id IN (?)', @categories.map(&:id)) %>
<%= f.fields_for :product_sizes do |product_size| %>
<%= label_tag "Size" %>
<%= product_size.collection_select :size_id, @sizes, :id, :title, include_blank: true, prompt: "Select One Size" %>
<%= product_size.text_field :quantity %>
<% end %>
而product_params将是
params.require(:product).permit(:title, :price, :description, :tag_list,:category_id, :size_description, :shipping_description, product_images_attributes: [:id, product_image: [] ], product_sizes_attributes: [:id, :size_id, :quantity])
我希望这会有所帮助。