On 2014-02-28, 2:18 PM, "Ramsey Gurley" wrote:

EOF can handle it. Sure. But users can’t handle the Primary Key! [Jack 
Nicholson face] Expose it, and they’ll want to change it. Guaranteed.

That depends on how you use it.

Besides, just displaying it is no reason to expose it. You can display it just 
by using ERXGenericRecord’s primaryKey() method. You can fetch by PK too, 
ERXEOControlUtilites.objectWithPrimaryKeyValue or 
ERXEOGlobalIDUtils.fetchObjectsWithGlobalIDs. Plus, once you expose it, you 
have to populate it yourself. That is a headache all on its own.

No, you don’t have to populate it yourself.  EOF will still do it as long as 
you leave it null.

Chuck



On Feb 28, 2014, at 2:48 PM, Chuck Hill 
<ch...@global-village.net<mailto:ch...@global-village.net>> wrote:

Actually, exposing the PK is fine with EOF.  Exposing an FK is what causes real 
problems.


On 2014-02-28, 1:47 PM, "Aaron Rosenzweig" wrote:

Hi Ted,

If you must expose the primary key… make a duplicate attribute with a Read 
format and make it read only.

Look at page 41 of this document:
https://developer.apple.com/legacy/library/documentation/WebObjects/UsingEOModeler/UsingEOModeler.pdf

Exposing the PK as a class property could mess with the way EOF assigns the PK 
and it opens it up to possibly being modified.
Aaron Rosenzweig / Chat 'n Bike<http://www.chatnbike.com/>
e:  aa...@chatnbike.com<mailto:aa...@chatnbike.com>  t:  (301) 956-2319
[Chat 'n Bike]  [Chat 'n Bike]

On Feb 28, 2014, at 4:41 PM, Jesse Tayler 
<jtay...@oeinc.com<mailto:jtay...@oeinc.com>> wrote:

generate a unique ID, if you don’t mind using HEX….




On Feb 28, 2014, at 4:32 PM, Chuck Hill 
<ch...@global-village.net<mailto:ch...@global-village.net>> wrote:

Does it mean anything to the user?  I assume it does, otherwise, why would you 
show it?  So what is going to happen when they see this:
id number    description     client
     3456         Blue Dress     Amex
     3457         Blue Socks     Chuck
     3459         Blue Tie     Ted
     3460         Blue Blouse     Visa

Where is 3458?  Because that IS going to happen if you use the PK.

Chuck


On 2014-02-28, 1:25 PM, "Theodore Petrosky" wrote:

I need to create an Entity that will have a user visible id number. I thought I 
would just use the primaryKey but I recall reading so many times don't use the 
primaryKey for this.

This is a very simple Entity. It has a description, a Client, and a boolean 
(isActive). When the user views a list of these Entities, he/she will see:

id number    description     client
     3456         Blue Dress     Amex

when I insert a new Entity, I only need to supply the description and Client 
(from a popup). WO will supply the ID number. So why not use the primaryKey 
here? The user can never edit it. and none of these Entities will ever be 
deleted.
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