Query with parameters - AWS Amplify - Android - aws-appsync

Question

I am having trouble figuring out how to pass a parameter to a query. In this case, I want to get a user by name field. I know I can pass an id, but how do I pass another field? Do I need to create a secondary index?
private AWSAppSyncClient mAWSAppSyncClient;
mAWSAppSyncClient.query(GetUserQuery.builder().build())
.responseFetcher(AppSyncResponseFetchers.CACHE_AND_NETWORK)
.enqueue(userCallback);
query GetUser($id: ID!) {
getUser(id: $id) {
id
userId
name
...
}
}

Answer 1

Use ListUsers (ListXXXX) to query with multiple parameters.
Example - query by name = "aaa":
ModelStringFilterInput modelStringFilterInput = ModelStringFilterInput.builder().eq("aaa").build();
ModelUserFilterInput modelUserFilterInput = ModelUserFilterInput.builder().name(modelStringFilterInput).build();
mAWSAppSyncClient.query(ListUsersQuery.builder().filter(modelUserFilterInput).build())
.responseFetcher(AppSyncResponseFetchers.CACHE_AND_NETWORK)
.enqueue(userCallback);
private GraphQLCall.Callback<ListUsersQuery.Data> userCallback = new GraphQLCall.Callback<ListUsersQuery.Data>() {
#Override
public void onResponse(#Nonnull Response<ListUsersQuery.Data> response) {
Log.d(TAG, response.data().listUsers().items().toString());
}
#Override
public void onFailure(#Nonnull ApolloException e) {
Log.d(TAG, e.toString());
}
};