Generated Columns Not Compatible with PSQL 9.x

Getting an error on generating some Identity Framework tables:

fail: Microsoft.EntityFrameworkCore.Database.Command[20102]
      Failed executing DbCommand (14ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      CREATE TABLE "AspNetRoleClaims" (
          "Id" integer NOT NULL GENERATED BY DEFAULT AS IDENTITY,
          "RoleId" uuid NOT NULL,
          "ClaimType" text NULL,
          "ClaimValue" text NULL,
          CONSTRAINT "PK_AspNetRoleClaims" PRIMARY KEY ("Id"),
          CONSTRAINT "FK_AspNetRoleClaims_Roles_RoleId" FOREIGN KEY ("RoleId") REFERENCES "Roles" ("Id") ON DELETE CASCADE
      );
Npgsql.PostgresException (0x80004005): 42601: syntax error at or near "GENERATED"

   at Npgsql.NpgsqlConnector.<>c__DisplayClass161_0.<<ReadMessage>g__ReadMessageLong|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Npgsql.NpgsqlConnector.<>c__DisplayClass161_0.<<ReadMessage>g__ReadMessageLong|0>d.MoveNext() in C:\projects\npgsql\src\Npgsql\NpgsqlConnector.cs:line 1032
--- End of stack trace from previous location where exception was thrown ---
   at Npgsql.NpgsqlDataReader.NextResult(Boolean async, Boolean isConsuming) in C:\projects\npgsql\src\Npgsql\NpgsqlDataReader.cs:line 444
   at Npgsql.NpgsqlDataReader.NextResult() in C:\projects\npgsql\src\Npgsql\NpgsqlDataReader.cs:line 332
   at Npgsql.NpgsqlCommand.ExecuteDbDataReader(CommandBehavior behavior, Boolean async, CancellationToken cancellationToken) in C:\projects\npgsql\src\Npgsql\NpgsqlCommand.cs:line 1219
   at Npgsql.NpgsqlCommand.ExecuteNonQuery(Boolean async, CancellationToken cancellationToken) in C:\projects\npgsql\src\Npgsql\NpgsqlCommand.cs:line 1042
   at Npgsql.NpgsqlCommand.ExecuteNonQuery() in C:\projects\npgsql\src\Npgsql\NpgsqlCommand.cs:line 1025
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.Execute(IRelationalConnection connection, DbCommandMethod executeMethod, IReadOnlyDictionary`2 parameterValues)
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.ExecuteNonQuery(IRelationalConnection connection, IReadOnlyDictionary`2 parameterValues)
   at Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationCommandExecutor.ExecuteNonQuery(IEnumerable`1 migrationCommands, IRelationalConnection connection)
   at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration)
[... my app here]

As far as I can tell, the GENERATED keyword isn’t valid on Postgres 9.x, that’s a thing in 10.x. I’d just upgrade but Google Cloud SQL only supports 9.6…

[austindrenski]

Duplicate of #681.

By default, the provider assumes that the backend is running the latest version of PostgreSQL. To opt out, you must explicitly configure the provider to use a specific version:

builder.UseNpgsql(
    connectionString,
    options => options.SetPostgresVersion(new Version(9, 6)));

I’m closing this issue for now, but please give that a try and let us know if you have any further questions related to this issue.

[roji]

You seem to be activating the IDENTITY columns feature, which was only introduced in PostgreSQL 10. Remove ForNpgsqlUseIdentityColumns() from your model or upgrade to a newer version of PostgreSQL.

If the problem still persists, please post your model definition (especially your OnModelCreating()).