Strong parameters with grape

strong_params_helpers.rb

module StrongParamsHelpers
  extend Grape::API::Helpers

  def permitted_params
    @permitted_params ||= declared(params, include_missing: false, include_parent_namespaces: false)
  end
end

users.rb

module V1
  class Users < Grape::API
    helpers StrongParamsHelpers
    
    resource :users do
      desc 'Create a new user'
      params do
        requires :user, type: Hash do
          requires :last_name, type: String, desc: 'Last name'
          requires :first_name, type: String, desc: 'First name'
          requires :email, type: String, desc: 'Email address'
          requires :phone, type: String, desc: 'Phone number'
          requires :password, type: String, desc: 'Password'
        end
      end
      post do
        can_be_here? User
        @user = User.new permitted_params[:user]
        @user.save!
        @user
      end
    end
  end
end

@MohdAnas
Managed to update via self.assign_attributes:

def update_credentials(params)
    self.assign_attributes(whitelist_params(params, attributes.keys))
    self.save!
end

def whitelist_params(params, attrs)
    whitelisted = {}
    attrs.each do |attr|
      whitelisted[attr.to_sym] = params[attr] if params[attr]
    end

   whitelisted
end