Re: [Rails] Using :group with #count generating bad SQL in Postgres

Your query is wrong...
You need group all columns you show that arent the result of an aggregate function...
So your group would be group('titles.*')

Em 22/07/2013 18:22, "yaw" <yawboakye10@gmail.com> escreveu:

Rails 4.0.0, Ruby 2.0

class Title < ...
  ...

  has_many :comments

  def self.order_by_number_of_comments_descending
    select('titles.*, count(comments.id) AS comments_count').
    joins(:comments).
    group('titles.id').
    order('comment_count DESC')
  end

results in a malformed SQL on Postgres,


SELECT COUNT(*) AS count_all, titles.id AS titles_id FROM "titles"
INNER JOIN "comments" ON "comments"."title_id" = "titles"."id" GROUP BY titles.id ORDER BY comments_count DESC

I've contacted @steveklabnik and he'd re-open an issue reporting this bug. In the meantime, has anybody got around this? The SQL is all correct until you call group.
Thanks for helping

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