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default_scope behavior causes the generated SQL to be invalid for PostgreSQL
Reported by Mert Torun | October 18th, 2010 @ 03:34 PM
When I have something like
class Model < ActiveRecord::Base
default_scope order(:ordering_column)
end
and I call
@counts = Model.group(:grouping_column).count
in the controller(or elsewhere), ActiveRecord still appends
ORDER BY 'ordering_column' to the generated SQL. This
causes no problems in SQLite (probably ignored) but raises an
Invalid SQL error with PostgreSQL, saying that the ordering column
isn't in the query.
Either the PostgreSQL adapter or Arel should probably discard
the unnecessary ORDER_BY statement for this to behave
nicely.
Comments and changes to this ticket
-
Andrew White October 18th, 2010 @ 04:10 PM
- Importance changed from “” to “Low”
Is there any situation where an ORDER BY statement is useful in a COUNT query - I can't think of one. Perhaps AR::Relation should drop the order clause on all count queries?
As a workaround you can use except to remove the order clause:
@counts = Model.except(:order).group(:grouping_column).count -
Santiago Pastorino February 2nd, 2011 @ 04:29 PM
- State changed from “new” to “open”
This issue has been automatically marked as stale because it has not been commented on for at least three months.
The resources of the Rails core team are limited, and so we are asking for your help. If you can still reproduce this error on the 3-0-stable branch or on master, please reply with all of the information you have about it and add "[state:open]" to your comment. This will reopen the ticket for review. Likewise, if you feel that this is a very important feature for Rails to include, please reply with your explanation so we can consider it.
Thank you for all your contributions, and we hope you will understand this step to focus our efforts where they are most helpful.
-
Santiago Pastorino February 2nd, 2011 @ 04:29 PM
- State changed from “open” to “stale”
-
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Andrew White
Jason King
Jeremy Kemper
Mert Torun