Not saving data by Hive

Question

I want to save the value of a text field using Hive so that the value is not lost when the application is opened and closed. But this is not done correctly.

Code:

ElevatedButton(
      onPressed: () {
        box.put(1, userNameController.text);
        var name = box.get(1);
        task?.userName = userNameController.text;
        print(name);
        print(task?.userName);
      },
      child: Text('Save'),
    ),

Here I have put the input value with key 1 and then get it. In my model class, I have a userName whose input value of that textfield is supposed to be equal to that class model, and finally by calling that model and class, I will display the input value as text. But the input value of the textfield is not equal to the user class! And when printing in the console, I also encounter null.

Answer 1

The rule is, you have to instantiate the object first before assigning its properties to some values. In this example code:

taskModel? task;
task?.userName = 'something';

The second line does nothing. You have to use a constructor first:

taskModel? task; // It's ok to define first, and instantiate later

// Somewhere
task = taskModel(
  // put the required parameters
  // ...
);
task?.userName = "something";

Now that last line will actually assign the value "something" to the userName property of task.