GraphQL Getting Started Code Fragment 8

GraphQL8.js

const Skill = new GraphQLObjectType({
  name: 'Skill',
  description: 'Represents skill',
  fields: () => ({
    _id: { type: GraphQLString },
    name: { type: GraphQLString },
    skillLevels: {
      type: new GraphQLList(SkillLevel),
      description: 'Returns list of levels corrsponding to the skill. It is similar to list of grades for a certain subject in school',
      resolve: (skill) => {
        return skill._level_skills.map((singleLevelSkill) => {
          return LEVEL_SKILL.findOne({ _id: singleLevelSkill }, (err, res) => {
            if (err) return err;
            return res;
          });
        });
      }
    }
  })
});