How to send Enum data inside request object - spring-boot

Question

I have created an enum like the below to store static dropdown value.
#JsonFormat(shape = JsonFormat.Shape.OBJECT)
public enum Days {
MONDAY(1,"Monday"), TUESDAY(2,"Tuesday"),THURSDAY(4,"Thursday"), FRIDAY(5,"Friday"), SATURDAY(6,"Saturday"),
SUNDAY(7,"Sunday");
private final Integer key;
private final String value;
Days(Integer key, String value) {
this.key = key;
this.value = value;
}
public Integer getKey() {
return key;
}
public String getValue() {
return value;
}
}
I have written a below endpoint to list enum data as a JSON response
#GetMapping("/getenums")
public List<Days> getenums() {
return Arrays.asList(Days.values());
}
which results in an array of JSON Objects like below
[{"key":1,"value":"Monday"},{"key":2,"value":"Tuesday"},{"key":4,"value":"Thursday"},{"key":5,"value":"Friday"},{"key":6,"value":"Saturday"},{"key":7,"value":"Sunday"}]
I have sample domain like below
public class User {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long userId;
private String name;
private Days day;
private Month month;
}
Below is my controller,
#PostMapping("/user")
public User createInstructor(#RequestBody User user) {
return userRepository.save(user);
}
While trying to save the user using the below request data getting bad request how can I resolve this
{
"name": "Pradeep",
"day": {
"key": 1,
"value": "Monday"
},
"month": "JUNE"
}

Answer 1

If you really want to return the complete enum object in your REST API then one solution could be adding a custom deserializer to it:
#JsonFormat(shape = JsonFormat.Shape.OBJECT)
public enum Days {
MONDAY(1,"Monday"), TUESDAY(2,"Tuesday"),THURSDAY(4,"Thursday"), FRIDAY(5,"Friday"), SATURDAY(6,"Saturday"),
SUNDAY(7,"Sunday");
private final Integer key;
private final String value;
Days(Integer key, String value) {
this.key = key;
this.value = value;
}
public Integer getKey() {
return key;
}
public String getValue() {
return value;
}
#JsonCreator
public static Days fromObject(Map<String, Object> obj) {
if (obj != null && obj.containsKey("key") && obj.containsKey("value")) {
Integer key = obj.get("key");
String value = obj.get("value");
if (key != null) {
for (Days day : Days.values()) {
if (key.equals(e.getKey())) {
return day;
} else {
return null;
}
}
}
return null;
}
return null;
}
}
Additionally, you might want to tell Hibernate how to store your Enum in the database. You can use #Enumerated(EnumType.STRING) for that as follows:
public class User {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long userId;
private String name;
#Enumerated(EnumType.STRING)
private Days day;
private Month month;
}
This will store it as a String. The other option is ORDINAL, which will persist the Enum as an Integer.