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Create Visitor model

$ bin/rails g model visitor family_name:string given_name:string
$ bin/rails db:migrate

Edit app/models/visitor.rb:

class Visitor < ApplicationRecord
  validates :family_name, :given_name, presence: true
end

---

$ bin/rails g controller api/visitors

Edit config/routes.rb:

Rails.application.routes.draw do
  root 'top#index'

  namespace :api do
    resources :visitors, only: [ :create ]
  end
end

---

Edit app/controllers/api/visitors_controller.rb:

class Api::VisitorsController < ApplicationController
  def create
    @visitor = Visitor.new(visitor_params)
    if @visitor.save
      render json: { result: 'Success' }
    else
      render action: 'errors', format: 'json'
    end
  end

  private
  def visitor_params
    params.require(:visitor).permit(:family_name, :given_name)
  end
end

$ touch app/views/visitors/errors.jbuilder

Add these lines to app/views/visitors/errors.jbuilder

json.errors do
  @visitor.errors.keys.each do |key|
    json.set! key do
      json.array! @visitor.errors.full_messages_for(key)
    end
  end
end

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