[英]Access the attributes of a sister child via the parent model
So I've been looking all over and can't seem to find the correct conceptual explanation/technical process for this, and quite possibly am approaching it incorrectly. 因此,我一直到处寻找,似乎无法为此找到正确的概念解释/技术过程,并且很可能会错误地使用它。
I have 2 child models, connected by the same parent, I want to access the attributes of CHILD B from an Index view on CHILD A :THROUGH an instance of the parent. 我有2个子模型,由同一父模型连接,我想从CHILD A的索引视图访问CHILD B的属性:通过父模型的实例。
High level overview 高层概述
Property
/ \
Order Owner
Basically I have an index page showing all the open Orders
, each Order
must have a Property
(parent) and every Property
has an owner. 基本上,我有一个索引页面,显示所有未结
Orders
,每个Order
必须有一个Property
(父对象),每个Property
都有一个所有者。 So I'm in the Orders
index page and I want to see the first_name
of the Property's Owner
, how can I access that? 因此,我在“
Orders
索引页面中,我想查看Property's Owner
的first_name
,如何访问它?
If I do something like: 如果我做类似的事情:
@order.property.owners.first_name
I get a an error undefined method
, however if I do: 我收到一个错误
undefined method
,但是如果这样做:
@order.property.owners
I don't receive an error but rather: 我没有收到错误,而是:
#<Owner::ActiveRecord_Associations_CollectionProxy:0x007f8a85368988>
shows up in my view, along with all the other correct information. 在我看来与所有其他正确信息一起出现。
Models 楷模
Property
has_many :orders
has_many :owners
accepts_nested_attributes_for :owners
Owner
belongs_to :property
Orders
belongs_to :property
has_many :owners, through: :property
accepts_nested_attributes_for :owners
Orders Controller 订单控制器
def open_orders
@open_orders = Order.where(status: "Open").paginate(page: params[:page], per_page: 15)
###@orders = Order.all
###@properties = Property.find(@orders.property.id)
###@owners = Owner.find(@properties.owners.id)
render 'orders/open'
end 结束
^ Commented out stuff I was trying but was not working, including it incase I'm just a little bit off somewhere. ^注释掉了我正在尝试但无法正常工作的东西,包括它,以防我在某处有点距离。
Open_orders
View Open_orders
视图
<% @open_orders.each do |order| %>
<tr>
<td><%= order.client_id %></td>
<td><%= order.order_number %></td>
<td><%= order.property.address1 %></td>
<td><%= order.property.owners %></td>
<td><%= order.order_update ? "Yes" : "No" %></td>
<td><%= order.status %></td>
<td><%= order.task %></td>
<td><%= order.created_at %></td>
<td><%= link_to fa_icon("edit"), edit_property_order_path(order, order.property.id), class: "m-r-xs", remote: true, data: { 'data-toggle' => "modal", 'data-target' => '#orders-modal'} %></td>
</tr>
As per your model definition, an order
has multiple owners
..thus you are getting active record collection of owners instead of single object. 根据您的模型定义,一个
order
具有多个 owners
因此,您将获得所有者的有效记录集合,而不是单个对象。
There are 2 ways to handle this, 有两种处理方法,
You must preload the owners to avoid n+1 queries 您必须预先加载所有者,以避免n + 1个查询
In your controller 在您的控制器中
@open_orders = Order.where(status: "Open").includes(:owners).paginate(page: params[:page], per_page: 15)
In your view 在您看来
<td><%= order.owners.pluck(:first_name).join(',') %></td>
Update 更新
To get the full_name
of the owner, you can define a method in your owner.rb
as 要获得
full_name
主人的,你可以在你定义一个方法owner.rb
作为
def full_name
"#{first_name} #{last_name}"
end
In your view 在您看来
<td><%= order.owners.map(&:full_name).join(',') %></td>
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