LIMIT clauses accumulate, anger PostgreSQL
Reported by Matthew King | 2007-08-30 18:26:57 UTC
Each time you kick a first or [] off of a query using a limit or offset, it accumulates a LimitProcessor in keyed_clauses[:limit].
Additionally, PostgreSQL does not support the LIMIT #,# syntax for specifying a limit and offset concisely.
Comments and changes to this ticket
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Matthew King 2007-08-30 18:30:11 UTC
Attached is a patch with a test that demonstrates the accumulation problem. Easy to reproduce: just run Query#first with an argument more than once on the same query.
I think that LIMIT and OFFSET ought to be one-time additions to the query, so we don't store them in @clauses. I'm playing with a fix that adds them as args to Query#to_hash and Query#to_s. Will upload patch soon.
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Matthew King 2007-08-30 18:35:07 UTC
Here is a patch (with tests!) that substantially changes the way Ambition::Limit works.
It solves the PostgreSQL problem by breaking out limit and offset into separate SQL clauses. This is much better for readability, by the way. Figuring out what was going on with the reversed-argument calls to first from [] really hurt my head. Tests are much clearer, too.
It solves the accumulating clauses problem by making the limit and offset values into args for the kicker method
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Matthew King 2007-08-30 18:38:39 UTC
- Title changed from “LIMIT clauses accumulate, anger PostgreSQL unbearably” to “LIMIT clauses accumulate, anger PostgreSQL”
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Chris Wanstrath 2007-09-01 15:21:11 UTC
- State changed from “new” to “open”
Looking at this now, just wanted to say that it's a bug that #first(3) is a kicker. Definitely should not be. So this patch is built upon my bug, but I'll mess around with it.
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Chris Wanstrath 2007-09-02 02:52:09 UTC
- State changed from “open” to “resolved”
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Chris Wanstrath
Matthew King