AWS GraphQL: Variable 'input' has coerced Null value for NonNull type 'Input!'

Question

I'm using ReactJS and aws-amplify to execute graphql operations.

CODE:

import {
   API,
   graphqlOperation
} from 'aws-amplify';

import { UpdateInput } from './mutations.js';

// Call mutation
const input = { /* some values */ };
API.graphql(graphqlOperation(UpdateInput, input)).then(...);

GraphQL mutation definition:

export const UpdateInput = `mutation UpdateInput($input: Input!) {
   updateInput(input: $input) {
      id, 
      name
   }   
}`

GraphQL Schema:

input Input {
   id: ID!
   name: String
}

type Mutation {
   updateInput(input: Input!): String
}

However, I get an error:

[Log] Variable 'input' has coerced Null value for NonNull type 'Input!'

Using AWS console my mutation works and input is NonNull (using a debugger)

Any ideas what's causing the error?

Joseph D. · Accepted Answer · 2019-12-10 02:35:37Z

57

The key was input in the updateInput mutation.

updateInput(input: Input!): String
         // ^^^^^ input key

Thus, need to specify correct key in the passed variable.

const variables = {
  input: someData, // key is "input" based on the mutation above
};

API.graphql(graphqlOperation(UpdateInput, variables)).then(...);

edited Dec 10, 2019 at 2:35

answered Aug 24, 2018 at 9:33

Joseph D.

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1 Comment

Adam Ryason Over a year ago

Thanks! This solution helped me figure out that I don't pass 'input' to a query, and instead I just pass 'id'.

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