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Spring Controller - inheritance in request parameter

Posted on 2016-09-21
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Last Modified: 2016-10-01
I have the following two classes:

public class Admin {
    private String firstName;
    private String lastName;
    private int id;
    private int type;  // type 1 = admin, type 2 = local admin

    // getters and setters
}

public class Location_Admin extends Admin {
    private int locationId;  
    private String locationName;

    // getters and setters
}

I would like to pass the above class into a single controller method like this:
@RequestMapping(url="/user", method = POST, consumes = APPLICATION_JSON_VALUE)
public void createUser(@RequestBody Admin admin) {
     if (admin instanceof Admin) {
            createAdmin(admin);
     } else if (admin instanceof Location_Admin) {
            createLocationAdmin((Location_Admin)admin);
     }
}

However, when I tested, it always calls the createAdmin method even I provided the locationId and locationName in my JSON request.  May I know how can I call createLocalAdmin if we found locationName (which seems to be Location_Admin instead of Admin) in my method?  I don't want to separate into two request mapping urls because we want to have only single point for our front-end to call.

Thank you.
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Question by:Peter Kwan
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3 Comments
 
LVL 16

Expert Comment

by:gurpsbassi
ID: 41808490
try this:


public void createUser(@RequestBody Admin admin) {
      if (admin instanceof Location_Admin) {
            createLocationAdmin((Location_Admin)admin);
     }
   else {
            createAdmin(admin);
     }
}
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LVL 16

Author Comment

by:Peter Kwan
ID: 41811878
sorry. it does not work. my json is low the following:
{"firstName":"Declan","lastName":"Assyrian","type":2,"locationName":"London"}

the json is interpreted as admin rather than location_admin, so the location name is ignored.
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LVL 16

Accepted Solution

by:
gurpsbassi earned 2000 total points
ID: 41821564
I think this will require some work.

In the JSON I think you will need to pass in another attribute indicating where it is a admin or location_admin.
And then have a look at @JsonSubTypes for jackson (assuming you are using jackson).
I've not used the @JsonSubTypes before but I believe it is what you are looking for.
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