Trigger Appsync mutation from lambda function

Question

I keep getting this error message when I try to trigger a mutation through lambda when I add/modify/delete items from DynamoDB:

"message" : "Invalid request, query can't be null.",

So what I am trying to do is whenever a modification is done directly on dynamodb, the subscribed users will be notified with the changes.

I have created the new mutation with None type data source. I tested it out directly on the query console and it works fine.

I have also created the lambda function based on Python that is able to retrieve the dynamodb streams and has tested it out with cloudwatch.

Now the issue is when I try to do a HTTP post request from the lambda, i get:

error: MalformedHttpRequestException

message: invalid request, query can't be null.

name of mutation: addTodo

the data i am sending over post:

{'operationName': 'addTodo',
   'variables':{'id': '400',
                'name': 'some name', 
                'description': 'some description',
                'query': 'mutation addTodo($id: ID,
                                           $name: String,
                                           $description: String)
                 {addTodo(id: $id,
                          name: $name,
                          description: $description)
                  {id name description}}'
                }
}

Ben · Accepted Answer · 2020-05-09 09:33:38Z

2

You have query inside variables in your payload but it's expected to be passed outside like this:

{
    'operationName': 'addTodo',
    'variables': {
        'id': '400',
        'name': 'some name',
        'description': 'some description'
    },
    'query': 'mutation addTodo(...'
}

answered May 9, 2020 at 9:33

Ben

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1 Comment

TheArchitecta Over a year ago

Agreed, but the documentation still has it setup incorrectly. docs.amplify.aws/guides/functions/graphql-from-lambda/q/…

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