无法在视图Rails 4中显示我的类别和子类别 [英] Can't display my category and subcategory in the views Rails 4

问题描述

我的网站有类别和子类别，这里是我在我的seeds.rb，我创建一个主类别称为视频和动画和4个子类别，而不是我将子类别分配到主类别。 p>

  @category = Category.create！（name：Video and animation）
 
 [Intro ，动画和3D，编辑和后期制作，其他] 
 
 @subcategory = Subcategory.create！（name：name，category_id：@ category.id）
 
 end 
  

在我的rails控制台，我看到一切正常，添加的产品的category_id更改为一个数字（应为整数）。

问题：如何在我的视图中显示类别，所以当有人点击时，他会获得该类别的所有产品。
如何显示所有的子类别遵循同样的原则。
这是我试图加入我的意见

 <％Category.all.each do | ％> 
<％= link_to category.name，gigs_path（category：category.name）％> 
<％end％> 
<％Subcategory.all.each do | subcategory | ％> 
<％= link_to subcategory.name，gigs_path（subcategory：subcategory.name）％> 
<％end％> 
  

奇怪的是，当我把我的产品控制器
this

  def index 
 @category_id = Category.find_by（name：params [：category]）
 @gigs = Gig。 where（category_id：@category_id）.order（created_at DESC）
 @subcategory_id = Subcategory.find_by（name：params [：subcategory]）
 @gigs = Gig.where（subcategory_id：@subcategory_id） .order（created_at DESC）
 end 
  

它只显示所需的子类别我想，但主要类别保持空。
如果我把它改为我的控制器

  def index 
 @category_id = Category.find_by name：params [：category]）
 @subcategory_id = Subcategory.find_by（name：params [：subcategory]）
 @gigs = Gig.where（category_id：@category_id）.order（created_at DESC ）
 end 
  

主类别根据需要工作，但子类别保持为空。 / p>

注意：在这两种情况下，在任何人点击任何内容之前，我会看到正确的类别和子类别。

这是我在3个模型中的每一个

  class Category< ActiveRecord :: Base 
 has_many：subcategories 
 end 
 
 class Subcategory< ActiveRecord :: Base 
 belongs_to：category 
 has_many：products 
 end 
 
 class Product< ActiveRecord :: Base 
 acts_as_votable 
 belongs_to：user 
 belongs_to：subcategory 
 has_attached_file：image，：styles => {：medium => 300x300> } 
 validates_attachment_content_type：image，：content_type => /\Aimage\/.*\Z/ 
 end 
  

感谢您的时间。

解决方案

b
$ b

  @categories = Category.includes（：subcategories）
  

添加视图

 <％@ categories.each do | category | ％> 
<％= link_to category.name，gigs_path（category：category.name）％> 
<％category.subcategories.each do | subcategory | ％> 
<％= link_to subcategory.name，gigs_path（subcategory：subcategory.name）％> 
<％end％> 
<％end％> 
  

更改控制器中的索引方法

  def index 
 if params [：category] ​​
 c_id = Category.find（name：params [：category]）
 @gigs = Gig.where（category_id：c_id）.order（created_at DESC）
 elsif params [：subcategory] ​​
 subc_id = Subcategory.find（name：params [：subcategory]）
 @gigs = Gig.where（subcategory_id：subc_id）.order（created_at DESC）
 end 
 end 
  

My website has Categories and subcategories,here is what i have in my seeds.rb,there i create a main category called "Video and animation",and 4 subcategories,than i assign the subcategories to the main category.

@category = Category.create!(name:  "Video and animation")

["Intro", "Animation & 3D", "Editing and Post Production", "Other"].each do |name|

@subcategory = Subcategory.create!(name: name, category_id: @category.id)

end

It works well,in my rails console i see that everything works,the category_id for the added products changes to a number(integer as it should).

Question: How do i show the category in my views,so when someone clicks on that he gets all the products of that category. And how do i show all the subcategories following the same principle. Here is what i tried to put into my views

<% Category.all.each do |category| %>
  <%= link_to category.name, gigs_path(category: category.name) %>
<% end %>
<% Subcategory.all.each do |subcategory| %>
  <%= link_to subcategory.name, gigs_path(subcategory: subcategory.name) %>
<% end %>

The weird thing is that when i put in my product controller this

def index
      @category_id = Category.find_by(name: params[:category])
      @gigs = Gig.where(category_id: @category_id).order("created_at DESC")
      @subcategory_id = Subcategory.find_by(name: params[:subcategory])
      @gigs = Gig.where(subcategory_id: @subcategory_id).order("created_at DESC")
  end 

It shows just the required subcategories,as i want,but the main category remains empty. and if i put instead this into my controller

def index
      @category_id = Category.find_by(name: params[:category])
      @subcategory_id = Subcategory.find_by(name: params[:subcategory])
      @gigs = Gig.where(category_id: @category_id).order("created_at DESC")
  end

The main category works,as required,but the subcategories remain empty.

Note: In both cases,in the views,before anyone clicks on anything,i see the proper category and subcategories displayed.

Here is what i have in each of the 3 models

class Category < ActiveRecord::Base
  has_many :subcategories
end

class Subcategory < ActiveRecord::Base
  belongs_to :category
  has_many :products
end

class Product < ActiveRecord::Base
  acts_as_votable
  belongs_to :user
  belongs_to :subcategory
  has_attached_file :image, :styles => { :medium => "300x300>" }
  validates_attachment_content_type :image, :content_type => /\Aimage\/.*\Z/
end

Thank you for your time.

解决方案

In controller action

@categories = Category.includes(:subcategories)

Add In views

<% @categories.each do |category| %>
     <%= link_to category.name, gigs_path(category: category.name) %>
     <% category.subcategories.each do |subcategory| %>
          <%= link_to subcategory.name, gigs_path(subcategory: subcategory.name) %>
     <% end %>
<% end %>

Change your index method in controller

def index
    if params[:category]
        c_id = Category.find(name: params[:category])
        @gigs = Gig.where(category_id: c_id).order("created_at DESC")
    elsif params[:subcategory]    
        subc_id = Subcategory.find(name: params[:subcategory])
        @gigs = Gig.where(subcategory_id: subc_id).order("created_at DESC")
    end    
end

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