Ruby on rails 在Rails中显示数据库值？_Ruby On Rails_Ruby

Ruby on rails 在Rails中显示数据库值？

ruby-on-rails ruby

Ruby on rails 在Rails中显示数据库值？,ruby-on-rails,ruby,Ruby On Rails,Ruby,我的桌子是： | 1 | Electronics | Cameras | 2 | Electronics | Computers | 3 | Electronics | Mobile Phone | 4 | Electronics | Sound & Vision | 5 | Clothes | womens clothing | 7 | Clothes | wome

我的桌子是：

|  1 | Electronics     | Cameras         
|  2 | Electronics     | Computers       
|  3 | Electronics     | Mobile Phone    
|  4 | Electronics     | Sound & Vision  
|  5 | Clothes         | womens clothing 
|  7 | Clothes         | women shoes     
|  8 | Clothes         | women hand bags 
|  9 | Clothes         | Mens clothing   
| 10 | Clothes         | Kids clothing

我试图在我的索引页上显示如下链接：

**Electronics**
Computers
Mobile Phone 
Sound & Vision
**Clothes**
womens clothing
women shoes 
Mens clothing

class Category < ActiveRecord::Base
  has_many :products
   attr_accessible :division,:subdivision
  end 


class Product < ActiveRecord::Base
        has_many :photos,:dependent => :destroy
        has_many :line_items, :through => :product_id
        belongs_to :merchant
        belongs_to  :category
        attr_accessor :quantity
        accepts_nested_attributes_for :photos, :line_items

我该怎么做

我的模型是这样的：

**Electronics**
Computers
Mobile Phone 
Sound & Vision
**Clothes**
womens clothing
women shoes 
Mens clothing

class Category < ActiveRecord::Base
  has_many :products
   attr_accessible :division,:subdivision
  end 


class Product < ActiveRecord::Base
        has_many :photos,:dependent => :destroy
        has_many :line_items, :through => :product_id
        belongs_to :merchant
        belongs_to  :category
        attr_accessor :quantity
        accepts_nested_attributes_for :photos, :line_items

类别：销毁
有多个：行\u项，：至=>：产品\u id
属于：商人
属于：类别
属性存取器：数量
接受\u嵌套的\u属性\u用于：照片、：行\u项目

类别表是父项，产品具有

Category\u id

。仅当存在任何产品且我的产品型号如下所示时，我希望以上述方式显示类别：

**Electronics**
Computers
Mobile Phone 
Sound & Vision
**Clothes**
womens clothing
women shoes 
Mens clothing

class Category < ActiveRecord::Base
  has_many :products
   attr_accessible :division,:subdivision
  end 


class Product < ActiveRecord::Base
        has_many :photos,:dependent => :destroy
        has_many :line_items, :through => :product_id
        belongs_to :merchant
        belongs_to  :category
        attr_accessor :quantity
        accepts_nested_attributes_for :photos, :line_items

当我点击链接显示链接时，我计划显示所有相关产品

有人能告诉我如何显示有产品的类别吗？

您可以使用Enumerable#group by轻松完成此操作

传递给group_的块将被计算，每个计算为相同值的记录将被分组在一个哈希键下，您可以使用该哈希键进行循环。每个

这都是一个视图问题。你能告诉我们你的视图/控制器文件是什么样子的吗？我还没有创建视图。但是在我的类别中，控制器看起来像这样，我在show.html.erb中看到了数据。但是我不知道如何在我的主页index.html.erb pageclass CategoryController

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