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1 import db_constraints;
2 
3 class Student
4 {
5     private int _Id;
6     @PrimaryKeyColumn @NotNull
7     @property int Id()
8     {
9         return _Id;
10     }
11     @property void Id(int value)
12     {
13         setter(_Id, value);
14     }
15     private string _Name;
16     @property string Name()
17     {
18         return _Name;
19     }
20     @property void Name(string value)
21     {
22         setter(_Name, value);
23     }
24     private string _Certificates;
25     // Certificates can only have values that
26     // are among the set below.
27     @SetConstraint!("A1", "A2", "B1", "C1")
28     @property string Certificates()
29     {
30         return _Certificates;
31     }
32     @property void Certificates(string value)
33     {
34         setter(_Certificates, value);
35     }
36     this(int Id_, string Name_, string Certificates_)
37     {
38         this._Id = Id_;
39         this._Name = Name_;
40         this._Certificates = Certificates_;
41         initializeKeyedItem();
42     }
43 
44     mixin KeyedItem!();
45 }
46 
47 // A1 and B1 are both allowed in the set so no error is raise here
48 auto paul = new Student(1, "Paul", "A1,B1");
49 // we can see paul's certificates are the same as they came in
50 assert(paul.Certificates == "A1,B1");
51 
52 // all of jane's certificates are acceptable but not in order
53 auto jane = new Student(2, "Jane", "A1,B1,A2");
54 // the set constraint sorts the certificates for you
55 assert(jane.Certificates == "A1,A2,B1");
56 
57 // now lets try with some duplicates
58 jane.Certificates = "A1,A2,B1,A1";
59 // the set constraint will also remove duplicates
60 assert(jane.Certificates == "A1,A2,B1");
61 
62 // if we enter in certificates that are not allowed we should expect an exception
63 import std.exception : assertThrown;
64 assertThrown!CheckConstraintException(new Student(3, "Mark", "A1,A2,D1,D2"));