-----Original Message----- From: Tony.McDonald@newcastle.ac.uk [mailto:Tony.McDonald@newcastle.ac.uk] Sent: Monday, June 07, 1999 3:54 PM To: dmd@3e.org Cc: zope@zope.org Subject: Re: [Zope] another simple question...
The zope manual would be much more useful if it gave a few
examples...
I have this method:
Method: GetAuthorID Arguments: authorid:int
SELECT authorname,authoremail FROM authors WHERE <!--#sqltest authorid column=authorid type=int-->
I then want to do something like this:
<!--#in GetAuthorID(4)--> <A HREF="mailto:<!--#var authoremail-->"><!--#var authorname--></A> <!--#/in-->
What's the proper format for calling a method with arguments?
<!--#in "GetAuthor(authorid=4)"--> blah blah <!--#/in-->
I believe this is because 'GetAuthorID(4)' is actually an expression and therefore needs quoting. As for setting the ZSQL argument, that's because I've never managed to get a ZSQL method that needed an argumanet to work without it...
There is another side effect of using name lookup vs. expressions. If you just look a method up by name (assuming no arguments) like <!--#var blah--> and that method returns a sequence, the name 'blah' is actually turned *into* a sequence from a method. If you said: <!--#var blah--> <!--#var "blah()"--> You would get an error that 'blah' has no __call__ method, because it was turned into a sequence by being called by name. This is a feature, so that expensive methods can be cached. If you don't want this method cached (say it has some sort of side effect that changes itself, or is based on time, or some other craziness) then allways use quotes around it, and a) it won't be chached and b) it won't be transmutated into a sequence. Obviously, if your method requires arguments, 99% of the time your not going to want the cache the results, so calling methods with arguments requires using the expression machinery. The rule of thumb is, be consistent. Mixing and matching expressions and name lookup on the same method can run you into cache clash. -Michel
hth toe (dumb telnet session..)
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