On 10-Jun-10, at 2:09 PM, Kieran Kelleher wrote:
On Jun 10, 2010, at 4:57 PM, Chuck Hill wrote:
On Jun 10, 2010, at 1:48 PM, Kieran Kelleher wrote:
(In reply to David's tweet - answer too long for twitter!.... and
twitlonger makes the sentences wrap too much....)
__________________________________________________________
David's question:
@kierankelleher would you mind showing me an example of how it is
used? It sounds like something that could be used with D2W for
permissions
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@daveeed
For example, in one of my apps, the User entity has a
"customersQualifier()" method that returns a qualifier
appropriate to the Role of the user that qualifies the user's
access to Customer objects in the system. The Qualifier is
constructed differently for customer users, inside sales,
sysadmin, graphic design, etc. The qualifier itself is based on
Customer attributes and in itself is useful only for fetches
against the Customer entity.
Now let's say I have Barcoded Coupons on Mailers, and someone is
scanning Coupon redemptions into a web form for tracking and
reporting of advertizement effectiveness and let's say I want to
make sure that the person scanning has access to the customer
that is related to those coupons. And in this scenario, let's say
the relationship keyPath from Coupon Entity to Customer Entity is
like this:
coupon -> mailer.campaign.program.location.customer
So when the coupon ID is scanned in and submitted, I can create a
Qualifier for the Coupon based on the ID, and then I need an
auxiliary security qualifier to ensure the logged in user has
access to the related Customer so I would do sth like these steps:
EOQualifier qCoupon = Coupon.XKEY_SERIAL_ID.eq( scannedCouponID );
EOQualifier qCustomer = currentUser.customerQualifier();
// Since qCustomer qualifies Customer entities and we want to
qualify the Coupon that we are fetching based on
// the user's restricted access to a specific set of Customer
EOs... prefix the customer qualifier to make it a coupon qualifier
// that restricts the fetch to coupons related to the customers
that this user has access to....
qCustomer = ERXPrefixQualifierTraversal.prefixQualifierWithKey
( "mailer.campaign.program.location.customer" );
qCustomer = ERXPrefixQualifierTraversal.prefixQualifierWithKey
(qCustomer, "mailer.campaign.program.location.customer" );
you mean?
Exactly :) This was typed into email - not Eclipse! Thnks for
spotting that Chuck. .... (BTW Chuck, you are missing out on the
"brief" Wo discussions on the Twitter Wo group)
Definitely missing out, Chuck. Just lurk, noone will notice :-)
d
EOQualifier qFinal = ERXQ.and( qCoupon, qCustomer );
Coupon c = ( fetch with qualifier 'qFinal' )
I hope that explains the usage of ERXPrefixQualifierTraversal
better ....
Regards, Kieran
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--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve
specific problems.
http://www.global-village.net/products/practical_webobjects
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