CODEWITHSUNDEEP
androidiosflutterdartflutter-provider
princeoo7
princeoo7

Reputation: 1121

How to use Setter for a Provider Class in Another Provider Class with flutter

I have a General Provider which is called on the start of the app.

it fetches some data via API. Normally I would keep it to that Provider for flutter but as the app is growing I think its better to separate the logic for all.

This first API also brings in the user data. Now I also have a UserProvider in the app. I created the below for it.

class UserProvider extends ChangeNotifier {
  UserModel _user;
  UserProvider(this._user);

  set setUser(user){
    _user = user;
    notifyListeners();
  }  
  
  UserModel get getUser => _user;
}

No error here but question is how to call this setter in GeneralProvider class?

The way I know is as below:

  1. UserProvider(UserModel(your_data));

  2. `Provider.of(context).setUser(UserModel(your_data));

First one works for me. and second one don't in the provider part.

Real issue with using first way:

In my main.dart where all the providers are provided, I need to do it like this.

ChangeNotifierProvider.value(
  value: UserProvider(UserModel(your_data),
),

What I preferred is updating the UserProvider when the general api is called for base data.

Upvotes: 3

Views: 3210

Answers (3)

Paul Slm
Paul Slm

Reputation: 483

Updating this answer to newest version

context.watch<T>() // makes the widget listen to changes on T
context.read<T>() // returns T without listening to it

So here:

context.read<UserProvider>().setUser(NEW_USER);

Source: https://pub.dev/packages/provider#reading-a-value

Upvotes: 0

MCB
MCB

Reputation: 876

My solution was this setter in UserProvider class:

  void setUser(User s) {
    _user = s;
    notifyListeners();
  }

wrap your widget with:

 return Consumer<UserProvider>(builder: (_,provider,__){
   return WhateverYouWantToBuild(
   ...
   ),
});

and then calling it with:

provider.setUser(newValue!);

Upvotes: 1

Aldy Yuan
Aldy Yuan

Reputation: 2055

Here's the way:

Provider.of<UserProvider>(context, listen: false).setUser = your_parameter_here;

Probably you already found the solution, if not this is the answer.

Upvotes: 0

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