英文:
Extract value of an element from object instance
问题
如何只获取上面的"username"元素值？
英文:
Here is my code to get the current users phone number.
Future<void> getCurrentUser() async {
try {
AuthUser user = await Amplify.Auth.getCurrentUser();
print(user.signInDetails);
} on AuthException catch (e) {
safePrint('Error retrieving current user: ${e.message}');
}
}
The print statement above which extracts the values of the signInDetails array, does not allow me to go deeper one more level. Here is result if I just print the object instance -
CognitoSignInDetailsApiBased {
I/flutter (19338): "signInType": "apiBased",
I/flutter (19338): "username": "+14160000000",
I/flutter (19338): "authFlowType": "USER_SRP_AUTH"
I/flutter (19338): }
How do I just get the value of username element above.
答案1
得分: 1
根据您发布的文档，AuthUser#signInDetails 返回一个SignInDetails的实例，该实例在这里有文档说明。看起来没有一个名为username的访问器，但有一个toJson()方法，该方法返回一个映射。因此，您应该能够通过print(user.signInDetails.toJson()['username'])仅打印用户名值。
英文:
According to the docs you posted, AuthUser#signInDetails returns an instance of SignInDetails, documented here. It looks like there isn't an accessor username, but there is a toJson() method that returns a map. Given that, you should be able to print just the username value via print(user.signInDetails.toJson()['username'])
答案2
得分: 1
你可以这样做：
Future<void> getCurrentUser() async {
try {
AuthUser user = await Amplify.Auth.getCurrentUser();
if (user.signInDetails is CognitoSignInDetailsApiBased) {
String username = (user.signInDetails as CognitoSignInDetailsApiBased).username;
print("用户名：$username");
} else {
print("无法检索到用户名。");
}
} on AuthException catch (e) {
safePrint('检索当前用户时出错：${e.message}');
}
}
CognitoSignInDetailsApiBased 类
英文:
You can do this:
Future<void> getCurrentUser() async {
try {
AuthUser user = await Amplify.Auth.getCurrentUser();
if (user.signInDetails is CognitoSignInDetailsApiBased) {
String username = (user.signInDetails as CognitoSignInDetailsApiBased).username;
print("Username: $username");
} else {
print("Unable to retrieve the username.");
}
} on AuthException catch (e) {
safePrint('Error retrieving current user: ${e.message}');
}
}
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