public User GetUniqueUser(Expression <Func <User, bool> > predicate, bool required)
{
if (predicate == null)
{
throw new ArgumentNullException("predicate");
}
using (LocanDataContext ctx = this.GetDbContext()) {
User result = null;
var query = (from u in ctx.Users
select u)
.Where(predicate);
if (required)
{
result = query.Single();
}
else
{
result = query.SingleOrDefault();
}
return(result);
}
}
public IList <User> GetUsers(Expression <Func <User, bool> > predicate = null)
{
if (predicate == null)
{
predicate = Const <User> .LinqExpression.LinqExpressionFuncAlwaysTrue;
}
using (LocanDataContext ctx = this.GetDbContext()) {
IList <User> result = (from u in ctx.Users
select u)
.Where(predicate)
.ToList();
return(result);
}
}
public User AddUser(User user)
{
if (user == null)
{
throw new ArgumentNullException("user");
}
using (LocanDataContext ctx = this.GetDbContext()) {
// make sure that the api key is not already in use
User existingUser = this.GetUniqueUser(u => u.ApiKey == user.ApiKey, false);
if (existingUser != null)
{
string message = string.Format("The ApiKey [{0}] is already being used by another user", user.ApiKey);
throw new ApiKeyAlreadyInUseException(message);
}
user.Id = Guid.NewGuid();
user = ctx.Users.Add(user);
ctx.SaveChanges();
return(user);
}
}