Sorry...
Are there more columns on titles entity? If yes... the problem is that you
tried to show columns you weren't grouping... and on postgresql it blows an
exception... but if there is only one column on titles... (titles.id) so, I
can't figure out what's the problem you mentioned...
What were your expected SQL to say that the result were malformed?
Atenciosamente,
*Carlos Figueiredo*
On Tue, Jul 23, 2013 at 4:11 PM, Carlos Figueiredo <
carlos.figueired...@gmail.com> wrote:
>
>
> def self.order_by_number_of_comments_descending
> select('titles.id, titles.name, titles.whatever, count(comments.id)
> AS comments_count').
> joins(:comments).
> group('titles.id, titles.name, titles.whatever').
>
> order('comment_count DESC')
> end
>
> Assuming titles model is like (id, name, whatever)
>
> The result query expected is:
> SELECT COUNT(*) AS comments_count, titles.id AS titles_id, titles.name as
> titles_name, titles.whatever as titles_whatever FROM "titles"
> INNER JOIN "comments" ON "comments"."title_id" = "titles"."id" GROUP BY
> titles.id,
> titles.name, titles.whatever <http://titles.id> ORDER BY comments_count
> DESC
>
> Atenciosamente,
>
> *Carlos Figueiredo*
>
>
> On Tue, Jul 23, 2013 at 1:48 PM, Yaw Boakye elGran
> <yawboaky...@gmail.com>wrote:
>
>> Can you write the right (no pun intended) query here? Thanks
>>
>>
>> On Tue, Jul 23, 2013 at 12:36 PM, Carlos Figueiredo <
>> carlos.figueired...@gmail.com> wrote:
>>
>>> 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" <yawboaky...@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. <https://github.com/rails/rails/issues/5588> In the meantime, has
>>>> anybody got around this? The SQL is all correct until you call group.
>>>> Thanks for helping
>>>>
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