Rails: select unique values from a column

Question

I already have a working solution, but I would really like to know why this doesn\'t work:

ratings = Model.select(:rating).uniq
ratings.each { |r| puts r.rat         


        

Answer 1

You can use the following Gem: active_record_distinct_on

Model.distinct_on(:rating)

Yields the following query:

SELECT DISTINCT ON ( "models"."rating" ) "models".* FROM "models"