DevForce Community Forum : Verification for FK Key property http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce 2010 : Verification for FK Key property Mon, 13 Apr 2026 02:31:46 -700 Tue, 17 Jan 2012 16:54:16 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=3216 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ Verification for FK Key property : Hi katit,I'd say that this... http://www.ideablade.com/forum/forum_posts.asp?TID=3216&PID=12475#12475 Author: DenisK
Subject: 3216
Posted: 17-Jan-2012 at 4:54pm

Hi katit,

I'd say that this depends on your business context. If the integer 0 will never be allowed as an id, then option 2 is okay. If 0 is a valid id number, then I'd implement a default negative value.

Another option is to implement your own null entity. Please see below links for more info.

http://drc.ideablade.com/xwiki/bin/view/Documentation/null-entity
http://drc.ideablade.com/xwiki/bin/view/Documentation/model-nullentity
]]> Tue, 17 Jan 2012 16:54:16 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3216&PID=12475#12475 Verification for FK Key property : I have Customer object and... http://www.ideablade.com/forum/forum_posts.asp?TID=3216&PID=12467#12467 Author: katit
Subject: 3216
Posted: 13-Jan-2012 at 1:35pm

I have Customer object and it's got TimeZoneKey property which is FK
 
When I bind TimeZone on customer screen - it looks like this:
 

<

ComboBox ItemsSource="{Binding TimeZones}" SelectedValue="{Binding CurrentItem.TimeZoneKey, Mode=TwoWay}" Grid.Column="1" Grid.Row="5" Margin="1" SelectedValuePath="TimeZoneKey" DisplayMemberPath="DisplayName" TabIndex="5">

</ComboBox>

 

Where I have issue is that verifier doesn't work. RequiredValueValidator is there, but problem is that if TimeZone not selected from dropdown - Key stays "0", not null and it's fine by verifier.
 
Just looking for best way to handle such scenario.
 
1. Default time zone to something?
2. Add another verifier and check to make sure Key>0 ?
3. Somehow stop Key default to 0?
]]> Fri, 13 Jan 2012 13:35:16 -700 http://www.ideablade.com/forum/forum_posts.asp?TID=3216&PID=12467#12467