RoR:子记录列表

Question

架构:

• persons (id, name, birthyear, gender)

• pets (id, person_id, name, leg_count)

• plants (id, person_id, kind, qty)

我想制作一份关于按人分组的这些事情的只读报告.完成人员列表(没有相关记录).我希望每个人都有"子表".就像是:

Persons
+----+------+-----------+--------+
| id | name | birthyear | gender |
+----+------+-----------+--------+
|  1 | Joe  | 1980      | M      |
+----+------+-----------+--------+
| Pets                           |
| +----+------+-----------+      |
| | id | name | Leg count |      |
| +----+------+-----------+      |
| |  1 | Rex  |         4 |      |
| +----+------+-----------+      |
| |  2 | Ka   |         0 |      |
| +----+------+-----------+      |
| Plants                         |
| +----+------------+-----+      |
| | id | kind       | qty |      |
| +----+------------+-----+      |
| |  1 | lemon tree |   2 |      |
| +----+------------+-----+      |
+----+------+-----------+--------+
|  2 | Jane | 1982      | F      |
+----+------+-----------+--------+
| Pets                           |
| +----+------+-----------+      |
| | id | name | Leg count |      |
| +----+------+-----------+      |
| |  3 | Sue  |         6 |      |
| +----+------+-----------+      |
| Plants                         |
| +----+------------+-----+      |
| | id | kind       | qty |      |
| +----+------------+-----+      |
| |  2 | Oak tree   |   1 |      |
| +----+------------+-----+      |
+----+------+-----------+--------+

能否帮我提一些建议,以及如何挂钩框架？(JRuby(1.5.0),Ruby on Rails(2.3.4),ActiveRecord(2.3.4))

做了什么

Persons
+----+------+-----------+--------+
| id | name | birthyear | gender |
+----+------+-----------+--------+
|  1 | Joe  | 1980      | M      |
+----+------+-----------+--------+
|  2 | Jane | 1982      | F      |
+----+------+-----------+--------+

它使用:

class PersonsReportController < PersonsController
  layout 'simpreport'
  active_scaffold :person do |config|
    c.columns = [:name, :birthyear, :gender, :pets, :plants ]
    c.label = "Report of people and other living creatures"
    [:pets, :plants].each do |col| 
        columns[col].clear_link
    end
    c.list.columns.exclude :pets, :plants
    c.actions.exclude :show
  end
  # ...
end

而且我也定制_list_header.rhtml,_list_column_headings.rhtml以及_list_actions.rhtml为了杀死所有交互(如排序等)一点点.

Answer 1

我不理解你在控制器中编写的代码,也不理解为什么它继承自你的PersonsController.也许你可以解释一下你想要在那里完成什么？

话虽这么说,我会像这样解决你的问题:

楷模:

person.rb:

class Person < ActiveRecord::Base
  has_many :pets
  has_many :plants

  def has_pets?
    self.pets.size > 0
  end

  def has_plants?
    self.plants.size > 0
  end

  def has_pets_or_plants?
    self.has_pets? || self.has_plants?
  end
end

pet.rb:

class Pet < ActiveRecord::Base
  belongs_to :person
end

plant.rb:

class Plant < ActiveRecord::Base
  belongs_to :person
end

控制器:

reports_controller.rb:

class ReportsController < ApplicationController
  def index
    @persons = Person.find(:all)
  end
end

视图:

报告/ index.html.erb:

Persons
<table border="1">
  <tr>
    <td>id</td>
    <td>name</td>
    <td>birthyear</td>
    <td>gender</td>
  </tr>
<% @persons.each do |person| -%>
  <tr>
    <td><%= person.id %></td>
    <td><%= person.name %></td>
    <td><%= person.birthyear %></td>
    <td><%= person.gender %></td>
  </tr>
<% if person.has_pets_or_plants? -%>
  <tr>
    <td colspan="4">
    <% if person.has_pets? -%>
      Pets
      <table border="1">
        <tr>
          <td>id</td>
          <td>name</td>
          <td>leg count</td>
        </tr>
      <% person.pets.each do |pet| -%>
        <tr>
          <td><%= pet.id %></td>
          <td><%= pet.name %></td>
          <td><%= pet.leg_count %></td>
        </tr>
      <% end -%>
      </table>
    <% end -%>
    <% if person.has_plants? -%>
      Plants
      <table border="1">
        <tr>
          <td>id</td>
          <td>kind</td>
          <td>qty</td>
        </tr>
      <% person.plants.each do |plant| -%>
        <tr>
          <td><%= plant.id %></td>
          <td><%= plant.kind %></td>
          <td><%= plant.qty %></td>
        </tr>
      <% end -%>
      </table>
    <% end -%>
    </td>
  </tr>
<% end -%>
<% end -%>
</table>