* signup() {
    const name = this.request.body.name;
    const email = this.request.body.email;
    const password = this.request.body.password;

    // validacions

    try {
      const user = yield users.add({
        name, email, password,
      });

      delete user.email;
      delete user.password;

      this.body = user;
      this.status = 200;
    } catch (error) {
      this.errors.push(error);
      this.status = 401;
    }
  },

///////

* add(params) {
    const user = params;

    if (params.password) {
      const salt = yield bcrypt.genSalt(10);
      user.password = yield bcrypt.hash(params.password, salt);
    }

    return yield knex('users').insert(user)
    .then(users => users.toJSON());
  },