StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POUpdating a relationship in Entity Framework generates SQL error
primarykey
Id
19493321
data
AcceptedAnswerId
19493454
AnswerCount
1
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2013-10-21T11:28:38.930
FavoriteCount
0
LastActivityDate
2013-10-21T11:53:09.390
LastEditDate
2013-10-21T11:37:06.063
LastEditorUserId
341330
OwnerUserId
341330
ParentId
0
PostTypeId
1
Score
1
ViewCount
110
LastEditorDisplayName
text
Body
I'm getting headaches here. I've got a one to zero-or-one relationship between a Session and a User object, designed in Entity Framework 4 using the model first approach. <ul> <li>A User should have a session (one)</li> <li>A Session can have a User (zero-to-one).</li> </ul> So, in runtime I pull a session from the database using <pre><code>Session session = context.Sessions.FirstOrDefault(s => s.Token.Equals(token)); </code></pre> and after that I create a user, created based on user input like this <pre><code>user = context.Users.Create(); user.GUID = Guid.NewGuid(); user.Username = username; user.Firstname = firstname; user.Lastname = lastname; user.Session = session; context.Users.Add(user); context.SaveChanges(); </code></pre> and when I save, the SQL server throws an exception telling me that the GUID I try to insert in the database already exists, because yeah, it does. The problem is, that it shouldnt insert, it should update the session and fill the forein key that belongs with it. The foreign key resides on the User side of the relation, this is alright, right? edit The user should be a new user. Updating the user is not what I'm trying to accomplish. Also, the error is because the code tries to insert the session with the same primary key value, instead of just updating it's foreing keys. Here's a chronological list of what should be done: <ul> <li>Session gets created</li> <li>Session gets saved</li> <li>Session gets selected from the database</li> <li>User gets created</li> <li>User <-> Session relations gets set</li> <li>User gets saved</li> </ul> And what I get is: Violation of PRIMARY KEY constraint 'PK_Sessions'. Cannot insert duplicate key in object 'dbo.Sessions'. The duplicate key value is VALUE. The statement has been terminated. Please help me out, I've been fiddling with this for the past 2 hours.
Tags
<c#><sql><sql-server><entity-framework>
Title
Updating a relationship in Entity Framework generates SQL error
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USCraimasjien
UserOwnerUserId
1. USCraimasjien
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POUpdating a relationship in Entity Framework generates SQL error
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId
1. COI have deleted my answer, since your problem has changed
 singulars
 PostPostId
 POUpdating a relationship in Entity Framework generates SQL error
 UserUserId
 USMarco

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.