todo/data/schema/mutations/RemoveTodoMutation.js

// @flow
/* graphql-relay doesn't export types, and isn't in flow-typed.  This gets too messy */
/* eslint flowtype/require-return-type: 'off' */

import {mutationWithClientMutationId, fromGlobalId} from 'graphql-relay';
import {GraphQLID, GraphQLNonNull, type GraphQLFieldConfig} from 'graphql';
import {GraphQLUser} from '../nodes';
import {getUserOrThrow, removeTodo, User} from '../../database';

type Input = {|
  +id: string,
  +userId: string,
|};

type Payload = {|
  +id: string,
  +userId: string,
|};

const RemoveTodoMutation: GraphQLFieldConfig<$FlowFixMe, $FlowFixMe> =
  mutationWithClientMutationId({
    name: 'RemoveTodo',
    inputFields: {
      id: {type: new GraphQLNonNull(GraphQLID)},
      userId: {type: new GraphQLNonNull(GraphQLID)},
    },
    outputFields: {
      deletedTodoId: {
        type: new GraphQLNonNull(GraphQLID),
        resolve: ({id}: Payload): string => id,
      },
      user: {
        type: new GraphQLNonNull(GraphQLUser),
        resolve: ({userId}: Payload): User => getUserOrThrow(userId),
      },
    },
    mutateAndGetPayload: ({id, userId}: Input): Payload => {
      const localTodoId = fromGlobalId(id).id;
      removeTodo(localTodoId);

      return {id, userId};
    },
  });

export {RemoveTodoMutation};