Hey

I'm working on a Rails-3.0.10 project where I suggested using Sequel as
the ORM, but sadly we're using ActiveRecord (with arel 2.0.10).

I've been using Sequel for quite a while now, so I kinda think in
Sequel. Maybe it's just because I don't know ActiveRecord and arel well
enough, but I keep on finding myself jumping through hoops to do things
that I assume ought to be simple.

Like distinct, for example. There doesn't seem to be a good way of
doing it in arel other than using a string 'distinct(fieldname)' which
is fine unless you don't know ahead of time whether fieldname needs to
be qualified by a table name. Not really a huge issue, but still.

As for documentation, the first result in a google search for "arel
documentation" returns a link to StackOverflow:

  ruby on rails 3 - Where can I find good AREL documentation

Basically, there isn't any.

So it took quite a while to figure out why the project method didn't
work, and then figure out how to monkey-patch arel to do the equivalent
of Dataset#select. By default arel's project does the equivalent of
Dataset#select_more.

And don't get me started on the whole

  ModelClass.scoped.table[:field_name] thing.

Well, OK. More of a rant than an anecdote then.

bye
John

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