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Finding DbContext classes...
Using context 'MyDbContext'.
System.NullReferenceException: Object reference not set to an instance of an object.
   at Devart.Common.Entity.Migrations.b.a(c A_0, String A_1, String A_2, String A_3)
   at Devart.Common.Entity.Migrations.b.b(AlterColumnOperation A_0)
   at Devart.Common.Entity.Migrations.b.a(AlterColumnOperation A_0)
   at Devart.Common.Entity.Migrations.b.b(MigrationOperation A_0)
   at Devart.Common.Entity.Migrations.b.a(IEnumerable`1 A_0)
   at Devart.Common.Entity.Migrations.g.a(IEnumerable`1 A_0, au A_1)
   at Devart.Data.MySql.Entity.Migrations.MySqlEntityMigrationSqlGenerator.Generate(IReadOnlyList`1 migrationOperations, IModel model)
   at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.GenerateDownSql(Migration migration, Migration previousMigration)
   at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration)
   at Microsoft.EntityFrameworkCore.Design.MigrationsOperations.UpdateDatabase(String targetMigration, String contextType)
   at Microsoft.EntityFrameworkCore.Tools.Cli.DatabaseUpdateCommand.<>c__DisplayClass0_0.<Configure>b__0()
   at Microsoft.Extensions.CommandLineUtils.CommandLineApplication.Execute(String[] args)
   at Microsoft.EntityFrameworkCore.Tools.Cli.Program.Main(String[] args)
Object reference not set to an instance of an object.

Code: Select all

ef migrations list
yyyymmddhhmmss_BeforeVarcharSizeChange
yyyymmddhhmmss_EmailLength50To150
yyyymmddhhmmss_AnyAfter
yyyymmddhhmmss_Latest

Code: Select all

ALTER TABLE my_table_name
MODIFY COLUMN email varchar(150) NOT NULL
INSERT INTO __EFMigrationsHistory (MigrationId, ProductVersion)
VALUES ('yyyymmddhhmmss_EmailLength50To150', '1.0.0-rtm-21431');