/// <summary>
/// Scaffolds a new migration.
/// </summary>
/// <param name="migrationName">The migration's name.</param>
/// <param name="rootNamespace">
/// The project's root namespace, <see langword="null" /> to indicate no automatic
/// namespace generation, just use sub-namespace as is.
/// </param>
/// <param name="subNamespace">
/// The migration's sub-namespace. Note: the root-namespace and
/// the sub-namespace should not both be empty.
/// </param>
/// <param name="language">The project's language.</param>
/// <returns>The scaffolded migration.</returns>
public virtual ScaffoldedMigration ScaffoldMigration(
string migrationName,
string?rootNamespace,
string?subNamespace = null,
string?language = null)
{
if (Dependencies.MigrationsAssembly.FindMigrationId(migrationName) != null)
{
throw new OperationException(DesignStrings.DuplicateMigrationName(migrationName));
}
var overrideNamespace = rootNamespace == null;
var subNamespaceDefaulted = false;
if (string.IsNullOrEmpty(subNamespace) && !overrideNamespace)
{
subNamespaceDefaulted = true;
subNamespace = "Migrations";
}
var(key, typeInfo) = Dependencies.MigrationsAssembly.Migrations.LastOrDefault();
var migrationNamespace =
(!string.IsNullOrEmpty(rootNamespace) &&
!string.IsNullOrEmpty(subNamespace))
? rootNamespace + "." + subNamespace
: !string.IsNullOrEmpty(rootNamespace)
? rootNamespace
: subNamespace;
if (subNamespaceDefaulted)
{
migrationNamespace = GetNamespace(typeInfo?.AsType(), migrationNamespace !);
}
var sanitizedContextName = _contextType.Name;
var genericMarkIndex = sanitizedContextName.IndexOf('`');
if (genericMarkIndex != -1)
{
sanitizedContextName = sanitizedContextName[..genericMarkIndex];
/// <summary>
/// Scaffolds a new migration.
/// </summary>
/// <param name="migrationName"> The migration's name. </param>
/// <param name="rootNamespace">
/// The project's root namespace, <c>null</c> to indicate no automatic
/// namespace generation, just use sub-namespace as is.
/// </param>
/// <param name="subNamespace">
/// The migration's sub-namespace. Note: the root-namespace and
/// the sub-namespace should not both be empty.
/// </param>
/// <param name="language"> The project's language. </param>
/// <returns> The scaffolded migration. </returns>
public virtual ScaffoldedMigration ScaffoldMigration(
string migrationName,
string rootNamespace,
string subNamespace = null,
string language = null)
{
Check.NotEmpty(migrationName, nameof(migrationName));
if (Dependencies.MigrationsAssembly.FindMigrationId(migrationName) != null)
{
throw new OperationException(DesignStrings.DuplicateMigrationName(migrationName));
}
var overrideNamespace = rootNamespace == null;
var subNamespaceDefaulted = false;
if (string.IsNullOrEmpty(subNamespace) && !overrideNamespace)
{
subNamespaceDefaulted = true;
subNamespace = "Migrations";
}
var lastMigration = Dependencies.MigrationsAssembly.Migrations.LastOrDefault();
var migrationNamespace =
(!string.IsNullOrEmpty(rootNamespace) &&
!string.IsNullOrEmpty(subNamespace))
? rootNamespace + "." + subNamespace
: !string.IsNullOrEmpty(rootNamespace)
? 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();
if (!string.IsNullOrEmpty(rootNamespace))
{
builder.Append(rootNamespace);
builder.Append(".");
}
builder.Append("Migrations.");
if (sanitizedContextName.EndsWith("Context", StringComparison.Ordinal))
{
builder.Append(sanitizedContextName, 0, sanitizedContextName.Length - 7);
}
else
{
builder
.Append(sanitizedContextName)
.Append("Migrations");
}
migrationNamespace = builder.ToString();
}
else
{
Dependencies.OperationReporter.WriteWarning(DesignStrings.ForeignMigrations(migrationNamespace));
}
}
var modelSnapshot = Dependencies.MigrationsAssembly.ModelSnapshot;
var lastModel = Dependencies.SnapshotModelProcessor.Process(modelSnapshot?.Model)?.GetRelationalModel();
var upOperations = Dependencies.MigrationsModelDiffer
.GetDifferences(lastModel, Dependencies.Model.GetRelationalModel());
var downOperations = upOperations.Count > 0
? Dependencies.MigrationsModelDiffer.GetDifferences(Dependencies.Model.GetRelationalModel(), lastModel)
: new List <MigrationOperation>();
var migrationId = Dependencies.MigrationsIdGenerator.GenerateId(migrationName);
var modelSnapshotNamespace = overrideNamespace
? migrationNamespace
: GetNamespace(modelSnapshot?.GetType(), migrationNamespace);
var modelSnapshotName = sanitizedContextName + "ModelSnapshot";
if (modelSnapshot != null)
{
var lastModelSnapshotName = modelSnapshot.GetType().Name;
if (lastModelSnapshotName != modelSnapshotName)
{
Dependencies.OperationReporter.WriteVerbose(DesignStrings.ReusingSnapshotName(lastModelSnapshotName));
modelSnapshotName = lastModelSnapshotName;
}
}
if (upOperations.Any(o => o.IsDestructiveChange))
{
Dependencies.OperationReporter.WriteWarning(DesignStrings.DestructiveOperation);
}
var codeGenerator = Dependencies.MigrationsCodeGeneratorSelector.Select(language);
var migrationCode = codeGenerator.GenerateMigration(
migrationNamespace,
migrationName,
upOperations,
downOperations);
var migrationMetadataCode = codeGenerator.GenerateMetadata(
migrationNamespace,
_contextType,
migrationName,
migrationId,
Dependencies.Model);
var modelSnapshotCode = codeGenerator.GenerateSnapshot(
modelSnapshotNamespace,
_contextType,
modelSnapshotName,
Dependencies.Model);
return(new ScaffoldedMigration(
codeGenerator.FileExtension,
lastMigration.Key,
migrationCode,
migrationId,
migrationMetadataCode,
GetSubNamespace(rootNamespace, migrationNamespace),
modelSnapshotCode,
modelSnapshotName,
GetSubNamespace(rootNamespace, modelSnapshotNamespace)));
}
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 OperationException(DesignStrings.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.LogWarning(
DesignEventId.ForeignMigrations,
() => DesignStrings.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.LogDebug(
DesignEventId.ReusingSnapshotName,
() => DesignStrings.ReusingSnapshotName(lastModelSnapshotName));
modelSnapshotName = lastModelSnapshotName;
}
}
if (upOperations.Any(o => o.IsDestructiveChange))
{
_logger.LogWarning(
DesignEventId.DestructiveOperation,
() => DesignStrings.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)));
}
