/// <summary>
/// Find an entity and handle null exception.
/// </summary>
private T FindEntity <T>(int id) where T : class, IIdentifier
{
try
{
var entity = _context.Set <T>().AsNoTracking().SingleOrDefault(arg => arg.Id == id);
if (entity == null)
{
throw new NotFoundException($"Could not find an object with id {id}.");
}
return(entity);
}
catch (InvalidOperationException ex)
{
LoggerExtensions.LogErrorWithInnerExceptions(_logger, ex);
throw new TooManyFoundException(ex.Message, ex);
}
}
/// <summary>
/// Save change, handle exceptions that it might cause and log the event.
/// </summary>
protected void SaveChanges <T>(T entity, EventType eventType) where T : class, IIdentifier
{
try
{
int changes = _context.SaveChanges();
if (changes == 0)
{
throw new NoChangesException($"No changes in context after SaveChanges when doing {eventType}. Type: {typeof(T)} Id: {entity.Id}.");
}
_logger.LogInformation(JsonConvert.SerializeObject(EventObjectFactory <T> .CreateEventObject(entity, eventType), IgnoreReferenced()));
}
catch (DbUpdateException ex)
{
LoggerExtensions.LogErrorWithInnerExceptions(_logger, ex);
throw;
}
}
/// <summary>
/// Delete an entity.
/// </summary>
protected void Delete <T>(Expression <Func <T, bool> > condition) where T : class, IIdentifier
{
try
{
var entity = _context.Set <T>().SingleOrDefault(condition);
if (entity == null)
{
throw new NotFoundException("Object to delete not found.");
}
_context.Remove(entity);
SaveChanges(entity, EventType.Delete);
_logger.LogInformation(JsonConvert.SerializeObject(EventObjectFactory <T> .CreateEventObject(entity, EventType.Delete), IgnoreReferenced()));
}
catch (InvalidOperationException ex)
{
LoggerExtensions.LogErrorWithInnerExceptions(_logger, ex);
throw new TooManyFoundException(ex.Message, ex);
}
}
