[GraphQLResponse.Error{message='Cannot return null for non-nullable type: 'AWSTimestamp' within parent 'Blog'

[JalalFaisalRassam]

i use flutter framework with amplify and when i built my app i face the this issue when i insert the the posts inside a Blog which they have one to many relationship

this happens when i add post inside the log
and the while the Blog is added successfully the Posts addition fails and the error appears

/////////////////////////////////////
the console logs
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
W/amplify:aws-datastore(17179): at java.lang.Thread.run(Thread.java:919)
I/amplify:aws-datastore(17179): Successfully removed from mutations outboxPendingMutation{mutatedItem=SerializedModel{id='d9d44936-9eee-4e55-b22a-1c93c74c3346', serializedData={createdAt=null, id=d9d44936-9eee-4e55-b22a-1c93c74c3346, blog=SerializedModel{id='9f7c596c-b50b-49ed-a94a-6b1f41d2227e', serializedData={id=9f7c596c-b50b-49ed-a94a-6b1f41d2227e}, modelName=Blog}, title=لللل, updatedAt=null}, modelName=Post}, mutationType=CREATE, mutationId=b14450dd-ddb8-11ef-aae8-31c86b5b7f2d, predicate=MatchAllQueryPredicate}
I/amplify:flutter:datastore(17179): Unhandled DataStoreHubEvent: outboxMutationFailed
I/amplify:flutter:datastore(17179): OutboxMutationFailedEvent{errorType=UNKNOWN, operation=CREATE, modelName=Post, model=SerializedModel{id='d9d44936-9eee-4e55-b22a-1c93c74c3346', serializedData={createdAt=null, id=d9d44936-9eee-4e55-b22a-1c93c74c3346, blog=SerializedModel{id='9f7c596c-b50b-49ed-a94a-6b1f41d2227e', serializedData={id=9f7c596c-b50b-49ed-a94a-6b1f41d2227e}, modelName=Blog}, title=لللل, updatedAt=null}, modelName=Post}}
E/amplify:flutter:datastore(17179): GraphQLResponseException{message=Mutation failed. Failed mutation = PendingMutation{mutatedItem=SerializedModel{id='d9d44936-9eee-4e55-b22a-1c93c74c3346', serializedData={createdAt=null, id=d9d44936-9eee-4e55-b22a-1c93c74c3346, blog=SerializedModel{id='9f7c596c-b50b-49ed-a94a-6b1f41d2227e', serializedData={id=9f7c596c-b50b-49ed-a94a-6b1f41d2227e}, modelName=Blog}, title=لللل, updatedAt=null}, modelName=Post}, mutationType=CREATE, mutationId=b14450dd-ddb8-11ef-aae8-31c86b5b7f2d, predicate=MatchAllQueryPredicate}. AppSync response contained errors = [GraphQLResponse.Error{message='Cannot return null for non-nullable type: 'AWSTimestamp' within parent 'Blog' (/createPost/blog/_lastChangedAt)', locations='null', path='[GraphQLPathSegment{value='createPost'}, GraphQLPathSegment{value='blog'}, GraphQLPathSegment{value='_lastChangedAt'}]', extensions='null'}, GraphQLResponse.Error{message='Cannot return null for non-nullable type: 'Int' within parent 'Blog' (/createPost/blog/_version)', locations='null', path='[GraphQLPathSegment{value='createPost'}, GraphQLPathSegment{value='blog'}, GraphQLPathSegment{value='_version'}]', extensions='null'}, GraphQLResponse.Error{message='Cannot return null for non-nullable type: 'AWSDateTime' within parent 'Blog' (/createPost/blog/createdAt)', locations='null', path='[GraphQLPathSegment{value='createPost'}, GraphQLPathSegment{value='blog'}, GraphQLPathSegment{value='createdAt'}]', extensions='null'}, GraphQLResponse.Error{message='Cannot return null for non-nullable type: 'ID' within parent 'Blog' (/createPost/blog/id)', locations='null', path='[GraphQLPathSegment{value='createPost'}, GraphQLPathSegment{value='blog'}, GraphQLPathSegment{value='id'}]', extensions='null'}, GraphQLResponse.Error{message='Cannot return null for non-nullable type: 'String' within parent 'Blog' (/createPost/blog/name)', locations='null', path='[GraphQLPathSegment{value='createPost'}, GraphQLPathSegment{value='blog'}, GraphQLPathSegment{value='name'}]', extensions='null'}, GraphQLResponse.Error{message='Cannot return null for non-nullable type: 'AWSDateTime' within parent 'Blog' (/createPost/blog/updatedAt)', locations='null', path='[GraphQLPathSegment{value='createPost'}, GraphQLPathSegment{value='blog'}, GraphQLPathSegment{value='updatedAt'}]', extensions='null'}], errors=[GraphQLResponse.Error{message='Cannot return null for non-nullable type: 'AWSTimestamp' within parent 'Blog' (/createPost/blog/_lastChangedAt)', locations='null', path='[GraphQLPathSegment{value='createPost'}, GraphQLPathSegment{value='blog'}, GraphQLPathSegment{value='_lastChangedAt'}]', extensions='null'}, GraphQLResponse.Error{message='Cannot return null for non-nullable type: 'Int' within parent 'Blog' (/createPost/blog/_version)', locations='null', path='[GraphQLPathSegment{value='createPost'}, GraphQLPathSegment{value='blog'}, GraphQLPathSegment{value='_version'}]', extensions='null'}, GraphQLResponse.Error{message='Cannot return null for non-nullable type: 'AWSDateTime' within parent 'Blog' (/createPost/blog/createdAt)', locations='null', path='[GraphQLPathSegment{value='createPost'}, GraphQLPathSegment{value='blog'}, GraphQLPathSegment{value='createdAt'}]', extensions='null'}, GraphQLResponse.Error{message='Cannot return null for non-nullable type: 'ID' within parent 'Blog' (/createPost/blog/id)', locations='null', path='[GraphQLPathSegment{value='createPost'}, GraphQLPathSegment{value='blog'}, GraphQLPathSegment{value='id'}]', extensions='null'}, GraphQLResponse.Error{message='Cannot return null for non-nullable type: 'String' within parent 'Blog' (/createPost/blog/name)', locations='null', path='[GraphQLPathSegment{value='createPost'}, GraphQLPathSegment{value='blog'}, GraphQLPathSegment{value='name'}]', extensions='null'}, GraphQLResponse.Error{message='Cannot return null for non-nullable type: 'AWSDateTime' within parent 'Blog' (/createPost/blog/updatedAt)', locations='null', path='[GraphQLPathSegment{value='createPost'}, GraphQLPathSegment{value='blog'}, GraphQLPathSegment{

[JalalFaisalRassam]

here is the link of the test repo to check if i missed any thing in the code or configuration
https://github.com/JalalFaisalRassam/amplify_test_flutter_app

[jordanvn]

Hi @JalalFaisalRassam 👋 Thanks for reaching out with this issue. I'll transfer this to the Flutter team so you can get the most relevant help.

[ekjotmultani]

Hi @JalalFaisalRassam just wanted to confirm, this is the schema you are using, correct?

type Blog @model @auth(rules: [{ allow: owner }]){
  id: ID!
  name: String!
  posts: [Post] @hasMany
}

type Post @model @auth(rules: [{ allow: owner }]){
  id: ID!
  title: String!
  blog: Blog @belongsTo
  comments: [Comment] @hasMany
}

type Comment @model @auth(rules: [{ allow: owner }]){
  id: ID!
  post: Post @belongsTo
  content: String!
}

We will take this and attempt to reproduce the issue and get back with an update