Databases
StackOverflow2013
Postsdbo
POEF Code First "Invalid column name 'Discriminator'" but no inheritance
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POEF Code First "Invalid column name 'Discriminator'" but no inheritance
    primarykey
    data
    text
    <p>I have a table in my database called SEntries (see below the CREATE TABLE statement). It has a primary key, a couple of foreign keys and nothing special about it. I have many tables in my database similar to that one, but for some reason, this table ended up with a "Discriminator" column on the EF Proxy Class.</p> <p>This is how the class is declared in C#:</p> <pre><code>public class SEntry { public long SEntryId { get; set; } public long OriginatorId { get; set; } public DateTime DatePosted { get; set; } public string Message { get; set; } public byte DataEntrySource { get; set; } public string SourceLink { get; set; } public int SourceAppId { get; set; } public int? LocationId { get; set; } public long? ActivityId { get; set; } public short OriginatorObjectTypeId { get; set; } } public class EMData : DbContext { public DbSet&lt;SEntry&gt; SEntries { get; set; } ... } </code></pre> <p>When I try to add a new row to that table, I get the error:</p> <pre><code>System.Data.SqlClient.SqlException: Invalid column name 'Discriminator'. </code></pre> <p>This problem only occurs if you are inheriting your C# class from another class, but SEntry is not inheriting from anything (as you can see above).</p> <p>In addition to that, once I get the tool-tip on the debugger when I mouse over the EMData instance for the SEntries property, it displays:</p> <pre><code>base {System.Data.Entity.Infrastructure.DbQuery&lt;EM.SEntry&gt;} = {SELECT [Extent1].[Discriminator] AS [Discriminator], [Extent1].[SEntryId] AS [SEntryId], [Extent1].[OriginatorId] AS [OriginatorId], [Extent1].[DatePosted] AS [DatePosted], [Extent1].[Message] AS [Message], [Extent1].[DataEntrySource] AS [DataE... </code></pre> <p>Any suggestions or ideas where to get to the bottom of this issue? I tried renaming the table, the primary key and a few other things, but nothing works.</p> <p>SQL-Table:</p> <pre><code>CREATE TABLE [dbo].[SEntries]( [SEntryId] [bigint] IDENTITY(1125899906842624,1) NOT NULL, [OriginatorId] [bigint] NOT NULL, [DatePosted] [datetime] NOT NULL, [Message] [nvarchar](500) NOT NULL, [DataEntrySource] [tinyint] NOT NULL, [SourceLink] [nvarchar](100) NULL, [SourceAppId] [int] NOT NULL, [LocationId] [int] NULL, [ActivityId] [bigint] NULL, [OriginatorObjectTypeId] [smallint] NOT NULL, CONSTRAINT [PK_SEntries] PRIMARY KEY CLUSTERED ( [SEntryId] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] GO ALTER TABLE [dbo].[SEntries] WITH CHECK ADD CONSTRAINT [FK_SEntries_ObjectTypes] FOREIGN KEY([OriginatorObjectTypeId]) REFERENCES [dbo].[ObjectTypes] ([ObjectTypeId]) GO ALTER TABLE [dbo].[SEntries] CHECK CONSTRAINT [FK_SEntries_ObjectTypes] GO ALTER TABLE [dbo].[SEntries] WITH CHECK ADD CONSTRAINT [FK_SEntries_SourceApps] FOREIGN KEY([SourceAppId]) REFERENCES [dbo].[SourceApps] ([SourceAppId]) GO ALTER TABLE [dbo].[SEntries] CHECK CONSTRAINT [FK_SEntries_SourceApps] GO </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USIngako
    1. USMarcelo Calbucci
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POEF Code First "Invalid column name 'Discriminator'" but no inheritance
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POEF Code First "Invalid column name 'Discriminator'" but no inheritance
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POEF Code First "Invalid column name 'Discriminator'" but no inheritance
      1. This table or related slice is empty.
      1. VTUpMod
    1. COFor the next person who'll spend some time trying to figure this out, what happened is that in another place on the code, I had a class that inherited from SEntry, even though it's not a class that would ever be stored on the DB. So all that I needed to do was to add [NotMapped] as an attribute of that class!
      singulars
      1. POEF Code First "Invalid column name 'Discriminator'" but no inheritance
      1. USMarcelo Calbucci
 

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.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload