Re: How to Retrieve Session User?
Re: How to Retrieve Session User?
- Subject: Re: How to Retrieve Session User?
- From: Mark Morris <email@hidden>
- Date: Wed, 4 Apr 2007 17:58:14 -0500
Hi Fred,
KVC is certainly an integral part of WO, but much of that is a bit
behind the scenes. For instance, if you create the user() and setUser
() methods in your Session class, WO's KVC implementation is what
lets you bind session.user to a WOString in a component. So you get
the advantages, while still getting the benefits of proper methods
that Mike was mentioning (such as some compiler error checking,
easier maintainability/internal documentation, and the ability to put
some logic in the accessor methods).
Regards,
Mark
On Apr 4, 2007, at 5:22 PM, Fred Shurtleff wrote:
Chuck,
I would welcome your comments on my KVC usage.
I was actually surprised by Mike's statement re: KVC
'funnybusiness' as I was led to believe from my readings that KVC
was a very integral part of WO. And the KVC concept seems very
straight-forward to me - what can be simpler than takeValueForKey
( value, key)? Also this is the technique I have learned from a
number of tutorials.
But then I am unable to put/get a user into the session - so there
must be something I am missing. Actually I have tried so many ways
to retrieve the user, I now think I never got the user into the
session to begin with. :-)
Chuck Hill wrote:
Listen to Mike. I was just about to write and make the same
complaint of your code. Abusing KVC is NOT your friend.
Chuck
On Apr 4, 2007, at 1:45 PM, Mike Schrag wrote:
PERSONALLY, I'd stop all this KVC funnybusiness. It has its
place and it's really powerful, but you're making your life way
obnoxious. Let Java do its job and just call methods on things
-- there are LOTS of benefits of this. Define a proper user
field on your Session class and do setUser(..) and user() to
retrieve it.
On Apr 4, 2007, at 4:40 PM, Fred Shurtleff wrote:
Mark - I understand where you are coming from, and did try your
suggestion. But I still am NOT getting a user EO instance (I get
null per the debugger).
Actually I checked the WO docs and both valueForKeyPath AND
valueForKey are valid methods of the Session class. Problem is
what is the correct syntax. The docs say object.valueForKey
(string), and your suggestion provided the object part (ie
session()) (I also tried your input + valueForKeyPath but
Eclipse complained about 'no such key = session')
So I still am at a loss on how to retrieve a user EO from the
session. :-(
But thanks for your help/input!
Mark Morris wrote:
Hi Fred,
On Apr 4, 2007, at 3:10 PM, Fred Shurtleff wrote:
Hello,
I have a basic question on how to access the logged in user
for later use in updates. After authenticating a user I enter
him into the session, but when I later try to retrieve this
user in another page, it fails(returns null).
So in my main page I record the user as follows:
if (_password.equals(password))
{ EOEnterpriseObject user =
EOUtilities.objectMatchingKeyAndValue(session
().defaultEditingContext(), "User", "name", username);
// set the
session.user session
().takeValueForKey(user, "user");
And on another page to add a new transaction which needs the
user relation attribute(as a foreign key):
EOEnterpriseObject user = (EOEnterpriseObject) valueForKeyPath
("session.user"); // user evals to null???
Try changing this to:
EOEnterpriseObject user = (EOEnterpriseObject)session
().valueForKey("user");
valueForKeyPath is useful, but I don't think it can do what
you're asking of it here.
purchase.addObjectToBothSidesOfRelationshipWithKey(user, "user");
The save fails because user is a required attribute. And I'm
not sure if I am not properly storing the user in the session,
or not properly retrieving the user from the session.
Can anyone see what I am doing wrong or suggest another approach?
TIA
Personally, I usually make currentUser an actual variable in
Session. (Private, with public accessor methods, of course! ;-)
Regards,
Mark
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