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Associative table & linq?

Posted on 2011-02-16
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Last Modified: 2012-05-11
Hi!

I've the following schema in my database:

Group:
Id
Name


Rights
Id
Name

AND an associative table
Group_Right
IdRight; IdGroup

Linq generate me for this only two entities, which is right.

I'm using LINQ through wcf, so when I've my objects they are all unlinked and not tracked by the database. I'm using my own POCO entities.

My question is:

When I receive my group and right I should attach to this group, how do I tell linq to save the association?

If have something like

public SaveGroupsRights(Group group, List<Rights> rights){
group.Rights = rights;
DataContext.Save();
}

The association isn't saved in my DB(In this exemple, I've already attached every object to my datacontext).

Thank you!
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Question by:Nargzul
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LVL 41

Expert Comment

by:Kyle Abrahams
ID: 34909561
Using LinqToSQl or RIA?  

You need to add an association between your tables (either in your EDML or DBML).  Also if you plan on using this client side you need to add load options to include the child table data.

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Author Comment

by:Nargzul
ID: 34909704
Nether, Entity Framwork4.0(Linq to entities).

You don't understand, I'm generating this model from the database, which has already all needed foreign keys.

I've already this association, because if I load data from the database, Group_right I set are correctly used to make collections.
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LVL 41

Expert Comment

by:Kyle Abrahams
ID: 34916455
It mentions here that you have to first pull it from the database or update:
http://tonesdotnetblog.wordpress.com/2008/08/15/linq-to-entities-disconnected-crud/

and some more samples:
http://naspinski.net/post/Getting-started-with-Linq-To-Entities.aspx
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Accepted Solution

by:
Nargzul earned 0 total points
ID: 34916558
I already pull them from the database before calling the specified method.

I found a work-around, by calling the _context.ObjectStateManager.ChangeRelationshipState
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Author Closing Comment

by:Nargzul
ID: 34949675
found myself the solution
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