public MigrationSpecification LoadMigrationIfPresent(int version)
{
if (!MigrationFiles.ContainsKey(version))
{
return(null);
}
return(FromFileContents(MigrationFiles[version]));
}
private static void ReportJson(MigrationFiles files)
{
var sb = new StringBuilder();
sb.AppendLine("//BEGIN");
sb.AppendLine("{");
sb.AppendLine(" \"MigrationFile\": \"" + SerializePath(files.MigrationFile) + "\",");
sb.AppendLine(" \"MetadataFile\": \"" + SerializePath(files.MetadataFile) + "\",");
sb.AppendLine(" \"SnapshotFile\": \"" + SerializePath(files.SnapshotFile) + "\"");
sb.AppendLine("}");
sb.AppendLine("//END");
ConsoleCommandLogger.Output(sb.ToString());
}
private static void ReportJson(MigrationFiles files)
{
Reporter.Output.WriteLine(JsonConvert.SerializeObject(files, Formatting.Indented));
}
private static void ReportJson(MigrationFiles files) => ConsoleCommandLogger.Json(files);
/// <summary>
/// Removes the previous migration.
/// </summary>
/// <param name="projectDir">The project's root directory.</param>
/// <param name="rootNamespace">The project's root namespace.</param>
/// <param name="force">Don't check to see if the migration has been applied to the database.</param>
/// <param name="language">The project's language.</param>
/// <returns>The removed migration files.</returns>
// TODO: DRY (file names)
public virtual MigrationFiles RemoveMigration(
string projectDir,
string?rootNamespace,
bool force,
string?language)
{
var files = new MigrationFiles();
var modelSnapshot = Dependencies.MigrationsAssembly.ModelSnapshot;
if (modelSnapshot == null)
{
throw new OperationException(DesignStrings.NoSnapshot);
}
var codeGenerator = Dependencies.MigrationsCodeGeneratorSelector.Select(language);
IModel?model = null;
var migrations = Dependencies.MigrationsAssembly.Migrations
.Select(m => Dependencies.MigrationsAssembly.CreateMigration(m.Value, _activeProvider))
.ToList();
if (migrations.Count != 0)
{
var migration = migrations[migrations.Count - 1];
model = Dependencies.SnapshotModelProcessor.Process(migration.TargetModel);
if (!Dependencies.MigrationsModelDiffer.HasDifferences(
model.GetRelationalModel(), Dependencies.SnapshotModelProcessor.Process(modelSnapshot.Model).GetRelationalModel()))
{
var applied = false;
try
{
applied = Dependencies.HistoryRepository.GetAppliedMigrations().Any(
e => e.MigrationId.Equals(migration.GetId(), StringComparison.OrdinalIgnoreCase));
}
catch (Exception ex) when(force)
{
Dependencies.OperationReporter.WriteVerbose(ex.ToString());
Dependencies.OperationReporter.WriteWarning(
DesignStrings.ForceRemoveMigration(migration.GetId(), ex.Message));
}
if (applied)
{
if (force)
{
Dependencies.Migrator.Migrate(
migrations.Count > 1
? migrations[migrations.Count - 2].GetId()
: Migration.InitialDatabase);
}
else
{
throw new OperationException(DesignStrings.RevertMigration(migration.GetId()));
}
}
var migrationFileName = migration.GetId() + codeGenerator.FileExtension;
var migrationFile = TryGetProjectFile(projectDir, migrationFileName);
if (migrationFile != null)
{
Dependencies.OperationReporter.WriteInformation(DesignStrings.RemovingMigration(migration.GetId()));
File.Delete(migrationFile);
files.MigrationFile = migrationFile;
}
else
{
Dependencies.OperationReporter.WriteWarning(
DesignStrings.NoMigrationFile(migrationFileName, migration.GetType().ShortDisplayName()));
}
var migrationMetadataFileName = migration.GetId() + ".Designer" + codeGenerator.FileExtension;
var migrationMetadataFile = TryGetProjectFile(projectDir, migrationMetadataFileName);
if (migrationMetadataFile != null)
{
File.Delete(migrationMetadataFile);
files.MetadataFile = migrationMetadataFile;
}
else
{
Dependencies.OperationReporter.WriteVerbose(
DesignStrings.NoMigrationMetadataFile(migrationMetadataFile));
}
model = migrations.Count > 1
? Dependencies.SnapshotModelProcessor.Process(migrations[migrations.Count - 2].TargetModel)
: null;
}
else
{
Dependencies.OperationReporter.WriteVerbose(DesignStrings.ManuallyDeleted);
}
}
var modelSnapshotName = modelSnapshot.GetType().Name;
var modelSnapshotFileName = modelSnapshotName + codeGenerator.FileExtension;
var modelSnapshotFile = TryGetProjectFile(projectDir, modelSnapshotFileName);
if (model == null)
{
if (modelSnapshotFile != null)
{
Dependencies.OperationReporter.WriteInformation(DesignStrings.RemovingSnapshot);
File.Delete(modelSnapshotFile);
files.SnapshotFile = modelSnapshotFile;
}
else
{
Dependencies.OperationReporter.WriteWarning(
DesignStrings.NoSnapshotFile(
modelSnapshotFileName,
modelSnapshot.GetType().ShortDisplayName()));
}
}
else
{
var modelSnapshotNamespace = modelSnapshot.GetType().Namespace;
Check.DebugAssert(!string.IsNullOrEmpty(modelSnapshotNamespace), "modelSnapshotNamespace is null or empty");
var modelSnapshotCode = codeGenerator.GenerateSnapshot(
modelSnapshotNamespace,
_contextType,
modelSnapshotName,
model);
if (modelSnapshotFile == null)
{
modelSnapshotFile = Path.Combine(
GetDirectory(projectDir, null, GetSubNamespace(rootNamespace, modelSnapshotNamespace)),
modelSnapshotFileName);
}
Dependencies.OperationReporter.WriteInformation(DesignStrings.RevertingSnapshot);
File.WriteAllText(modelSnapshotFile, modelSnapshotCode, Encoding.UTF8);
}
return(files);
}
