Okay, here's the scenario. I have 3 tables. One called aspnet_Users one called Categories and a linking table called User_Categories. aspnet_Users and Categories both have primary keys (UserId and ID respectively). The linking table has only two columns: CategoryID and UserId, and there are foreign key relationships setup for each column AND I have a unique key setup for the two columns on User_Categories. This sets up a many-to-many relationship between the aspnet_Users table and the Categories table. I generated my entities edmx file from this database setup, and everything looks perfect and works for almost all operations.
What I want to do is add a new category from a form (which works perfecly by itself), and also, at the same time, associate a specific user with that newly submitted category. When I try to do this I get the error in my subject line. Here is the code I'm using to try this (ctx is my entities context object):
public ActionResult Create(Category category, Guid userId)
{
aspnet_Users user = ctx.aspnet_Users.SingleOrDefault(x => x.UserId == userId);
ctx.Categories.AddObject(category);
user.Categories.Add(category);
ctx.SaveChanges();;
return RedirectToAction("Index");
}
Why doesn't this work?
I assume the full exception message is something similar to:
Unable to update the EntitySet YourTableName because it has a DefiningQuery and no InsertFunction element exists in the ModificationFunctionMapping element to support the current operation.
This will occur if your DB's table doesn't have a primary key defined.
Add a primary key to your table (using SQL Server Management Studio or whatever), and update your .edmx
model from the database.
Error: Unable to update the EntitySet because it has a DefiningQuery
Twice I got this error, twice I searched for answers everywhere, and in the end my mappings was messed up or the database had no primary key or something. I suggest checking it all out...
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