User for repository using knex query building

userRepository.js

const { execQuery } = require('../../support/wrapQuery')
const { filterBy, insertBy } = require('../../support/wrapRepository')
const knex = require('../../config/db')
const query = knex('users')

const filterUserByUsername = (req) => {
  const filterByUsername = filterBy('username', req.body.username)
  return execQuery(filterByUsername, query)
    .then(result => {
      console.log(' result ' + resul)
      console.log(' resul ob ' + JSON.stringify(resul))
      return result
    }).catch(err => {
      return err
    })
}

const insertUser = (req) => {
  const userCreated = insertBy(req.body)
  console.log(' userCreated ' + userCreated)
  return execQuery(userCreated, query)
}

module.exports = { filterUserByUsername, insertUser }

userService.js

const Boom = require('boom')
const { filterUserByUsername, insertUser } = require('./userRepository')
const { isEmpty } = require('lodash')

const createUser = (req, reply) => {
  // error here, object users is every [Object Promise], why ??
  // must be the result of the query filterUserByUsername(req) and not [Object Promise]
  const users = filterUserByUsername(req)
  console.log(' exists user stringfy ' + JSON.stringify(users))
  console.log(' exists usr ' + users)
  if (!isEmpty(users)) {
    reply.send(Boom.conflict('user already exists'))
  }
  if (isEmpty(users)) {
    console.log(' is rejected create ' + users.isRejected())
    const userCreated = insertUser(req)
    reply.send({ message: 'user created', data: userCreated }).code(201)
  }
}

module.exports = createUser

wrapQuery.js

const execQuery = (fn, query) => {
  return fn(query)
    .then(result => {
      return result
    }).catch(err => {
      return err
    })
}

module.exports = { execQuery }

wrapRepository.js

const filterBy = (field, param) => {
  return (query) => {
    return query.where(field, param)
  }
}

const insertBy = (domain) => {
  return (query) => {
    return query.insert(domain)
  }
}

module.exports = { filterBy, insertBy }