GraphQL Getting Started Code Fragment 7

GraphQL7.js

const User = new GraphQLObjectType({
  name: 'User',
  description: 'Represents user',
  fields: () => ({
    _id: { type: GraphQLString },
    firstName: { type: GraphQLString },
    lastName: { type: GraphQLString },
    role: { type: GraphQLString },
    skillLevels: {
      type: new GraphQLList(SkillLevel),
      description: 'Returns list of skills for certain user',
      resolve: (user) => {
        return user._level_skills.map((singleLevelSkill) => {
          return LEVEL_SKILL.findOne({ _id: singleLevelSkill }, (err, res) => {
            if (err) return err;
            return res;
          });
        });
      }
    }
  })
});