Em 27-04-2012 13:55, Jeremy Evans escreveu:
On Friday, April 27, 2012 9:34:29 AM UTC-7, Rodrigo Rosenfeld Rosas
wrote:
Em 27-04-2012 13:19, Jeremy Evans escreveu:
On Friday, April 27, 2012 5:31:16 AM UTC-7, Rodrigo Rosenfeld
Rosas wrote:
Em 26-04-2012 22:16, Jeremy Evans escreveu:
3) There is already a Dataset#as method that does something
different, and many Model class methods call the dataset
method of the same, so adding a Model.as method that returns
a modified dataset would introduce an apparent inconsistency.
Sorry I couldn't understand this. If you don't mind, an
example might help here.
Many model class methods just call the dataset method with the
same name. For example, you can do:
Model.where(...)
instead of:
Model.dataset.where(...)
But since Model.dataset.as <http://Model.dataset.as> already
exists and operates differently than your proposed usage
(returning an Sequel::SQL::AliasedExpression), Model.as would
appear inconsistent in this regard.
Humm... what does it do? Believe me, I tried to look for "as" in
the Dataset documentation but couldn't find it:
http://sequel.rubyforge.org/rdoc/classes/Sequel/Dataset.html
<http://sequel.rubyforge.org/rdoc/classes/Sequel/Dataset.html>
What is this useful for?
I could only find this:
http://sequel.rubyforge.org/rdoc/classes/Sequel/SQL/AliasMethods.html
<http://sequel.rubyforge.org/rdoc/classes/Sequel/SQL/AliasMethods.html>
But its documentation suggests a different usage than
Model.dataset.as <http://Model.dataset.as>().
AliasMethods is listed under Included Modules on the Dataset RDoc page.
Among other things, it allows you do to stuff like:
DB[:albums].join(DB[:artists].where(:name.like('A%')).as(:a),
:id=>:artist_id)
Joining to a subselect and using an alias for the join.
Humm... makes sense. Smart :)
Thanks again :)
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