0

你好我有这个模型

模型/商店/store.rb

class Store::Store < ActiveRecord::Base
  attr_accessible :name
  has_many :store_products
  has_many :products, :through => :store_products
end

模型/product.rb

class Product < ActiveRecord::Base
  attr_accessible :name ...
  has_many :store_products
  has_many :stores, :through => :store_products
end

模型/商店/store_product.rb

class Store::StoreProduct < ActiveRecord::Base
    set_table_name "stores_products"
    attr_accessible :store_id, :product_id
    belongs_to :store
    belongs_to :product
end

我通过发布到控制器操作获取参数 ['store_ids']

>> params['store_ids']
=> ["1", "2"]

我在哪里有这个代码

>> @products = Product.joins(:stores).where("stores.id IN (?)", params[:store_ids])

它抛出错误 #<NameError: uninitialized constant Product::StoreProduct>

我该如何解决这个问题（仅在某些商店中选择产品）？：-） 谢谢

编辑：更多信息：

文件夹结构

app/controllers/store/main_controller.rb
app/controllers/store/stores_controller.rb

app/models/store/store.rb
app/models/store/store_product.rb
app/models/product.rb

代码在

class Store::MainController < ApplicationController
def index
  if params['store_ids'] then 
       @products = Product.joins(:stores)...
  else
      @products = Product.paginate page: params[:page], order: 'name asc', per_page: 10
  end
end

DB Schema 的一部分： stores_products

id
product_id
store_id

产品

id
name
...

商店

id
name
...

解决方案（感谢 Gotva）

class Product < ActiveRecord::Base
  attr_accessible :name, ...

  has_many :store_products, class_name: "Store::StoreProduct"
  has_many :stores, :through => :store_products
end

class Store::Store < ActiveRecord::Base
  attr_accessible :name
  has_many :store_products, class_name: "Store::StoreProduct"
  has_many :products, :through => :store_products
end

class Store::StoreProduct < ActiveRecord::Base
    set_table_name "stores_products"
    attr_accessible :store_id, :product_id

    belongs_to :store, class_name: "Store::Store"
    belongs_to :product, class_name: "Product"
end

最后

@products = Product.joins(:stores).where("stores.id IN (?)", params[:store_ids]).paginate(page: params[:page], order: 'products.name asc', per_page: 10)
4

1 回答 1

1

尝试这个

@products = Product.joins(:stores).where("#{Store::Store.table_name}.id IN (?)", params[:store_ids]).paginate(page: params[:page], order: 'name asc', per_page: 10)

也许它会重复产品，所以在uniq之后添加方法where，这适用distinct于查询

于 2013-09-22T20:06:58.733 回答