Allow creating aliases for ransack attributes

[rzane]

Ransack is great, but the query strings can get crazy pretty quickly, especially when querying associations. It would be really great to have aliases for ransack attributes.

It seems like people want this feature built into Ransack. See:

• Make alias to attributes #39
• Short alias for long compound search field #253
• Create aliases for (long) search fields #536
• https://github.com/jhdavids8/ransack-abbreviator

This PR allows you to do this:

class Author < ActiveRecord::Base
  # Columns: (first_name, last_name)
end

class Post < ActiveRecord::Base
  # Columns: (title, author_id)
  belongs_to :author
  ransack_alias :name, :title
  ransack_alias :author, :author_first_name_or_author_last_name
end

puts Post.ransack(name_start: 'Fun').result.to_sql
puts Post.ransack(author_cont: 'Ray').result.to_sql

SELECT "posts".* FROM "posts"
WHERE ("posts"."title" LIKE 'Fun%')

SELECT "posts".* FROM "posts"
LEFT OUTER JOIN "authors" ON "authors"."id" = "posts"."author_id"
WHERE ("authors"."first_name" LIKE '%Ray%' OR "authors"."last_name" LIKE '%Ray%')

[jonatack]

Looks like a typo here. It did not cause the specs to fail?

[rzane]

Definitely a typo, but that variable is always being accessed through it's reader, which is why the tests pass anyway.

[jonatack]

Oh right, memoization. Thanks.

[jonatack]

Thanks for the PR! Will test it locally soon.

[rzane]

Hey @jonatack, I fixed that typo. Have you had a chance to take a look?

[jonatack]

LGTM, thanks @rzane. Could you update the README and Change Log to document this change?

[rzane]

Sure. I'll do that right now.

[jonatack]

Great.

[lauramosher]

I have been excited for this change since I spotted it a month ago. Do you have an ETA for when this will be released?

[jonatack]

Hi @lauramosher, you can use all the latest features with the master branch.

We do need to do a release soon but there are a couple of issues to iron out before...

[lauramosher]

@jonatack Thank you for the reply! Unfortunately, I am unable to use the master branch in this instance, but greatly look forward to the release. Keep up the awesome work.

[laserlemon]

Looks great! Anything I can do to help move this into a release? Thank you! 👏