Rails渴望在所有发现中加载 [英] Rails Eager Loading on All Finds

问题描述

好的，我一直在处理一些急切的加载工作，并且有2种模型，例如：

OK, I've been playing around with some of the eager loading things, and have 2 models something like:

Class Recipe < ActiveRecord::Base
    belongs_to :cookbook
    has_many   :recipetags
end

和

Class Cookbook < ActiveRecord::Base
    has_many :recipes, :include => [:recipetags]
end

当我找到一本食谱时，效果很好然后我急于加载食谱，然后急于加载：recipetags：

Which is working out well, when I find a Cookbook, then I eager load the recipes, and in turn the recipes eager load the :recipetags:

cb = Cookbook.find(10590, :include => [:recipes])

但是我想做的就是每次我打开食谱，让它自动加入所有渴望的关联-基本上我想做：

But what I want to also do is whenever I open a recipe, have it pull in all of it's eager associations automatically - basically I want to do:

rec = Recipe.find(123)

，并且在这种情况下也希望加载：recipetags。

and have it eager load the :recipetags in that case as well.

我意识到这似乎是微不足道的，但是实际上我在Recipe上有大约4-5个关联，我只是不在这里显示它们，而不必显式地在每个上执行：include找到电话，我希望它能发生。我假设我可以重写Recipe.find以在Recipe模型中做到这一点，但想知道是否有更清洁的方法。...

I realize this seems trivial, but in actuality I have about 4-5 associations on Recipe, I'm just not showing them here, and rather than having to explicitly do the :include on every find call I'd like it to just happen. I'm assuming I can override Recipe.find to do it in the Recipe model, but was wondering if there was a cleaner way....

推荐答案

我一直在使用default_scope在希望始终加载的选定模型上执行此操作：

I've been using default_scope to do it on selected models where I always want to eager load:

class Post < ActiveRecord::Base
  has_many :comments
  default_scope :include => :comments, :order => ["title ASC"]
  ...
end

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