public async Task <UserView> Handle(UserViewBy query)
{
var queryable = _entities.Query <User>();
if (query.Id.HasValue)
{
queryable = queryable.Where(EntityExtensions.ById <User>(query.Id.Value));
}
else if (query.Principal != null && query.Principal.Identity.IsAuthenticated)
{
queryable = queryable.Where(EntityExtensions.ById <User>(query.Principal.Identity.GetUserId <int>()));
}
else
{
queryable = queryable.Where(QueryUsers.ByName(query.Name));
}
// project before querying to only get the data needed for the view.
var projection = await queryable.Select(x => new
{
UserId = x.Id,
UserName = x.Name,
PrimaryEmailAddress = x.EmailAddresses.Where(y => y.IsPrimary)
.Select(y => new
{
y.Value,
y.HashedValue,
})
.FirstOrDefault(),
})
.SingleOrDefaultAsync().ConfigureAwait(false);
if (projection == null)
{
return(null);
}
var view = new UserView
{
UserId = projection.UserId,
UserName = projection.UserName,
PrimaryEmailAddress = projection.PrimaryEmailAddress.Value,
PrimaryEmailHash = projection.PrimaryEmailAddress.HashedValue,
};
return(view);
}
