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铁路3:将结果合并为一
原标题:Rails 3: Join results in a view

我再次面对着一些不应该在表面上如此困难的东西,但却把我逼疯了一个多小时左右。我有多个模型,我想把它们拉入一个索引视图中。我假设这是一个组合,但我似乎无法找到一个方法来做到这一点。

我对索引的看法是:

    <% @tips.each do |tip| %>
  <tr>
    <td><%= tip.user_id %></td>
    <td><%= tip.city_id # here I want to draw on the cities table to show city.name
         %></td>
    <td><%= tip.type_id # here I want to draw on the type table to show type.name
         %></td>
    <td><%= tip.place_id # here I want to draw on the place table to show place.name
         %></td>
    <td><%= tip.tip_desc %></td>
    <td><%= link_to  Show , tip %></td>
    <td><%= link_to  Edit , edit_tip_path(tip) %></td>
    <td><%= link_to  Destroy , tip, confirm:  Are you sure? , method: :delete %></td>
  </tr>
<% end %>

以下是模型:

class Tip < ActiveRecord::Base
  belongs_to :user
  belongs_to :city
  belongs_to :place
end

class Place < ActiveRecord::Base
  belongs_to :city
  has_and_belongs_to_many :collections
  has_many :tips
end

class City < ActiveRecord::Base
  has_many :places
  has_many :tips 
end

任何帮助都会感激不尽!

提前感谢大家,

詹姆斯·詹姆斯

最佳回答

其它人的建议应该有效。 我不确定, 但似乎您在数据库中没有指定的 ID 内的对象。 仅此而已 :

示例:

@tips.each do |tip|
  tip.city_id # 1
  City.find( tip.city_id ) # nil
end
问题回答

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