在 Rails 中为业务模型添加多个类别

Question

我正在尝试设置一个具有业务模型和类别模型的 Rails 应用程序。一个企业可以有多个类别，并且这些类别可以属于多个企业。

一切似乎工作正常，我没有收到任何错误，除非尝试显示与特定业务相关的类别时没有显示任何内容。

以下是我的模型、控制器和视图。这是我的第一个 Rails 项目之一，正在寻求帮助。

business.rb

class Business < ActiveRecord::Base

  attr_accessible :category_id
  belongs_to :category

end

category.rb

class Category < ActiveRecord::Base

  attr_accessible :name, :description
  has_many :businesses

end

business_controller.rb

def show
  @business = Business.find(params[:id])
  @categories = Category.where(:business_id => @business).all

  respond_to do |format|
    format.html # show.html.erb
    format.json { render json: @business }
  end
end

def new
  @business = Business.new
  @categories = Category.order(:name)

  respond_to do |format|
    format.html # new.html.erb
    format.json { render json: @business }
  end
end

def edit
  @business = Business.find(params[:id])
  @categories = Category.order(:name)
end

business/_form.html.erb

...

<div class="field">
    <%= f.association :category, input_html: { class: 'chosen-select', multiple: true } %>
</div>

...

business/show.html.erb

...

<ul class="tags">
  <% @categories.each do |category| %>
    <li><%= category.name %></li>
  <% end %>
</ul>

...

Answer 1

鉴于您希望企业拥有多个类别，您的模型的关系应更新如下：

商业

def Business < ActiveRecord::Base
  has_many :categories
  attr_accessible :name, :etc
  # attr_accessible :category_id would not apply as the business model 
  # would not have this relationship
end

类别

def Category < ActiveRecord::Base
  attr_accessible :business_id, :name, :description
  belongs_to :business
end

然后，在您的控制器中，您可以访问数据：

BusinessesController

def show
  @business = Business.find(params[:id])
  @categories = @business.categories 
  respond_to ... 
end