sql joins order by isn't including the table name, causes ambiguous column error when using select or pluck

[sr75]

When you join tables the ranked model doesn't include table alias in the order by so you get error:

Column 'row_order' in order clause is ambiguous

You only get this bug when attempting to access columns from result using pluck or select etc...

model.rb
include RankedModel
ranks :track_order, column: :row_order

## scopes ##
default_scope rank(:track_order)

Cause sql gen'd for:

Track.joins(:videos).where(videos: {fan_id: fan_id, workflow_state: [:submitted, :pending, :approved]}).pluck(:id)

SELECT `tracks`.`id` FROM `tracks` INNER JOIN `videos` ON `videos`.`track_id` = `tracks`.`id` WHERE `videos`.`fan_id` = ? AND `videos`.`workflow_state` IN ('submitted', 'pending', 'approved') ORDER BY row_order

Was able to override by doing this on include:

# model.rb
include RankedModel
ranks :track_order, column: 'tracks.row_order'

## scopes ##
default_scope rank(:track_order)

The above change generates sql correctly:

SELECT `tracks`.`id` FROM `tracks` INNER JOIN `videos` ON `videos`.`track_id` = `tracks`.`id` WHERE `videos`.`fan_id` = ? AND `videos`.`workflow_state` IN ('submitted', 'pending', 'approved') ORDER BY tracks.row_order

Gem should probably always alias order by clauses just to be safe of possible ambiguous column errors.