Add :compose option to has_many

[Bahanix]

Summary

Generates additionnal has_many for each given association scope.

# Before
has_many :posts
has_many :published_posts, -> { published }, class_name: "Post"

# After
has_many :posts, compose: :published

Other Information

In my rails projects, I write a lot of has_many variations to be able to use fine-grained preload. Eg: Author.all.preload(:published_post)…. So I wrote this feature to have syntaxic sugar to shorten all theses has_many.

Here is an unpublished post I wrote about this feature:

https://medium.com/octoly-tech/activerecord-has-many-compose-option-4f2cbdb524a3

Perhaps a better name for this option may be preloadable_scopes—it does not cover all things one can do with this feature, but it is a quite self-explained option name since preloading theses generated has_many would be (I think) its main usage. I am not a native english and this is my first contribution, do not hesitate suggesting other option names.

[rails-bot]

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