I've made a few changes to Postmodern. They both try to do a little magic in the case where a table has a single primary key column. The first change allows you to use a DAO-OBJECT directly as a parameter, rather than pulling out the key field. EG:
(select-dao 'foo (:= 'bar bar))
instead of having to do
(select-dao 'foo (:= 'bar (id bar)))
And the second allows the use of a DAO-CLASS name in the :COL-TYPE field of a slot definition. EG:
(defclass bar () ((id :col-type serial)) (:metaclass dao-class)) (defclass foo () ((bar :col-type (or db-null bar))) (:metaclass dao-class))
instead of
(defclass bar () ((id :col-type serial)) (:metaclass dao-class))
(defclass foo () ((bar :col-type (or db-null integer))) (:metaclass dao-class))
These both seem pretty basic, but they mean that you can change the primary key column name or type without having to make changes throughout your code. Also, I see it as a first step toward being able to (eagerly or lazily) auto-populate slots with full objects rather than keys.
Does this seem useful, too magical, or already there but I missed it?
Hello Greg,
I'm hesitant to incorporate any 'magic' like this into the core library. It's a matter of aesthetics, but I'm no big fan of this kind of do-what-I-mean API style. I prefer explicitness. If you want to work on a library that does a lot of helpful things under the covers, I think that's best tackled as a layer on top of Postmodern, so that people who want a different approach, or just the basics, don't have to deal with it.
Best, Marijn
On Wed, May 9, 2012 at 7:27 PM, Greg Pfeil greg@technomadic.org wrote:
I've made a few changes to Postmodern. They both try to do a little magic in the case where a table has a single primary key column. The first change allows you to use a DAO-OBJECT directly as a parameter, rather than pulling out the key field. EG:
(select-dao 'foo (:= 'bar bar))
instead of having to do
(select-dao 'foo (:= 'bar (id bar)))
And the second allows the use of a DAO-CLASS name in the :COL-TYPE field of a slot definition. EG:
(defclass bar () ((id :col-type serial)) (:metaclass dao-class)) (defclass foo () ((bar :col-type (or db-null bar))) (:metaclass dao-class))
instead of
(defclass bar () ((id :col-type serial)) (:metaclass dao-class))
(defclass foo () ((bar :col-type (or db-null integer))) (:metaclass dao-class))
These both seem pretty basic, but they mean that you can change the primary key column name or type without having to make changes throughout your code. Also, I see it as a first step toward being able to (eagerly or lazily) auto-populate slots with full objects rather than keys.
Does this seem useful, too magical, or already there but I missed it?
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Marijn Haverbeke