Cannot use mutating member on immutable value of type
When you apply type casting to value types (such structs), if succeed, you receive immutable copy of requested value:
(self.data as! ModelOne) // this is copy of data
The only way (as known to me) how you can mutate values that need to be casted - reassign value (as @Sahil Beri pointed you need declare variable):
func someFunc() {
if var data = data as? ModelOne {
data.setSub(ModelOne.SubModelOne(someVar: 2, otherVar: 1))
self.data = data // you can do this since ModelOne conforms to SuperModel
}
}
Use like this,
struct UserAttributes {
var name:String?
var organizationID:String?
var email:String?
mutating func parseUserAttributes(attribues:[AWSCognitoIdentityProviderAttributeType])->UserAttributes{
for type in attribues{
if type.name == "name"{
name = type.value
}else if(type.name == "family_name"){
organizationID = type.value
}else if(type.name == "custom:role_id"){
role = type.value
}else if(type.name == "email"){
email = type.value
}
}
}
}
In some other file call like this,
var userAttributes = UserAttributes()
userAttributes = userAttributes.parseUserAttributes(attribues:attributes)