Question

I’m attempting to add a mirgration before I run my project.

I get the following error when I attempt to add a mirgration

One or more validation errors were detected during model generation:

\tSystem.Data.Entity.Edm.EdmEntityType: : EntityType 'MembershipUser' has no key defined. Define the key for this EntityType.
\tSystem.Data.Entity.Edm.EdmEntitySet: EntityType: EntitySet 'MembershipUsers' is based on type 'MembershipUser' that has no keys defined.

Here is the class:

    <Table("aspnet_Membership")>
Public Class UserMembership
    Inherits User

    Public Property ApplicationId As Guid

    Public Property Comment As String

End Class

Its parent:

<ReadOnlyAttribute(True), Table("aspnet_Users")>
Public Class User

    <Key, DatabaseGenerated(DatabaseGeneratedOption.Identity), DisplayName("User Id")>
    Public Property UserId As Guid

    <Required, StringLength(256)>
    Public Property UserName As String

    <Required, StringLength(256)>
    Public Property LoweredUserName As String

    <StringLength(16)>
    Public Property MobileAlias As String

    <Required>
    Public Property IsAnonymous As Boolean

    <Required>
    Public Property LastActivityDate As DateTime
End Class

Finally OnModelCreating:

modelBuilder.Entity(Of MembershipUser)().Map(Sub(m)
                                                 m.MapInheritedProperties()
                                                 m.ToTable("aspnet_Membership")
                                             End Sub)

Anyone know what I’m doing wrong?

Answer 1

The exception talks about MembershipUser but your class has the name UserMembership. Is this a typo?