[英]Convert Firestore DocumentSnapshot to Map in Flutter
[英]How to fill Map from DocumentSnapshot in Using Firestore in Flutter?
我正在嘗試從Flutter中的DocumentSnapshot填充 Map。
但我在代碼中有語法錯誤。 這是我正在嘗試使用的代碼:
Future<Map<String, dynamic>> particularItem(String productId) async {
DocumentSnapshot prodRef = await _productReference.doc(productId).get();
Map<String, dynamic> itemDetail = new Map();
itemDetail['image'] = await getProductsImage(prodRef.data()['imageId'][0]);
itemDetail['color'] = prodRef.data()['color'];
itemDetail['size'] = prodRef.data()['size'];
itemDetail['price'] = prodRef.data()['price'];
itemDetail['name'] = prodRef.data()['name'];
itemDetail['productId'] = productId;
return itemDetail;
}
這是我在以下代碼段中遇到的錯誤:
The operator '[]' isn't defined for the type 'Object'. Try defining the operator '[]'.
prodRef.data()['imageId']
prodRef.data()['color']
prodRef.data()['size']
prodRef.data()['price']
prodRef.data()['name']
您應該在使用前強制轉換 prodRef.data()。 在 dart object 中不能不使用運算符 []
final data = prodRef.data() as Map<String, dynamic>;
然后你可以從數據變量中獲取屬性。 有關更多信息,您可以在此處閱讀Firebase 文檔
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