Question

I have two tables Team_DATA and Driver_PROFILE_DATA in an SQL database. For every driver_profile there can be many teams.

So there’s a one-to-many relation on the driver_profile to team_data table. I want to update a team_data foreign key reference in the Driver_profile table of an already existing record to another team_data record that already exists.

I want to do this using entity framework. Here what I want: having a list of teams to select from, finding the record in the team_data table and updating it’s FK in the driver_profile appropriately.

So in the code below, the passed parameter is the newly selected team out of the team_data table.

Now I need it to update it FK reference in the Driver_profile table.

Here’s what I’ve got:

UPDATE: Code Updated. It does not save it to database, even if I call savechanges. No errors.

 public Driver_PROFILE_DATA GetSelectedTeam(string team)
    {
        ObjectQuery<Team_DATA> td = raceCtxt.Team_DATA;
        ObjectQuery<Driver_PROFILE_DATA> drpr = raceCtxt.Driver_PROFILE_DATA;

        var selteam = from t in td where t.Team_Name == team select t;

        Team_DATA newteam = new Team_DATA();

        newteam = selteam.Select(x => x).First();

        // get driver_profile with associated team_data
        var data = from a in raceCtxt.Driver_PROFILE_DATA.Include("Team_DATA") select a;
        // put it in driver_profile entity
        profileData = data.Select(x => x).First();

        profileData.Team_DATAReference.Attach(newteam);

        return profileData;
    }

Answer 1

Entity Framework should give you a nice Association between the two classes, Update the references as you would using POCOs and stay away from the ID values.

Something like:

newTeam.Profile.Teams.Remove(profileData);  // separate from old Profile
profileData.Teams.Add(newTeam);

EDIT:

I made a little test, it is sufficient to set the reference to the Parent object:

newTeam.Profile = profileData;