How to add mock data containing authorized owner to Amplify (either through GraphiQL or directly to AppSync)? - amazon-s3

Question

I'm working on a React app and testing some CRUD functionality by mocking the backend, creating some data through GraphiQL, and running the app (amplify mock, then yarn start).
I want to be able to create mock data tied to my user as the owner because most types in the schema are set up with owner authorization:
type XYZ
#auth(rules: [{ allow: owner, operations: [update, delete, create] }]) {
id: ID!
...more types...etc
}
Right now, I
run amplify mock
Go to GraphiQL local endpoint (192.etc....)
Run some createXYZ mutations to create data
Run my app w yarn start
login with testUser & password
Test the deleteXYZ button which should ideally remove a particular XYZ from the mocked data this is what doesn't work
I suspect what's happening is that I didn't run the createXYZ mutation as testUser, just as a generic GraphiQL user, so the owner property isn't tied to "myUserId". Is that the problem here?
How would I specify owner on my create mutations in GraphiQL?
This is the error I'm getting, pretty sure it means the XYZ object's owner is different than my testUser submitting the deleteXYZ request:
Error while executing Local DynamoDB
{
"version": "2018-05-29",
"operation": "DeleteItem",
"key": {
"id": {
"S": "18b152a6-c98d-4336-be74-1e122191"
}
},
"condition": {
"expression": "( #owner0 = :identity0) AND attribute_exists(#id)",
"expressionNames": {
"#owner0": "owner",
"#id": "id"
},
"expressionValues": {
":identity0": {
"S": "fd2a7758-f7ba-4d57-bdb0-e5346492"
}
}
}
}
Could I have to add the owner id in Amplify's GraphiQL Auth options popup?

Answer 1

I just ran into this issue. I was able to work around it by putting my Cognito User Sub in the username field.