Provide fix and test for #61

Author: acupofjose

Postgrest/Linq/WhereExpressionVisitor.cs

@@ -111,7 +111,7 @@ protected override Expression VisitMethodCall(MethodCallExpression node)
 						Filter = new QueryFilter(column, Operator.Contains, GetArgumentValues(node));
 					else
 						Filter = new QueryFilter(column, Operator.Like, "*" + GetArgumentValues(node).First() + "*");
-					
+
 					break;
 				default:
 					throw new NotImplementedException("Unsupported method");
@@ -155,6 +155,14 @@ private void HandleUnaryExpression(string column, Operator op, UnaryExpression u
 			{
 				HandleConstantExpression(column, op, constantExpression);
 			}
+			else if (unaryExpression.Operand is MemberExpression memberExpression)
+			{
+				HandleMemberExpression(column, op, memberExpression);
+			}
+			else if (unaryExpression.Operand is NewExpression newExpression)
+			{
+				HandleNewExpression(column, op, newExpression);
+			}
 		}
 
 		/// <summary>

PostgrestTests/Linq.cs

@@ -98,6 +98,11 @@ public async Task TestLinqWhere()
 
 			foreach (var q in query7.Models)
 				Assert.IsNotNull(q.DateTimeValue);
+
+			var query8 = await client.Table<KitchenSink>()
+				.Where(x => x.DateTimeValue == DateTime.Now)
+				.Get();
+
 		}
 
 		[TestMethod("Linq: OnConflict")]