add zone test-rspec

app/assets/javascripts/api/restaurant/zone.coffee

@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

app/assets/stylesheets/api/restaurant/zone.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the api/restaurant/zone controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/controllers/api/restaurant/zone_controller.rb

@@ -0,0 +1,4 @@
+class Api::Restaurant::ZoneController < ApplicationController
+  def index
+  end
+end

app/helpers/api/restaurant/zone_helper.rb

@@ -0,0 +1,2 @@
+module Api::Restaurant::ZoneHelper
+end

app/models/seat_table.rb

@@ -1,3 +1,6 @@
 class SeatTable < ApplicationRecord
   belongs_to :zone
+
+  # validations
+  validates_presence_of :name,:order_by, :created_by
 end

app/models/zone.rb

@@ -1,2 +1,7 @@
 class Zone < ApplicationRecord
+  # model association
+ has_many :seat_tables, dependent: :destroy
+
+ # validations
+ validates_presence_of :name, :created_by
 end

app/views/api/restaurant/zone/index.html.erb

@@ -0,0 +1,2 @@
+<h1>Api::Restaurant::Zone#index</h1>
+<p>Find me in app/views/api/restaurant/zone/index.html.erb</p>