public virtual ScaffoldedMigration ScaffoldMigration( [NotNull] string migrationName, [NotNull] string rootNamespace, [CanBeNull] string subNamespace = null) { Check.NotEmpty(migrationName, nameof(migrationName)); Check.NotEmpty(rootNamespace, nameof(rootNamespace)); if (_migrationsAssembly.FindMigrationId(migrationName) != null) { throw new InvalidOperationException(CommandsStrings.DuplicateMigrationName(migrationName)); } var subNamespaceDefaulted = false; if (string.IsNullOrEmpty(subNamespace)) { subNamespaceDefaulted = true; subNamespace = "Migrations"; } var lastMigration = _migrationsAssembly.Migrations.LastOrDefault(); var migrationNamespace = rootNamespace + "." + subNamespace; if (subNamespaceDefaulted) { migrationNamespace = GetNamespace(lastMigration.Value?.AsType(), migrationNamespace); } var sanitizedContextName = _contextType.Name; var genericMarkIndex = sanitizedContextName.IndexOf('`'); if (genericMarkIndex != -1) { sanitizedContextName = sanitizedContextName.Substring(0, genericMarkIndex); } if (ContainsForeignMigrations(migrationNamespace)) { if (subNamespaceDefaulted) { var builder = new StringBuilder() .Append(rootNamespace) .Append(".Migrations."); if (sanitizedContextName.EndsWith("Context")) { builder.Append(sanitizedContextName.Substring(0, sanitizedContextName.Length - 7)); } else { builder .Append(sanitizedContextName) .Append("Migrations"); } migrationNamespace = builder.ToString(); } else { _logger.Value.LogWarning(CommandsStrings.ForeignMigrations(migrationNamespace)); } } var modelSnapshot = _migrationsAssembly.ModelSnapshot; var lastModel = modelSnapshot?.Model; var upOperations = _modelDiffer.GetDifferences(lastModel, _model); var downOperations = upOperations.Any() ? _modelDiffer.GetDifferences(_model, lastModel) : new List <MigrationOperation>(); var migrationId = _idGenerator.GenerateId(migrationName); var modelSnapshotNamespace = GetNamespace(modelSnapshot?.GetType(), migrationNamespace); var modelSnapshotName = sanitizedContextName + "ModelSnapshot"; if (modelSnapshot != null) { var lastModelSnapshotName = modelSnapshot.GetType().Name; if (lastModelSnapshotName != modelSnapshotName) { _logger.Value.LogDebug(CommandsStrings.ReusingSnapshotName(lastModelSnapshotName)); modelSnapshotName = lastModelSnapshotName; } } if (upOperations.Any(o => o.IsDestructiveChange)) { _logger.Value.LogWarning(CommandsStrings.DestructiveOperation); } var migrationCode = _migrationCodeGenerator.GenerateMigration( migrationNamespace, migrationName, upOperations, downOperations); var migrationMetadataCode = _migrationCodeGenerator.GenerateMetadata( migrationNamespace, _contextType, migrationName, migrationId, _model); var modelSnapshotCode = _migrationCodeGenerator.GenerateSnapshot( modelSnapshotNamespace, _contextType, modelSnapshotName, _model); return(new ScaffoldedMigration( _migrationCodeGenerator.FileExtension, lastMigration.Key, migrationCode, migrationId, migrationMetadataCode, GetSubNamespace(rootNamespace, migrationNamespace), modelSnapshotCode, modelSnapshotName, GetSubNamespace(rootNamespace, modelSnapshotNamespace))); }