Error in CodeFirst Seed with migrations : Modifying a column with the 'Identity' pattern is not supported. Column: 'CreatedAt'. Table: 'CodeFirstDatabaseSchema.Category'.

Hi,
I have activated migrations on my Azure Mobile Services project. I filled the new seed function Inside the Configuration.cs class of the migrations. If the tables are empty, the seed function is going without any problems. When my AddorUpdate tries to update
the first object I get the error in the inner exception : "Modifying a column with the 'Identity' pattern is not supported. Column: 'CreatedAt'. Table: 'CodeFirstDatabaseSchema.Category'."
Part of my code is as follows:
context.categories.AddOrUpdate(
new Category { Id="1", Code="GEN", Text="General"},
new Category { Id="2", Code="POL", Text="Politics"},
new Category { Id="3", Code="FAS", Text="Fashion"},
new Category { Id="4", Code="PEO", Text="People"},
new Category { Id="5", Code="TEC", Text="Technology"},
new Category { Id="6", Code="SPO", Text="Sport"},
new Category { Id="7", Code="LIV", Text="Living"}
Any help is welcomed. Thanks.
Faical SAID Highwave Creations

This occurred to me because I changed my POCO models to inherit from EntityData after I had already created my database without the extra Azure Mobile Service properties (UpdatedAt, CreatedAt, Deleted). The only way I fixed it was to drop the database and
start over with my classes inheriting from EntityData from the beginning. If you can't do that then I would create a new table with EntityData models and see how that database is created and manually update your tables to match those. Here's an image of one
of my tables from the management console on Azure. You can see that CreatedAt is an index.

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How to fix "Modifying a column with the 'Identity' pattern is not supported"

When doing Code First Migrations my mobile service always errors in the seed method with: 'Modifying a column with the 'Identity' pattern is not supported. Column: 'CreatedAt'. Table: 'CodeFirstDatabaseSchema.Methodology' for the CreatedAt column. All my
models inherit from EntityData.
// Sample model
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using Microsoft.WindowsAzure.Mobile.Service;
namespace sbp_ctService.Models
public class Methodology : EntityData
public Methodology()
this.Scenarioes = new List<Scenario>();
public string Id { get; set; }
[Required]
[StringLength(50)]
public string EntryMethod { get; set; }
[Required]
[StringLength(50)]
public string TestDirection { get; set; }
[Required]
[StringLength(50)]
public string PassCriteria { get; set; }
[Required]
[StringLength(50)]
public string Dependency { get; set; }
public bool ExtraInfo { get; set; }
public virtual ICollection<Scenario> Scenarioes { get; set; }
And in my Configuration.cs file during an update here's my seed method:
protected override void Seed(sbp_ctService.Models.sbp_ctContext context)
// This method will be called after migrating to the latest version.
context.Methodologies.AddOrUpdate(
m => m.Id,
new Methodology { Id = "Methodology1", EntryMethod = "P/F", PassCriteria = "P/F", Dependency = "None", ExtraInfo = false, TestDirection = "Round" },
new Methodology { Id = "Methodology2", EntryMethod = "P/F", PassCriteria = "Best", Dependency = "None", ExtraInfo = false, TestDirection = "Round" },
new Methodology { Id = "Methodology3", EntryMethod = "P/F", PassCriteria = "Best", Dependency = "None", ExtraInfo = false, TestDirection = "In/Out" },
new Methodology { Id = "Methodology4", EntryMethod = "P/F", PassCriteria = "Best", Dependency = "None", ExtraInfo = false, TestDirection = "Out" }
For some reason on an update the CreatedAt field is created and given a value of null. So of course on an insert/update it will error because CreatedAt is an Identity field.
I've tried to configure the modelBuilder in my context to tell it that CreatedAt is an identity field, but that still doesn't work.
modelBuilder.Entity<Methodology>()
.Property(m => m.CreatedAt)
.HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
So far the only way to fix this is by commenting out my Seed data, but it's not a fix. I've seen other solutions where you can force it to not serialize certain fields, but I don't know if those solutions apply.

