Solved

Associative table & linq?

Posted on 2011-02-16
5
536 Views
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!
0
Comment
Question by:Nargzul
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
5 Comments
 
LVL 40

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.

0
 
LVL 1

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.
0
 
LVL 40

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
0
 
LVL 1

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
0
 
LVL 1

Author Closing Comment

by:Nargzul
ID: 34949675
found myself the solution
0

Featured Post

How our DevOps Teams Maximize Uptime

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us. Read the use case whitepaper.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The article shows the basic steps of integrating an HTML theme template into an ASP.NET MVC project
In this article we will learn how to fix  “Cannot install SQL Server 2014 Service Pack 2: Unable to install windows installer msi file” error ?
Using examples as well as descriptions, and references to Books Online, show the documentation available for date manipulation functions and by using a select few of these functions, show how date based data can be manipulated with these functions.
Viewers will learn how to use the INSERT statement to insert data into their tables. It will also introduce the NULL statement, to show them what happens when no value is giving for any given column.

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question