Question 77846 in Flutter Question posted in
The official Flutter documentation can be found here.

Pass 'Null' to a list. Null Safety – Flutter

Trying to pass null in a list.add(null) call but unable to do this since migrating to the null safety update.

this is the error on bloc

image

this is the model

I have tried adding ?. to the List but having no luck in fixing this.

Tags:

3

Answers


  1. 0

    You need to change 1 line in your model class…

    List<ProductCategory> categoryController;

    TO

    List<ProductCategory?> categoryController;

    Add question mark after ProductCategory will make that list item nullable.

    Login or Signup to reply.
  2. 0

    try to make your list like this

    List< yourObject ? > categoryController;
    Login or Signup to reply.
  3. 0

    You need to make StreamController‘s dataType nullable, to add null.

    final StreamController<List<ProductCategory>?> categoriesController;

    Find more about understanding-null-safety.

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search