The class-to-table mappings are nice and easy - the harder part (IMO) of
the problem is maintaining type-safety for the 'group' types. These
should, I think, have a signature along the lines of
class AnimalGroup<T> where T:Animal
class AnimalGroupMember<T> where T:Animal
T AnimalMember { get; set; }
to prevent cats & dogs being accidentally mixed together with the
resultant flying fur^H^H^H exceptions. As above with single-ended
assocations is not a problem - but if you wire things bidirectionally
then suddenly it gets a lot harder:
class AnimalGroupMember<T> where T:Animal
T Member { get; set; }
AnimalGroup<T> Group { get; set; }
class Animal
ICollection<AnimalGroupMember<? what goes here ?>> GroupMemberShips
I've yet to find a 'clean' solution for this that I'm 100% happy with
... all of my attempts have resulted in either class-bloat, casts or
a-priori knowledge of concrete Animal types.
/Pete
From: [email protected] [mailto:[email protected]] On
Behalf Of Fran Knebels
Sent: 13 March 2013 16:12
To: [email protected]
Subject: Re: [nhusers] Mapping property of BaseClass type
another good blog entry for loquacious mapping.
On Wednesday, March 13, 2013, Roger Kratz wrote:
http://nhforge.org/doc/nh/en/index.html#inheritance-tableperconcrete
From: [email protected]
<javascript:_e(%7b%7d,%20'cvml',%20'[email protected]');>
[mailto:[email protected]
<javascript:_e(%7b%7d,%20'cvml',%20'[email protected]');> ] On
Behalf Of mouthbow
Sent: den 13 mars 2013 16:28
To: [email protected]
<javascript:_e(%7b%7d,%20'cvml',%20'[email protected]');>
Subject: [nhusers] Mapping property of BaseClass type
Hi, I'm trying to make this mapping and I think it must be simple but
I'm not getting the way.
Suppose in one side I have three clases:
-Animal
-Dog : Animal
-Cat : Animal
public abstract class Animal {
public Guid Id { get; set; }
public String Name { get; set; }
}
public class Dog : Animal
{
public datetime WalkHour {get; set;}
}
public class Cat : Animal
{
public int MeaowCount {get; set;}
}
And in the other side I have other two classes:
-AnimalGroup
-AnimalGroupMember
public class AnimalGroup
{
public Guid Id { get; set; }
public String Name { get; set; }
}
public class AnimalGroupMember
{
public Guid Id {get; set;}
public Animal AnimalMember {get; set;}
}
As you can see, what I want is that my AnimalGroupMembers can be any
kind of Animal but I want to get the correct type of Animal in the
property AnimalMember (obviously casting to its type). I also need to
keep separately in Database: one table for Cats and one Table for Dogs
and I don't want to have any table called Animal.
Please help me in doing this, I really need this solution.
Thanks for reading and for helping.<
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