Broken implicit sorting by join tables in v1.2.3

[sasha-id]

This change in version 1.2.3 breaks implicit sorting by join tables aka join_table.column.
I guess the change was made to avoid SQL injections, but simple regex filter will work as well.

smart_listing/lib/smart_listing.rb

key = attr.to_s if @options[:array] || @collection.klass.attribute_method?(attr)

[korun]

Hi!
Then this regex should include all of database-specific identifier's quotes (like " for postgresql and others, backticks for some mysql, etc) and optional schema name?
For quick fix you can clearly specify sorting fields on smart_listing_create:

  sort_attributes: [
    [:column, 'join_table.column']
  ],