急于加载带有偏执狂默认作用域的已删除记录 [英] Eager loading of deleted records with paranoia's default scope

问题描述

我正在使用偏执狂 gem来软删除"记录.现在，我需要为关联的模型加载这些记录，其中一些记录可能已被删除.偏执狂将此default_scope添加到偏执狂"模型中:

I'm using the paranoia gem to "soft-delete" records. Now I need to eager load these records, some of which might have been deleted, for an associated model. Paranoia adds this default_scope to the "paranoid" model:

default_scope :conditions => { :deleted_at => nil }

实际上，我有以下(简化的)模型:

So in effect, I have these (simplified) models:

class Product
  has_many :orders
  default_scope :conditions => { :deleted_at => nil }
end

class Order
  belongs_to :product
end

我要实现的目标是在访问订单时急于加载产品:

What I'm trying to achieve is to eager-load the products when accessing orders:

Order.includes(:product)

这(来自如何在Rails3吗?)在这里不起作用:

This (from How to use unscoped on associated relations in Rails3?) does not work here:

Product.unscoped { Order.includes(:product) }

我知道我可以为 add 条件创建自定义的belongs_to关系(如

I know I could create a custom belongs_to relationship to add conditions (as in Eager loading nested association and scope), but I can't find a way to remove existing ones, if that's even possible.

问题:如何防止将默认范围应用于紧急加载查询?

Question: How do I prevent the default scope from being applied to the eager loading query?

推荐答案

好吧，事实证明，解决方法是在偏执"模型上强制加入联接，从而绕过default_scope:

Well, it turns out the workaround is to force a join on the "paranoid" model, which circumvents the default_scope:

Order.joins(:product).includes(:product)

不漂亮，但是可以.如果可能的话，希望有一个更好的答案.

Not pretty, but it works. Would like a better answer if possible.

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