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Rails3-嵌套对象表单(重用地址模型)

activerecord ruby-on-rails mysql

christo16 · 技术社区 · 14 年前

我有一个商业模式和一个地址模式。为了使事情更复杂,我还有一个位置模型。一个企业可以有多个地址,但只能有一个邮寄地址。

这是一个简单的目标图。

-姓名

位置
-商业

-地址

我想对这两个业务和地点重复使用地址模型。我需要做些什么。如果有帮助的话,我用的是MySQL。

首先我如何构造模型?我需要有很多:地点,:业务(地点/业务)?

谢谢!

2 回复 | 直到 14 年前

Patrick Robertson 14 年前

我将从一些基本的模型代码开始,然后转到控制器,然后是视图。

首先是模型:

#app/models/business.rb
class Business < ActiveRecord::Base
  has_one :mailing_address, :class_name => "Address", :dependent => :destroy
  accepts_nested_attributes_for :mailing_address

  has_many :locations
  accepts_nested_attributes_for :locations
end

#app/models/location.rb
class Location < ActiveRecord::Base
  has_one :address, :dependent => :destroy
  accepts_nested_attributes_for :address

  belongs_to :business
end

#app/models/address.rb
class Address < ActiveRecord::Base
  belongs_to :business
  belongs_to :location
end

#app/controllers/businesses_controller.rb#new
def new
  @business = Business.new

  mailing_address = @business.build_mailing_address
  3.times do
    location = @business.locations.build
    address = location.build_address
  end
  respond_to do |format|
    format.html # new.html.erb
    format.xml  { render :xml => @business }
  end
end

#app/views/businesses/_form.html.erb
<%= form_for(@business) do |f| %>
  <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </div>
  <%= f.fields_for :mailing_address do |builder| %>
    <h3>Mailing Address</h3>
    <%= render "address_fields", :f => builder %>
  <% end %>
  <%= f.fields_for :locations do |builder| %>
    <h3>Location</h3>
    <%= render "locations_fields", :f => builder %>
    <%= builder.fields_for :address do |mini_builder| %>
      <h3>Location Address</h3>
      <%= render "address_fields", :f => mini_builder %>
    <% end%>
  <% end %>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

地址部分:

#app/views/businesses/_address_fields.html.erb
<p>
  <%= f.label "Street Address"%>
  <%= f.text_field :street %>
  <%= f.label "City"%>
  <%= f.text_field :city %>
  <%= f.label "State"%>
  <%= f.text_field :state %>
  <%= f.label "Zip"%>
  <%= f.text_field :zip %>  
</p>

部分位置:

#app/views/businesses/_location_fields.html.erb
<p>
  <%= f.label "Location Name"%>
  <%= f.text_field :name%>
</p>

如果希望从与业务地址关联的位置集合中填充业务邮件地址,则可以在业务模型中添加一个方法,该方法执行以下操作:

#app/models/business.rb#possible_mailing_addresses
def possible_mailing_addresses
  Location.where(:business_id=>self.id).joins(:address)
end

Chowlett 14 年前

关于模型,您可能需要这样的东西:

class Business < ActiveRecord::Base
  has_many :locations
  has_many :addresses, :through => :locations do
    def mailing
      find_by_is_mailing_address(true)
    end
  end
end

class Location < ActiveRecord::Base
  has_one :address
  belongs_to :business
end

class Address < ActiveRecord::Base
  belongs_to :location
  belongs_to :business, :through => :location      
end

... 这给了你 my_business.addresses.mailing

然后在 addresses is_mailing_address ,你设置的 true 仅限于其业务的邮寄地址。您还应该在 Address 是邮寄地址吗 每一项业务。

红宝石专家 :我相信你会有生意的 has_one :mailing_address 使用 :through => :locations :source ,但我不明白做。也许你能启发我们两个?