Add new helper API

[reeganviljoen]

closes #1848

What are you trying to accomplish?

as discussed I am attempting to add a more explicit helpers api to replace helper.<helper>

What approach did you choose and why?

I used a active support concern to add the method to make it modular and optional

Anything you want to highlight for special attention from reviewers?

[reeganviljoen]

@camertron I haven't added the test helpers discussed yet, but can you take a look at what is added so far

[camertron]

This is looking good, thanks @reeganviljoen! Could I ask you to take a look at my comments and write some docs as well?

[Spone]

Thanks for this @reeganviljoen! Let us know if you need help with the docs!

[reeganviljoen]

@camertron, @Spone I got the use_helpers helper top work finally after many hours of debugging strange errors, however I believe it can be further refactored quite a bit but due to these errors whenever I try it breaks, if you can possibly help(if you can) it would be much appreciated

[BlakeWilliams]

Looking good! I had a few suggestions/thoughts but I like where this is going!

[BlakeWilliams]

I was imagining that this could be used to mock helpers instead of including helpers that should already be present on the view context.

e.g.

test "foo" do
  # delegates to the current_user method
  with_helpers(current_user: :current_user) do
    render_inline MyComponent.new
  end

  current_user = create(:user)
  # stubs the current_user helper to return this value
  with_helpers(current_user: current_user) do
    render_inline MyComponent.new
  end
end

def current_user
  # some logic
end

[reeganviljoen]

@BlakeWilliams moving this to a new pr

[reeganviljoen]

@Spone, @BlakeWilliams , @camertron I have decided to separate the test_helper portion of this pull request as their seems to be a few unrelated issues that would benefit from focused attention, would any of you be able to review what is left of the use_helpers method, I will be adding docs soon

[Spone]

@Spone, @BlakeWilliams , @camertron I have decided to separate the test_helper portion of this pull request

Good call, let's focus on the core feature, then add the test helper.

[camertron]

Awesome, I think this is ready to go!