JSON Parse not parsing in Flutter if some object is empty

Question

I have a signup form and the backend is PHP. PHP returning success, error data as JSON.

Below is my JSONParse file.

import 'dart:convert';

Signup signupFromJson(String str) => Signup.fromJson(json.decode(str));

String signupToJson(Signup data) => json.encode(data.toJson());

class Signup {
    Errors errors;
    bool success;

    Signup({
        this.errors,
        this.success,
    });

    factory Signup.fromJson(Map<String, dynamic> json) => Signup(

        errors: Errors.fromJson(json["errors"]),
        success: json["success"],
    );

    Map<String, dynamic> toJson() => {
        "errors": errors.toJson(),  
        "success": success,
    };
}

class Errors {
    String password1;
    String email1;
    String name;

    Errors({
        this.password1,
        this.email1,
        this.name,
    });

    factory Errors.fromJson(Map<String, dynamic> json) => Errors(
        password1: json["Password1"],
        email1: json["Email1"],
        name: json["Name"],
    );

    Map<String, dynamic> toJson() => {
        "Password1": password1,
        "Email1": email1,
        "Name": name,
    };
}

Here is sample JSON Data.

If login is failed due to some condition not met.

{"errors":{"Email1":"Email could not be empty",
"Password1":"Password could not be empty",
"Name":"Your name must be between 3 to 30 characters!"},
"success":false}

If login successful

{"success":false}

My JSONParse is working properly if condition not met. I mean it retuning all the errors and Success false.

But if login is successful then it is not working, by checking more I found data is coming fine from PHP.

Signup signupFromJson(String str) => Signup.fromJson(json.decode(str)); - Data is coming in str variable.

factory Signup.fromJson(Map<String, dynamic> json) => Signup(

            errors: Errors.fromJson(json["errors"]), -- If error is nulll then it is not checking the success.
            success: json["success"],
        );

The issue coming here when errors are null then it moved out didn't goto the success section.

What am I doing wrong here?

why don't you just add a condition like json["errors"] ?? "" this will check the value and return "" if the value is null — Vicky Salunkhe
– Vicky Salunkhe, Commented May 3, 2020 at 4:41
@VickySalunkhe thanks for the comment where exactly you want me to add it. — Roxx
– Roxx, Commented May 3, 2020 at 4:44
the line where you added a comment If error is nulll then it is not checking the success. — Vicky Salunkhe
– Vicky Salunkhe, Commented May 3, 2020 at 4:45
I tried this errors: Errors.fromJson(json["errors"] ?? null), but it is still not working. It is still skipping success. — Roxx
– Roxx, Commented May 3, 2020 at 5:00
also have a look at this, I have already posted an answer which kind of fits here (if you looking forward for how to deal with json) stackoverflow.com/a/58708634/9236994 — Vicky Salunkhe
– Vicky Salunkhe, Commented May 3, 2020 at 5:11

Viren V Varasadiya · Accepted Answer · 2020-05-03 05:07:25Z

2

If you get success then you will not get errors, so you have to check null aware where you are passing to error class too.

In Signup.fromJson :

 errors: Errors.fromJson(json["errors"] ?? {}),

In Error Class

 factory Errors.fromJson(Map<String, dynamic> json) => Errors(
        password1: json["Password1"] ?? '',
        email1: json["Email1"] ?? '',
        name: json["Name"] ?? '',
    );

answered May 3, 2020 at 5:07

Viren V Varasadiya

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