Question

我正在尝试设置具有Business模型和Category模型的rails应用程序。企业可以有多个类别，类别可以属于多个企业。

一切似乎都正常工作，我没有收到任何错误，除非在尝试显示与特定商家相关的类别时，没有显示任何错误。

以下是我的模型，控制器和视图。这是我的第一个铁轨项目之一，我正在寻求一些帮助。

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

商家/ _form.html.erb

...

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

...

商家/ 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：

商家

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

<强>分类

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：

<强> BusinessesController

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

在Rails中为业务模型添加多个类别

1 个答案: