Rails 使用 has_many :through 编辑联接 table 的附加字段

Question

我遇到的问题与此处几乎完全相同： Rails has_many :through saving additional fields

但是我无法弄清楚我的代码中缺少什么。基本结构如下：有产品，它们可能有附加服务（如清洁或磨锐）。每项服务的基本价格相同，但产品可能有不同的系数。比方说，产品 1 可能有锐化基本价格 * 1.5，产品 2 可能有锐化基本价格 * 2。连接 table 有点愚蠢 - 服务，我想不出一个像样的名字。

products_controller.rb:

def update
  @product.update!(product_params)
  redirect_to @product
end

def product_params
    params.require(:product).permit(
    :title, :description, :advertising_text, :fancy_quote, :hot, :hotpic, :product_size_ids, 
    { volume_ids: [] }, { color_ids: [] }, { addservice_ids: [] }, :category_id, :subcategory_id, 
    options_attributes: [:size, :weight, :price, :material, :product_id],
    images_attributes: [ :image, :product_id ],
    servizations_attributes: [:coefficient, :product_id, :addservice_id]
    )
end

产品型号（我删掉了不相关的部分）：

class Product < ActiveRecord::Base
 has_many   :servizations
 has_many   :addservices, through: :servizations

 accepts_nested_attributes_for :servizations

 before_destroy :ensure_not_referenced_by_any_line_item

结束

附加服务模型：

class Addservice < ActiveRecord::Base
    has_many :servizations
    has_many :products, through: :servizations
end

服务模式

class Servization < ActiveRecord::Base
    belongs_to :product
    belongs_to :addservice
end

这是我的 edit.html.haml:

=form_for @product do |f|
                =f.label 'Title'
                =f.text_field :title
                %p
                =f.label 'Colors'
                =collection_check_boxes(:product, :color_ids, Color.all, :id, :value )
                %p
                =f.label 'Additional services'
                =collection_check_boxes(:product, :addservice_ids, Addservice.all, :id, :title)
                =f.fields_for :servization do |s|
                    =s.label 'Coefficient'
                    =s.text_field :coefficient
                %p
                    =f.submit class: 'btn btn-default'

我在保存普通服务或仅保存颜色时没有问题，但是当我尝试编辑和保存系数时，我收到以下错误：

Processing by ProductsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"jLN59PIOgpaIQtg2/rVYcK/xUOCFzSMLosfUhOslY9tNNhjFbh16Aa1/qT/8u7LHuhNTLGr2SB7b/BitekuDJQ==", "product"=>{"title"=>"Power MI", "color_ids"=>["1", "2", "3", ""], "addservice_ids"=>["1", ""], "servization"=>{"coefficient"=>"1.5"}}, "commit"=>"Update Product", "id"=>"7"}
  Product Load (0.3ms)  SELECT  "products".* FROM "products" WHERE "products"."id" =  LIMIT 1  [["id", 7]]
Unpermitted parameter: servization

服务结构：

Servization(id: integer, product_id: integer, addservice_id: integer, coefficient: float, created_at: datetime, updated_at: datetime)

我不明白...我的选项保存得很好，图片也保存得很好。但是附加服务拒绝保存。

编辑 1： 我想我可能已经接近解决方案了。问题是表单中的正确链接。这是我到目前为止想出的：

    =form_for @product do |f|
        %p
            =f.label "Additional Services"
        %br
        -Addservice.all.each do |addservice|
            =check_box_tag "product[addservice_ids][]", addservice.id, @product.addservice_ids.include?(addservice.id)
            =addservice.title
            =text_field_tag "product[servizations][coefficient][]", addservice.servizations.where(product_id: @product.id)[0].coefficient
            %br
        %p
            =f.submit class: 'btn btn-default'

这是补丁请求：

Parameters: {"utf8"=>"✓", "authenticity_token"=>"wD8uMSu0TxvumAWcs1V6GtAFeNgYhbEPEh8HuV8RWucBuk8At6e3jMuldJWxW5Ctxed7FPe+2hprJMuQzn+6GQ==", "product"=>{"title"=>"Флешеченка на тристапяцот гигов", "color_ids"=>["1", "2", "3", ""], "addservice_ids"=>["1", "2"], "servizations"=>{"coefficient"=>["4", "5"]}}, "commit"=>"Update Product", "id"=>"5"}

然而现在我又开始了

Unpermitted parameter: servizations

错误

Answer 1

问题出在这一行

=f.fields_for :servization do |s|

应该是

=f.fields_for :servizations do |s|

更新：

您应该允许 :id 以便 update 正常工作

def product_params
    params.require(:product).permit(
    :title, :description, :advertising_text, :fancy_quote, :hot, :hotpic, :product_size_ids, 
    { volume_ids: [] }, { color_ids: [] }, { addservice_ids: [] }, :category_id, :subcategory_id, 
    options_attributes: [:size, :weight, :price, :material, :product_id],
    images_attributes: [ :image, :product_id ],
    servizations_attributes: [:id, :coefficient, :product_id, :addservice_id]
    )
end

Rails 使用 has_many :through 编辑联接 table 的附加字段

Rails edit additional fields of a join table using has_many :through

ruby-on-rails

nested-forms

nested-attributes

jointable