Re: Core Data: Dual-Inverse Relation Possible in Modeler?
Re: Core Data: Dual-Inverse Relation Possible in Modeler?
- Subject: Re: Core Data: Dual-Inverse Relation Possible in Modeler?
- From: email@hidden
- Date: Thu, 20 Oct 2005 23:01:27 -0700
At 19:17, mmalcolm crawford wrote:
On Oct 20, 2005, at 7:10 PM, email@hidden wrote:
As an example, there are a bunch of fighters, they have a to-many
relation called "Enemies,"
so when say Nightman adds Batman as one of his enemies, Batman
also adds Nightman as one
of his enemies, and when either Batman or Nightman takes the other
off the list, then the other also reciprocates. Is this possible
to set in the modeler, or would I need to just add some custom
code in my Managed object?
Core Data does this automatically.
<http://developer.apple.com/documentation/Cocoa/Conceptual/CoreData/
Articles/cdLifecycleManagement.html#//apple_ref/doc/uid/
TP40001652-207874-TPXREF149>
mmalc
Yea, I read that, and while if I add Nightman to Batmans' list of
enemies, Batman is not listed in Nightmans' automatically because
thier "enemies" to-many relation are the same name, thats what I
meant by a Dual-Inverse, where the inverse relation is to the same
relation of the same entity. IOW, not like the previous example where
an employee gets a "manager" and then the "directReports" adds the
employee,
this works automatically as inverse because they are different
relationship names even though the same entity, but if they were the
same name,
I think it can only be done in code if the relations are the same
name and same entity.
In otherwords this cant be done in the modeler GUI:
Entity:Attacker Entity:Attacker
Name:Batman Name:Nightman
Relation:Enemies <<-->>Relation:Enemies (To-Many Inverse to itself)
What I'm really concerned is if its a bad design...
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