How to Update an Entity in a Google app engine data store partially

Question

I am using Objectify in Google App Engine for Data Store. I am having an Entity with 6 Properties. For Example,

• Key (id)

• FirstName

• LastName

• Age

• mobile_Number

• Email

  I need to write an Update Endpoint for the Entity. I want that update Endpoint should be able to update the Entity with the specified fields Not the Entire Entity. For Example If I want to update the mobile_number, it should update the mobile number alone. or If i want to update the firstName it should update that only.

For that I need to write a common method to update the Entity based on the fields.

Many thanks in Advance!

Answer 1

Yes i fixed this update in the following way.

Got the input parameter as Hashmap where i can get the user's properties that to be updated. The hashmap's key should be same as Entity's property value.

public Response update(HashMap<String, String> ProfileEntity) {
 //update logic
}

and updated the value based on the following if condition:

        ProfileEntity existingEntity = getById(ProfileEntity.get("key"));

        if(existingEntity == null)
            System.out.println("Invalid Profile Key");

        if(ProfileEntity.containsKey("firstName"))
            existingEntity.setFirstName(ProfileEntity.get("firstName"));

        if(ProfileEntity.containsKey("lastName"))
            existingEntity.setLastName(ProfileEntity.get("lastName"));

        if(ProfileEntity.containsKey("age"))
            existingEntity.setAge(ProfileEntity.get("age")));

        if(ProfileEntity.containsKey("mobile_Number"))
            existingEntity.setMobileNumber(ProfileEntity.get("mobile_Number"));

        super.save(existingEntity);