Entity Framework errors while saving base class if there is any inheritance - vb.net

Question

I am using EF 6.1. I have a model "Request" built from the wizard directly from my database. In my context file (EMContext.vb) I have
Public Overridable Property Requests As DbSet(Of Request)
When I type in
Dim db As New EMContext
Dim req As New Request()
With req
.RequestedBy = "bar"
.EventName = "Goo"
.RequestedOn = Now
.RequestStatusID = 1
End With
db.Requests.Add(req)
db.SaveChanges()
everything works exactly as expected. No problems. It saves.
However, if I add a class (anywhere in the app)
Class foo
Inherits Request
Public Property s As String
End Class
and then run the exact same code I get
{"An error occurred while updating the entries. See the inner exception for details."}
Looking at the inner exception:
{"Invalid column name 's'.
Invalid column name 'Discriminator'."}
Why in the heck is it even looking at the inherited class properties?
BTW, if I remove all the properties from the inherited class, I still get the Invalid Column 'Discriminator' error.

Answer 1

Then create a custom class that the json parses to and then you can call the Entity and make it from this class.
<Serializable()>
Public Class jSonParsedObject
'properties that match the Entity object
'custom properties you need for other work
End Class
Usage:
Dim jsonObj As jSonParsedObject = SomeMethodThatParsesAndReturnsData()
Dim req As New Request()
With req
.RequestedBy = jsonObj.RequestedBy
.EventName = jsonObj.EventName
.RequestedOn = jsonObj.RequestedOn
.RequestStatusID = jsonObj.RequestStatusID
End With
...