如何创建遍历多态关联的作用域？

发布于 2024-12-09 17:48:15 字数 466 浏览 1 评论 0原文

我有这些模型（伪代码）：

class Order
    has_many :line_items
end

class LineItem
    belongs_to :purchasable, :polymorphic => true
    belongs_to :order
end

class Tile
    has_one :line_item, :as => :purchasable
end

我想创建一个范围，允许我从订单访问图块。像 Order#tiles 之类的东西，这样我就可以在控制器中执行类似的操作：

my_order.tiles.new(...)
my_order.tiles.find(params[:id]).update_attributes(...)

如何构建这样的范围？（或者我应该使用其他技术吗？）

原文

I have these models (psuedocode):

class Order
    has_many :line_items
end

class LineItem
    belongs_to :purchasable, :polymorphic => true
    belongs_to :order
end

class Tile
    has_one :line_item, :as => :purchasable
end

I want to make a scope that allows me to access tiles from an order. something like Order#tiles so that I can do things like this in controllers:

my_order.tiles.new(...)
my_order.tiles.find(params[:id]).update_attributes(...)

How can I construct such a scope? (or is there another technique I should use?)

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白昼 2024-12-16 17:48:15

你们所拥有的协会不能一起工作。我想你可能正在寻找这样的东西：

class Order
  has_many :line_items
  has_many :tiles, :through => :line_items, :source => :purchasable, :source_type => "Tile"
  ...
end

class LineItem
  belongs_to :order
  belongs_to :purchasable, :polymorphic => true
  ...
end

class Tile
  has_many :line_items, :as => :purchasable
  ...
end

The associations you have don't work together. I think you might be looking for something like this:

class Order
  has_many :line_items
  has_many :tiles, :through => :line_items, :source => :purchasable, :source_type => "Tile"
  ...
end

class LineItem
  belongs_to :order
  belongs_to :purchasable, :polymorphic => true
  ...
end

class Tile
  has_many :line_items, :as => :purchasable
  ...
end

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