feat: Include ORM associations in CollectionDecorator

[brunohkbx]

Description

Include all QueryMethods from the ORM in CollectionDecorator. The default strategy is :active_record

• Why was this change required?
  It was necessary to delegate or define a method of the ORM which you are using in your decorator to make an instance of CollectionDecorator able to call it.
• Is there something you aren't happy with or that needs extra attention?
  In order to support other ORM associations, we'll need to write a method allowed? for each strategy at lib/draper/query_methods/load_strategy.rb

Testing

1. Create a decorator for the model and its association

class OrderHistoryDecorator < Draper::Decorator
  delegate_all
end

class OrderDecorator < Draper::Decorator
  delegate_all

  decorates_association :order_histories, with: OrderHistoryDecorator
end

2. Call any query method in the decorated instance

pry(main)> Order.last.decorate.order_histories.includes(:user)

References

• Issue undefined method `includes' for #<Draper::CollectionDecorator:0x007fa8f21c0ed8> #702
• Issue Consider implement #preload in Draper::CollectionDecorator #812

[fladson]

this can't be on the before?

[brunohkbx]

I prefer to write the specs using the format: setup/exercise/verify.

[wenderjean]

Did you want to write allows customizing default_controller through configuration?

[wenderjean]

Or even, through Draper#configure, through configure method

[brunohkbx]

I'm not sure 🤔. I've just moved this old tests into a context, maybe these changes are out the scope of this pr?

[codebycliff]

Hey guys, this looks good. I left some feedback below. I'll probably continue to play around with it over the weekend, but I think you can expect it to be merged by the end of the weekend.

[brunohkbx]

Hey @codebycliff. Thanks for your feedback! 😃
I've already pushed all changes and improved a test.
Let me know if everything is ok.

[codebycliff]

Looks great! I have a couple applications running Draper master currently. I'll probably hold off on cutting a release to RubyGems for a week or two to make sure everything is good.