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並前往https://answerlib.com/question/69335/the-operator--isnt-defined-for-the-class-object-flutter.html

运算符'[]'未为类“对象”定义。扑 - IT答乎

StreamBuilder<QuerySnapshot>( stream: _categoryProvider.category.snapshots(), ... import 'package:cloud_firestore/cloud_firestore.dart'; ...

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