CODEWITHSUNDEEP
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Omar Hussein
Omar Hussein

Reputation: 1147

Post request body improperly sent

so I'm trying to make a register POST request, it's body to be sent should look something like this:

{
  "user": {
    "email": "[email protected]",
    "firstname": "string",
    "lastname": "string",
    "gender": "female",
    "phone_number": "+2120694263542",
    "birthdate": "2020-06-24",
    "country": "EGY"
  }
}

So I've first created a RegisterUpsert model, its class looks like this:

class RegisterUpsert {
  String email;
  String firstname;
  String lastname;
  String gender;
  String phoneNumber;
  String birthdate;
  String country;

  RegisterUpsert();

  RegisterUpsert.fromJson(Map<String, dynamic> json)
      : email = json['email'],
        firstname = json['firstname'],
        lastname = json['lastname'],
        gender = json['gender'],
        phoneNumber = json['phone_number'],
        birthdate = json['birthdate'],
        country = json['country'];

  Map<String, dynamic> toJson() => {
        'email': email,
        'firstname': firstname,
        'lastname': lastname,
        'gender': gender,
        'phone_number': phoneNumber,
        'birthdate': birthdate,
        'country': country,
      };
}

Now, I've completed my flow of data collection and processing and have an instance of RegisterUpsert with all the data I need, namely registerBodyFinal, now I'm trying to call it here:

    debugPrint({"user": registerBodyFinal.toJson()}.toString());
    showLoading(context);
    final response = await http.post(url,
        body: {
          "user": {registerBodyFinal.toJson()}
        }.toString());
    Navigator.pop(context);

The debugPrint seems to print the body as I want it, but it seems that's not what's being sent, because trying with postman with the exact debugPrinted lines as the body works, but the response on the flutter app indicates the server is getting an improper/missing JSON. what distinction could be made between the first body I show in this question, and the body I'm posting in flutter?

My guess is that parsing with toString parses all my brackets and so on as a part of a string and that breaks it? but then unless I use the .toString() I get a castError on runtime:

InternalLinkedHashMap<String,Dynamic> is not a subtype of type 'String' in type cast

Thanks for any help.

Upvotes: 0

Views: 113

Answers (1)

Richard Heap
Richard Heap

Reputation: 51722

When you have a tree of JSON, don't encode parts of it and then further enclose those in parent maps. Enclose the maps (or classes with toJson methods returning maps) inside the parent maps and finally call json.encode once on the root map (or list).

The correct syntax you need is:

  var upsert = RegisterUpsert()
    ..email = 'e'
    ..firstname = 'f'
    ..lastname = 'l'
    ..gender = 'f'
    ..phoneNumber = 'ph'
    ..birthdate = 'today'
    ..country = 'nl';

  var bodyMap = <String, dynamic>{'user': upsert};

  final response = await http.post(url, body: json.encode(bodyMap));

Upvotes: 1

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