Cannot return null for non-nullable type graphql

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, , , ,
1

I get the following error when i query allTodos index through graphql

"errors": [
    {
      "message": "Cannot return null for non-nullable type (line 4, column 7):\n      todo\n      ^",
      "path": [
        "allTodos",
        "data",
        0,
        "todo"
      ],
      "locations": [
        {
          "line": 4,
          "column": 7
        }
      ]
    },

My schema

enum Priority {
  P1
  P2
  P3
  P4
}

type Todo @embedded {
  todo: String!
  description: String!
  status: Boolean!
  date: String!
  priority: Priority
  uid: ID!
  subtodos: [Todo!]
  comments: [String!]
  reminders: [String!]
}

input TodoInput {
  todo: String!
  description: String!
  status: Boolean!
  date: String!
  priority: Priority
  uid: ID!
  subtodos: [TodoInput!]
  comments: [String!]
  reminders: [String!]
}

type Query {
  allTodos: [Todo!]!
  findTodoByUid(uid: ID!): Todo!
}

type Mutation {
  createSubTodo(parentId: ID!, newData: TodoInput!): Todo!
    @resolver(name: "create_sub_todo")
}

this is how I am quering in graphql

{
   allTodos {
    data {
      todo
    }
  }
}
2

Did you intend to have @embedded directive?

3

yes,
As i have UDfs that return type Todo.

4

Remove the @embedded should be a part of type. Here is more info and examples on how to use it.

5

no, It didn’t solved my problem.

6

@umer2001 Can you share your latest schema file and query that is failing?

7

@Jay-Fauna yeah sure
schema file,

enum Priority {
  P1
  P2
  P3
  P4
}

type Todo @embedded {
  todo: String!
  description: String!
  status: Boolean!
  date: String!
  priority: Priority
  uid: ID!
  subtodos: [Todo!]
  comments: [String!]
  reminders: [String!]
}

input TodoInput {
  todo: String!
  description: String!
  status: Boolean!
  date: String!
  priority: Priority
  uid: ID!
  subtodos: [TodoInput!]
  comments: [String!]
  reminders: [String!]
}

type Query {
  allTodos: [Todo!]!
  findTodoByUid(uid: ID!): Todo!
}

type Mutation {
  createSubTodo(parentId: ID!, newData: TodoInput!): Todo!
    @resolver(name: "create_sub_todo")
}

Query

{
  allTodos {
    data {
      todo
    }
  }
}
8

I still see type Todo @embedded. It should be just type Todo.

type Todo {
    todo: String!
    description: String!
    status: Boolean!
    date: String!
    priority: Priority
    uid: ID!
    subtodos: [Todo!]
    comments: [String!]
    reminders: [String!]
}

I removed that and was able to import the schema and run the query.

image
image908×285 16.1 KB

Few other observations in your schema file.

  1. You don’t need findTodoByUid(uid: ID!): Todo! as Fauna by default provides you findTodoByID(id: ID!): Todo
  2. You don’t need input TodoInput as Fauna creates an InputType for every type by default.
9

@Jay-Fauna did you added an new document to test?
because today I deleted all the documents and ran the query and it was sucessful with no error after that I created a document from graphql playground, the document was created but returned with some sort of error after that I queried again and same error displayed as above…

Unfortunatly, I don’t remember the error which was recived in response of document creation & and cant’t get that aain as Lastly I tred to overide schema from UI that returned with the error “Error overriding GraphQL schema.
Instance data is not valid.”
Now I can’t do anything. :pensive:

10

@umer2001 your database seems to be corrupted. Can you please reimport your schema into a new database?

11

@Jay-Fauna today I also tried to make new db and import schema in it but same error “RESPONSE:
Instance data is not valid.”
my schema

enum Priority {
  P1
  P2
  P3
  P4
}

type Todo @embedded {
  todo: String!
  description: String!
  status: Boolean!
  date: String!
  priority: Priority
  uid: ID!
  subtodos: [Todo!]
  comments: [String!]
  reminders: [String!]
}

input TodoInput {
  todo: String!
  description: String!
  status: Boolean!
  date: String!
  priority: Priority
  uid: ID!
  subtodos: [TodoInput!]
  comments: [String!]
  reminders: [String!]
}

type Query {
  allTodos: [Todo!]!
  findTodoByUid(uid: ID!): Todo!
}

type Mutation {
  createSubTodo(parentId: ID!, newData: TodoInput!): Todo!
    @resolver(name: "create_sub_todo")
}
12

@umer2001 In your schema file, please update

type Todo @embedded {
to
type Todo {

13

@Jay-Fauna Thankyou veery much now it is working fine…
It means my first database was curropted and @embedded keyword was causing the error in New database.