So I think this occurs because you might have created the database (Code-first) with POCOs that didn't have the CreatedAt field in them. I think that's what I did and the easiest way to fix it for me was to delete my database and re-create it with my POCOs
inheriting from Entity Data from the very beginning. We were still in development so it worked out for us but I know some people might not be able to do that. Here's what my table looks like after it was created correctly:
USE [database_name]
GO
/****** Object: Table [sbp_ct].[Methodologies] Script Date: 2/24/2015 9:48:45 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [schema_name].[Methodologies] (
[Id] NVARCHAR (128) NOT NULL,
[EntryMethod] NVARCHAR (50) NOT NULL,
[TestDirection] NVARCHAR (50) NOT NULL,
[PassCriteria] NVARCHAR (50) NOT NULL,
[Dependency] NVARCHAR (50) NOT NULL,
[ExtraInfo] BIT NOT NULL,
[Version] ROWVERSION NOT NULL,
[CreatedAt] DATETIMEOFFSET (7) NULL,
[UpdatedAt] DATETIMEOFFSET (7) NULL,
[Deleted] BIT NOT NULL,
[Name] NVARCHAR (MAX) NULL
GO
CREATE CLUSTERED INDEX [IX_CreatedAt]
ON [schema_name].[Methodologies]([CreatedAt] ASC);
GO
ALTER TABLE [schema_name].[Methodologies]
ADD CONSTRAINT [PK_schema_name.Methodologies] PRIMARY KEY NONCLUSTERED ([Id] ASC);
Does yours look something like that?

"Modifying a column with the 'Identity' pattern is not supported. Column: 'CreatedAt'.

I am using code fist migration and second time I run the service, I got this error.
"Modifying
a column with the 'Identity'pattern
is not supported. Column:
'CreatedAt'.
context.Cars.AddOrUpdate(c => c.Id,
new Car { Id = "60B0891B-C3CF-41A6-9BE0-BCCCE5949E6B", Image = "ic_highlander", Name = "Highlander", Description = "4 SEATER, FULL DAY (10 HRS), DOWNTOWN EXCLUDING INDUSTRIAL ZONE, WITH ENGLISH SPEAKING DRIVER", SeatingCapacity = 4, Luggage = 2, Rates = 20000.00M, AirportCode = "YGN" },
new Car { Id = "BAA205B5-C43F-490E-A83B-81F0EBDA2D97", Image = "ic_super_custom", Name = "Super Custom", Description = "4 SEATER, FULL DAY (10 HRS), DOWNTOWN EXCLUDING INDUSTRIAL ZONE, WITH ENGLISH SPEAKING DRIVER", SeatingCapacity = 4, Luggage = 2, Rates = 20000.00M, AirportCode = "YGN" },
new Car { Id = "DD68E56D-3967-4D32-A959-BEFBCB70FC4B", Image = "ic_mark_ii_grande", Name = "MarkII GRANDE", Description = "4 SEATER, FULL DAY (10 HRS), DOWNTOWN EXCLUDING INDUSTRIAL ZONE, WITH ENGLISH SPEAKING DRIVER", SeatingCapacity = 4, Luggage = 2, Rates = 20000.00M, AirportCode = "YGN" },
new Car { Id = "8EDDC308-FB63-469B-8A6A-B2360D61892D", Image = "ic_hiace_commuter_13", Name = "Hiace commuter", Description = "4 SEATER, FULL DAY (10 HRS), DOWNTOWN EXCLUDING INDUSTRIAL ZONE, WITH ENGLISH SPEAKING DRIVER", SeatingCapacity = 4, Luggage = 2, Rates = 20000.00M, AirportCode = "MDL" }

Hi,
Thanks for posting here.
We are looking into this and will update you with solution. Stay tuned for details
Girish Prajwl

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Error in CodeFirst Seed with migrations : Modifying a column with the 'Identity' pattern is not supported. Column: 'CreatedAt'. Table: 'CodeFirstDatabaseSchema.Category'.

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