默认头像

Question

我有一个应用程序，当用户注册时，个人资料照片URL是必需的，尽管我注意到不是每个人都想在注册时添加个人资料照片。所以我希望，当用户不添加个人资料照片，然后一个默认的个人资料照片URL被添加，而不是保存到Database。下面是返回URL的函数:

// add_a_file_to_aws_s3
Future<GetUrlResult> uploadImage(File? file, String? key) async {
try {
await Amplify.Storage.uploadFile(
local: file!,
key: key!,
onProgress: (progress) {
// ignore: avoid_print
print('Fraction completed: ${progress.getFractionCompleted()}');
},
);
GetUrlResult urlResult = await Amplify.Storage.getUrl(key: key);
return urlResult;
} on StorageException {
rethrow;
}
}

，下面是注册后将用户信息添加到Database的代码:

final result = await Amplify.Auth.signUp(
username: username.text.trim(),
password: password.text.trim(),
options: CognitoSignUpOptions(userAttributes: userAttributes),
);
GetUrlResult urlResult = await uploadImage(file, 'Profile Photos');
await userController.addUserData(
username.text,
password.text,
emailAddress.text,
urlResult.toString(),
int.parse('zero'),
int.parse('zero'),
birthday.text,
gender.text,
location.text,
phoneNumber.text,
);
setState(() {
isSignUpComplete = result.isSignUpComplete;
});

我创建了userController();文件，这就是我创建addUserData函数的地方。现在我需要帮助添加默认的个人资料照片URL到Database，当用户不添加任何。谢谢你

Answer 1

Just do:

Future<GetUrlResult> uploadImage(File? file, String? key) async {
try {
await Amplify.Storage.uploadFile(
local: file!,
key: key!,
onProgress: (progress) {
// ignore: avoid_print
print('Fraction completed: ${progress.getFractionCompleted()}');
},
);
GetUrlResult urlResult = await Amplify.Storage.getUrl(key: key);
if(urlResult.isEmpty){ //just add this
default_url = 'your_photo_url';
return default_url;
} else {
return urlResult;
}
} on StorageException {
rethrow;
}
}