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Custom Association with multiple criteria
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Vonzkie View Drop Down
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Posts: 133 		Post Options Post Options   Quote Vonzkie Quote  Post ReplyReply Direct Link To This Post Topic: Custom Association with multiple criteria
    Posted: 19-Apr-2012 at 2:44am
Hi,

How can I create a custom association in Devforce that have multiple criteria?

E.g: 

Customer
CustomerID
Name
LocationID

Invoice
InvoiceID
CustomerID
Description
InvoiceLocationID

I want to have a one to many relationship with Customer and Invoice but the criteria would be:

Customer  Invoice
CustomerID =  CustomerID
LocationID   =  LocationID

How can I do that?

Thanks,
Von
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Vonzkie View Drop Down
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Posts: 133 		Post Options Post Options   Quote Vonzkie Quote  Post ReplyReply Direct Link To This Post Posted: 19-Apr-2012 at 2:45am
Correction:

Customer  Invoice
CustomerID =  CustomerID
LocationID   =  InvoiceLocationID 
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sbelini View Drop Down
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Posts: 786 		Post Options Post Options   Quote sbelini Quote  Post ReplyReply Direct Link To This Post Posted: 19-Apr-2012 at 12:22pm
Hi Vonzkie,
 
Are you talking about Code First?
 
If that's the case you must set the order of the PK when working with composite keys:
 
Column("CustomerID", Order=0)]
 
You can check our Code First samples in the DevForce Resource Center for more details in creating CodeFirst Entities/Navigation Properties.
 
Regards,
   Silvio.
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Vonzkie View Drop Down
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Posts: 133 		Post Options Post Options   Quote Vonzkie Quote  Post ReplyReply Direct Link To This Post Posted: 19-Apr-2012 at 4:14pm
Hi,

I'll try to look at it. :)
How about not Code First?

Thanks,
VOn
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sbelini View Drop Down
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Posts: 786 		Post Options Post Options   Quote sbelini Quote  Post ReplyReply Direct Link To This Post Posted: 19-Apr-2012 at 4:27pm
 
In model first you mark the properties as Entity Keys and set the Referential Constraint accordingly.
 
Silvio.
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Vonzkie View Drop Down
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Posts: 133 		Post Options Post Options   Quote Vonzkie Quote  Post ReplyReply Direct Link To This Post Posted: 22-Apr-2012 at 11:31pm
Hi Silvio,

That works for us.
However, since let's say for example I have my table marked 2 of its column as Entity Key and tried to associate it again with another table but I don't need the criteria being map to the other column. How would I do it?

Thanks,
Von
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Posts: 786 		Post Options Post Options   Quote sbelini Quote  Post ReplyReply Direct Link To This Post Posted: 23-Apr-2012 at 10:09am
Von,
 
Not sure I understand the question.
You are trying to associate 2 tables, but don't want to use the PK_FK association?
 
Please clarify.
 
Silvio.
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Vonzkie View Drop Down
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Posts: 133 		Post Options Post Options   Quote Vonzkie Quote  Post ReplyReply Direct Link To This Post Posted: 23-Apr-2012 at 5:45pm
Hi Silvio,

Here's the original problem that we solved.

Customer
CustomerID
Name
LocationID

Invoice
InvoiceID
CustomerID
Description
InvoiceLocationID

I want to have a one to many relationship with Customer and Invoice but the criteria would be:

Customer  Invoice
CustomerID =  CustomerID
LocationID   =  LocationID

Now, what about adding another table and link it with Customer such as CustomerDetails

CustomerDetails
DetailID
Description
CustomerID

How do I associate this to Customer by bypassing the LocationID because I don't need it in this association.

Thanks,
Von
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IdeaBlade
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Posts: 786 		Post Options Post Options   Quote sbelini Quote  Post ReplyReply Direct Link To This Post Posted: 24-Apr-2012 at 11:50am
Von,
You might want to take a look at the Code First documentation on details on how to accomplish your objective (if possible):
 
 
I hope this helps.
 
Regards,
   Silvio.
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Posts: 133 		Post Options Post Options   Quote Vonzkie Quote  Post ReplyReply Direct Link To This Post Posted: 25-Apr-2012 at 1:35am
Hi Silvio,

Would that be possible with Database First Design? Are there some workarounds?

THanks,
Von
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Posts: 786 		Post Options Post Options   Quote sbelini Quote  Post ReplyReply Direct Link To This Post Posted: 26-Apr-2012 at 2:50pm
Hi Von,
 
You won't be able to create an association where the FK is part of a composite key. Since it's just a FK you better off simply adding it to your CustomerDetails entity.
 
Since this is more of a design question I think you'd benefit more from our Professional Services Team assistance.
Let me know if this interests you, so I can have someone get in touch with you in this regard.
 
Silvio.
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