Consider ransack aliases when sorting

[faragorn]

ransack_alias is a great feature however it does not work with sorting out of the box. In my opinion ransack_aliases should be recognized by sort function out of the box.

Consider the following example:

class Post < ActiveRecord::Base
  belongs_to :author

  # Abbreviate :author_first_name_or_author_last_name to :author
  ransack_alias :author, :author_last_name
end

In your view:

  <%= sort_link(@q, :author, 'Author Name') %>

[scarroll32]

Hi @faragorn this looks good and should merge now we not supporting Ruby 2. Could you write some tests to cover this before it is merged?

[ekampp]

Hey, @seanfcarroll, I need this feature, so if you could help me understand, where I should start attempting to add test coverage, I will open a new PR with this code and test coverage. Thanks.

[deivid-rodriguez]

Closing as this was fixed by #1223.

@faragorn Unfortunately you were not credited as commit author even if you are the original author of this solution, I will add your name to the changelog though! Thanks!