public static Migration GetMigration([NotNull] this IMigrationsAssembly assembly, [NotNull] string nameOrId)
{
Check.NotNull(assembly, nameof(assembly));
Check.NotEmpty(nameOrId, nameof(nameOrId));
var migration = assembly.FindMigration(nameOrId);
if (migration == null)
{
throw new InvalidOperationException(Strings.MigrationNotFound(nameOrId));
}
return(migration);
}
public virtual ScaffoldedMigration ScaffoldMigration(
[NotNull] string migrationName,
[NotNull] string rootNamespace)
{
Check.NotEmpty(migrationName, nameof(migrationName));
Check.NotEmpty(rootNamespace, nameof(rootNamespace));
if (_migrationsAssembly.FindMigration(migrationName) != null)
{
throw new InvalidOperationException(Strings.DuplicateMigrationName(migrationName));
}
var lastMigration = _migrationsAssembly.Migrations.LastOrDefault();
var migrationNamespace = GetNamespace(lastMigration?.GetType(), rootNamespace + ".Migrations");
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 = _contextType.Name + "ModelSnapshot";
if (modelSnapshot != null)
{
var lastModelSnapshotName = modelSnapshot.GetType().Name;
if (lastModelSnapshotName != modelSnapshotName)
{
_logger.Value.LogVerbose(Strings.ReusingSnapshotName(lastModelSnapshotName));
modelSnapshotName = lastModelSnapshotName;
}
}
if (upOperations.Any(o => o.IsDestructiveChange))
{
_logger.Value.LogWarning(Strings.DestructiveOperation);
}
var migrationCode = _migrationCodeGenerator.Generate(
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.Language,
lastMigration?.Id,
migrationCode,
migrationId,
migrationMetadataCode,
GetSubnamespace(rootNamespace, migrationNamespace),
modelSnapshotCode,
modelSnapshotName,
GetSubnamespace(rootNamespace, modelSnapshotNamespace)));
}