Re: ERXPrefixQualifierTraversal usage example (@daveeed)
Re: ERXPrefixQualifierTraversal usage example (@daveeed)
- Subject: Re: ERXPrefixQualifierTraversal usage example (@daveeed)
- From: Chuck Hill <email@hidden>
- Date: Thu, 10 Jun 2010 14:21:25 -0700
On Jun 10, 2010, 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
__________________________________________________________
@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)
The real cool kids don't twitter.
:-P
Chuck
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
--
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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