/// <summary>
/// Roll back all collection migrations after specified version.
/// Use -1 as a version parameter to downgrade all existing migrations.
/// </summary>
/// <param name="collection">The target collection name.</param>
/// <param name="version">The desired migration version.</param>
public void Down(string collection, long version = -1)
{
//Console.WriteLine($"Discovering migrations in {_locator.LocatedAssembly.FullName}");
var appliedMigrations = _dbMigrations.GetAppliedMigrations(collection);
var downgradedMigrations =
_locator.GetMigrations(new MigrationVersion(collection, version), MigrationVersion.Max(collection))
.Where(m => appliedMigrations.Any(x => x.Version == m.Version.Version && string.Equals(x.Collection, m.Version.Collection)))
.OrderByDescending(x => x.Version.Collection)
.ThenByDescending(x => x.Version.Version)
.ToList();
_logger?.LogInformation($"Found ({downgradedMigrations.Count}) migrations in {_locator.LocatedAssembly.FullName}");
foreach (var migration in downgradedMigrations)
{
try
{
migration.Down();
_dbMigrations.CancelMigration(migration.Version);
_logger?.LogInformation($"Applied down migration: {migration.Version.Version} [{migration.Version.Description}].");
}
catch (Exception ex)
{
_logger?.LogError(ex, $"Could not apply down migration {migration.Version.Version} [{migration.Version.Description}]!");
break;
}
}
}
/// <summary>
/// Roll back all collection migrations after specified version.
/// Use -1 as a version parameter to downgrade all existing migrations.
/// </summary>
/// <param name="collection">The target collection name.</param>
/// <param name="version">The desired migration version.</param>
public void Down(string collection, long version = -1)
{
Console.WriteLine($"Discovering migrations in {_locator.LocatedAssembly.FullName}");
var appliedMigrations = _dbMigrations.GetAppliedMigrations(collection);
var downgradedMigrations =
_locator.GetMigrations(new MigrationVersion(collection, version), MigrationVersion.Max(collection))
.Where(m => appliedMigrations.Any(x => x.Version == m.Version.Version && string.Equals(x.Collection, m.Version.Collection)))
.OrderByDescending(x => x.Version.Collection)
.ThenByDescending(x => x.Version.Version)
.ToList();
Console.WriteLine($"Found ({downgradedMigrations.Count}) migrations in {_locator.LocatedAssembly.FullName}");
foreach (var migration in downgradedMigrations)
{
Console.WriteLine($"Applying: {migration.Version}");
migration.Down();
_dbMigrations.CancelMigration(migration.Version);
Console.WriteLine($"Applied: {migration.Version}");
}
}