How to transform JSON objects into TS class

I am trying to transform Django response to Angulars User array. There are several reasons, such as different variable names (first_name vs firstName) and having some logic inside Angular User constructor.

Simply Django User => Angular User

Example of server response:

[
  {"id":2,"email":"test1@test.com","first_name":"Name 1","client":{"id":1}}},
  {"id":3,"email":"test2@test.com","first_name":"Name 2","client":{"id":2}}}
]

What I want is to transform to this format:

export class User {
    // contructor that transforms
    id: number;
    email: string;
    firstName: string;
    isClient: boolean = false;
}

I currently have this "solved", but I am wondering if there is a better solution for this.

Inside something.service.ts

public getClients(): Observable<User[]> {
    return this.http.get(this.getClientsUrl)
    .map(r => r.json() || []).map(x => x.map(y => new User(y)));
}

When I say better solution, while this works, it doesn't look very readable. Not a problem if you do this once, but when you have a lot of requests you start thinking of a better solution (one method to deal with this?). What would be a better way? Something like having

return this.http.get(this.getClientsUrl)
.map(transformResponse);