Error in super class

[vbhsnh]

is:issue is:open S1E4 video time 1:33...getting error when applying super class.how to remove that error

[romanejaquez]

hi vbhsnh did you migrate your app to Null Safety? Please use the migration tool. I started the project without null safety, and then I migrated to it - apologies if that caused you an issue, but the benefits are greater by being on Null Safety.
Here's the link
https://dart.dev/null-safety/migration-guide#migration-tool

Since Subcategory extends Category and Category is null safe, then both your Category and Subcategory must be null-safe.

Let me know if you are encountering other issues after migrating to Null Safety, so I can help you unblock. Thanks for your feedback and your support - i'm here to help!!!

[vbhsnh]

Hi romanejaquez really appreciate your work, loved your project. I am sending my sample code with you of "Catagory" and "SubCategory" file. Request you to kindly help me fixing the same with some sample code.

Error in the console :
The named parameter 'subCategories' is required, but there's no corresponding argument.
Try adding the required argument.

[romanejaquez]

Your issue is that you're setting the values of the Category class as required and you're not passing the subCategories (it is required). If you still want to keep it this way, then pass some default value to the subcategories constructor parameter, such as (subCategories: []) like the code below:

class SubCategory extends Category { SubCategory({ required String name, required String imgName }): super(imgName: imgName, name: name, subCategories: []); }
I still recommend you switching to null safety whenever possible. Let me know if that works - thank you!

[vbhsnh]

Thanks romanejaquez for your help. "Super" issue got fixed thanks allot for that. Now I have issue in "SelectedCategoryPage" when trying pass item name below error is showing in code. If i mention required modifier i get error in CategoryListPage from where navigation is happening. As suggested by you i will definitely go through null safety.

Console screenshot:

I am new to flutter so troubling you more.

[ddiawara]

Hello , thanks for this course its very very useful. i have the same error

Performing hot reload...
Syncing files to device iPhone 11 Pro...
lib/pages/selectedcategorypage.dart:50:65: Error: The argument type 'Category' can't be assigned to the parameter type 'SubCategory'.
 - 'Category' is from 'package:orilla_fresca/models/category.dart' ('lib/models/category.dart').
 - 'SubCategory' is from 'package:orilla_fresca/models/subcategory.dart' ('lib/models/subcategory.dart').
                                  selectedCategory.subCategories[index],
                                                                ^

[romanejaquez]

Make sure you're casting the selectedCategory.subCategories[index] into a SubCategory object, as in:
selectedCategory.subCategories[index] as SubCategory.
Did you also upgrade the project to null safety?

[ddiawara]

Yeah its probably works

this news configuration

its works . thanks