Graphql-ruby: GraphQL ruby mutation using InputObject problem

[chawii]

Hi, I'm new with GraphQL ruby and I was able to make my mutation work without using the InputObject but manually defining all the arguments that I need then passing it via input: { . . . }.

I then stumbled with InputObject and seems that it is a more elegant way to implement my mutation by using the the query variables. However, I'm current stuck at it with these errors:

{
  "errors": [
    {
      "message": "Type mismatch on variable $input and argument input (UserInput! / createUserInput!)",
      "locations": [
        {
          "line": 2,
          "column": 22
        }
      ],
      "path": [
        "mutation createUser",
        "createUser",
        "input"
      ],
      "extensions": {
        "code": "variableMismatch",
        "variableName": "input",
        "typeName": "UserInput!",
        "argumentName": "input",
        "errorMessage": "Type mismatch"
      }
    }
  ]
}

Here's my mutation for creating a user.

# mutations/create_user.rb
mutation createUser($input: UserInput!) {
  createUser(input: $input) {
    firstname,
    lastname,
    email
  }
}

# query variables
{ 
     "input": {
          "firstname": "John",
      "lastname": "Doe",
      "email": "[email protected]"
       }
}

Here's my mutation/type classes:

# mutation class
module Mutations
  class CreateUser < BaseMutation
    graphql_name "createUser"

    argument :input, ProviderBff::Types::UserInput, required: true

    # return type from mutation
    type ProviderBff::Types::UserType

    def resolve(input:)
      # . . . rest of the codes
    end
  end
end

# InputType
module Types
    class UserInput < BaseInputObject
          graphql_name 'UserInput'

      argument :firstname, String, required: true
      argument :lastname, String, required: true
      argument :email, String, required: true
    end
  end

module Types
    class UserType < BaseObject
      graphql_name 'UserType'

      field :firstname, String, null: false
      field :lastname, String, null: false
      field :email, String, null: false
    end
  end

What seems to be the problem here?

[rmosolgo]

Does your BaseMutation extend GraphQL::Schema::RelayClassicMutation?

If it does, change it to extend GraphQL::Schema::Mutation instead.

(RelayClassicMutation inserts an automatically-generated input: argument to your configured mutation. It looks like you're defining input: manually, so you don't need that generated argument. In fact, the generated argument is _getting in your way_!)

[chawii]

Does your BaseMutation extend GraphQL::Schema::RelayClassicMutation?

If it does, change it to extend GraphQL::Schema::Mutation instead.

(RelayClassicMutation inserts an automatically-generated input: argument to your configured mutation. It looks like you're defining input: manually, so you don't need that generated argument. In fact, the generated argument is _getting in your way_!)

Hi @rmosolgo, thank you for the quick response. Yes, the BaseMutation do extend the GraphQL::Schema::RelayClassicMutation.

I see, will try to remove the manual input: and will get back to you. Thanks

[chawii]

Hi @rmosolgo, tried to go deeper to understand it and it seems that everything is auto-generated when using RelayClassicMutation unless you supply a new value for them.

Anyway, I updated my mutation class to this

module Mutations
    class CreateUser < GraphQL::Schema::RelayClassicMutation

      # return type from mutation
      type Types::CreateUserType

      def resolve
        # rest of codes
      end
    end
  end

Looks like I'm getting there. However, I'm getting this error now:

{
  "errors": [
    {
      "message": "Variable $input of type CreateUserInput! was provided invalid value",
      "locations": [
        {
          "line": 1,
          "column": 29
        }
      ],
      "extensions": {
        "value": null,
        "problems": [
          {
            "path": [],
            "explanation": "Expected value to not be null"
          }
        ]
      }
    }
  ]
}

There are no null values within my query variables so why is it raising this error?

[rmosolgo]

Could you please share the query string that you tried when you got that error?

[chawii]

Here's the query string @rmosolgo.

"{\"query\":\"mutation createUser($input: CreateUserInput!) {\\n createUser(input: $input) {\\n firstname,\\n lastname,\\n email\\n }\\n}\",\"variables\":{\"input\":{\"firstname\":\"fname\",\"lastname\":\"lname\",\"email\":\"[email protected]\"}},\"operationName\":\"createUser\"}"

[rmosolgo]

Hm... that seems like it should work! Are you passing variables: params[:variables] in your GraphqlController? Could you share that code, please?

[chawii]

Hi @rmosolgo, thank you for responding quickly, really appreciated it. By the way this is not a Ruby on Rails project so we're not using any controllers, it's outside of rails so we're just using graphql-ruby gem.

[rmosolgo]

Ok, then please share the code wherever you're calling .execute(...) to execute the GraphQL query. I want to check that variables are being given correctly.

(The values in your example _should_ work, so I wonder if they're not being passed to .execute(...) correctly.)

[chawii]

Hi again @rmosolgo, upon checking what's calling the .execute(..) seems that the variables aren't being passed to it. It's working perfectly now! :)

Thank you so much for assisting me. Will close this now!

Cheers!