That worked. I find it a little surprising that this is the correct way to
do this, but it worked, so I am happy. Thank you.
On Thursday, February 21, 2013 1:43:18 PM UTC-5, Sean Corfield wrote:
>
> I tend to have this at the top of most of my namespaces:
>
> (def ^:private my-ns *ns*)
>
> This evaluates *ns* at load/init time when it is bound to the
> namespace being loaded and then initializes my-ns with that value.
> Then I use my-ns throughout that namespace.
>
> *ns* is dynamically bound to whatever namespace is currently executing
> which is why it changes "unexpectedly" when you're trying to do
> something obvious with it.
>
> On Thu, Feb 21, 2013 at 10:30 AM, larry google groups
> <lawrenc...@gmail.com <javascript:>> wrote:
> > I wanted to have some functions run when an app starts, and I wanted
> this to
> > be configurable, because I plan to use the same architecture for several
> > apps. So I thought I could have the function names as strings inside of
> maps
> > inside of a set (that I sort), in a config file. And I thought I could
> use
> > ns-resolve *ns* symbol to turn the strings into references to the vars
> where
> > the function definitions are stored. But somehow this is not working. I
> have
> > this right now, in mpdv.core, which is the core namespace is an app I
> > created with lein:
> >
> >
> > (defn process-startup-hooks []
> > "2013-02-21- remember, each row in hooks is a map: {:order-of-events
> 1,
> > :event-name 'connect-to-database'}"
> > (connect-to-database)
> > (let [hooks (sort-by :order-of-events
> > (:events-called-when-the-app-starts-hooks @um/interactions))]
> > (doseq [x hooks]
> > (let [event-as-symbol (symbol (:event-name x))
> > event (ns-resolve *ns* event-as-symbol)]
> > (println " what kind of var is this? ")
> > (println *ns*)
> > (println (type event-as-symbol))
> > (println event-as-symbol)
> > (if-not (nil? event)
> > (event))))))
> >
> >
> > "event" is always nil. One of the events listed in um/interactions is
> > "connect-to-database" so, as a test, I hardcoded it here, to be sure it
> > could run here, and it runs fine (first line after the comment). So the
> var
> > for the function is known. But this:
> >
> > (ns-resolve *ns* event-as-symbol)
> >
> > returns nil, even when event-as-symbol is "connect-to-database".
> >
> > When I println *ns* to the terminal output, I see the namespace is:
> >
> > #<Namespace clojure.core>
> >
> > Which surprises me somewhat.
> >
> > How do I get ns-resolve to look in mpdv.core for the var that I want it
> to
> > find?
> >
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>
>
> --
> Sean A Corfield -- (904) 302-SEAN
> An Architect's View -- http://corfield.org/
> World Singles, LLC. -- http://worldsingles.com/
>
> "Perfection is the enemy of the good."
> -- Gustave Flaubert, French realist novelist (1821-1880)
>
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