public async Task <IEnumerable <string> > MigrateAsync(CancellationToken cancellationToken = default(CancellationToken))
{
var pending = await GetPendingMigrationsAsync(cancellationToken);
if (pending.Any())
{
using (var transaction = _context.Database.BeginTransactionIfNotYetRunnig())
{
using (var historyContext = new DataMigrationContext(_context.Database.Connection))
{
historyContext.Database.UseTransaction(_context.Database.CurrentTransaction.UnderlyingTransaction);
foreach (var item in pending)
{
var migration = Activator.CreateInstance(_localMigrations[item]);
_context.ChangeTracker.Entries().ToList().ForEach(p => p.State = EntityState.Detached);
await _invoker(_context, migration, cancellationToken);
await _context.SaveChangesAsync();
historyContext.HistoryRows.Add(new DataMigrationHistoryRow {
MigrationId = item
});
await historyContext.SaveChangesAsync();
}
transaction.Commit();
}
}
}
return(pending);
}
public async Task <IEnumerable <string> > GetAppliedMigrationsAsync(CancellationToken cancellationToken = default(CancellationToken))
{
using (var historyContext = new DataMigrationContext(_context.Database.Connection))
{
if (_context.Database.CurrentTransaction != null)
{
historyContext.Database.UseTransaction(_context.Database.CurrentTransaction.UnderlyingTransaction);
}
var appliedMigrations = await historyContext.HistoryRows
.OrderBy(p => p.MigrationId)
.Select(p => p.MigrationId)
.ToListAsync(cancellationToken);
var localMigrationKeys = _localMigrations.Keys.OrderBy(p => p).ToList();
appliedMigrations = appliedMigrations.Where(p => _localMigrations.ContainsKey(p)).ToList();
return(appliedMigrations);
}
}
