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(DesignCoreStrings.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", StringComparison.Ordinal))
{
builder.Append(sanitizedContextName.Substring(0, sanitizedContextName.Length - 7));
}
else
{
builder
.Append(sanitizedContextName)
.Append("Migrations");
}
migrationNamespace = builder.ToString();
}
else
{
_logger.Value.LogWarning(DesignCoreStrings.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(DesignCoreStrings.ReusingSnapshotName(lastModelSnapshotName));
modelSnapshotName = lastModelSnapshotName;
}
}
if (upOperations.Any(o => o.IsDestructiveChange))
{
_logger.Value.LogWarning(DesignCoreStrings.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)));
}