20201110082046_create_restaurants.rb

class CreateRestaurants < ActiveRecord::Migration[6.0]
  def change
    create_table :restaurants do |t|
      t.string :name
      t.string :address
      t.integer :rating

      t.timestamps
    end
  end
end

edit.html.erb

<%= form_for(@restaurant) do |f| %>
 <%= f.label :name %>
 <%= f.text_field :name %>
 <br>
 <%= f.label :address %>
 <%= f.text_field :address, class: "my_class" %>
 <br>
 <%= f.label :rating %>
 <%= f.number_field :rating %>
 <br>
 <%= f.submit %>
<% end %>

index.html.erb

<h1>Simple Yelp</h1>


<ul>
  <% @restaurants.each do |restaurant| %>
    <li>
      <%= link_to restaurant.name, restaurant_path(restaurant) %>
       <%= link_to "🗑", restaurant_path(restaurant), method: :delete %>
    </li>
  <% end %>
</ul>

new.html.erb

<%= form_for(@restaurant) do |f| %>
 <%= f.label :name %>
 <%= f.text_field :name %>
 <br>
 <%= f.label :address %>
 <%= f.text_field :address, class: "my_class" %>
 <br>
 <%= f.label :rating %>
 <%= f.number_field :rating %>
 <br>
 <%= f.submit %>
<% end %>

restaurant.rb

class Restaurant < ApplicationRecord
end

restaurants_controller.rb

class RestaurantsController < ApplicationController
  def index
    # Get all restaurants from DB
    @restaurants = Restaurant.all
  end

  def show
    @restaurant = Restaurant.find(params[:id])
  end

  # Build an empty form
  def new
    @restaurant = Restaurant.new # empty object
  end

  # Where we actually create
  def create
   @restaurant = Restaurant.create(restaurant_params)
   redirect_to restaurants_path
  end

  # Build an empty form for EDITING
  def edit
    @restaurant = Restaurant.find(params[:id])
  end

  #  Where we actually update
  def update
    @restaurant = Restaurant.find(params[:id])
    @restaurant.update(restaurant_params)
    redirect_to restaurant_path(@restaurant)
  end

  def destroy
    @restaurant = Restaurant.find(params[:id])
    @restaurant.destroy
    redirect_to restaurants_path
  end

  private

  # Strong parameters
  def restaurant_params
    # Forbidden object 👇
    params.require(:restaurant).permit(:name, :address, :rating)
    # Object with permitted fields 👉
  end
end

routes.rb

Rails.application.routes.draw do
  # #  1. GET /restaurants
  # get "restaurants", to: "restaurants#index", as: :restaurants

  # # GET /restaurants/new to give user a form
  # get "restaurants/new", to: "restaurants#new", as: :new_restaurant

  # #  GET /restaurants/1 (2, 3, 456...)
  # get "restaurants/:id", to: "restaurants#show", as: :restaurant

  # # POST /restaurants
  # post "restaurants", to: "restaurants#create"

  # # GET /restaurants/:id/edit to give user an edit form
  # get "restaurants/:id/edit", to: "restaurants#edit", as: :edit_restaurant

  # # PATCH/PUT /restaurants/:id
  # patch "restaurants/:id", to: "restaurants#update"

  # # DELETE /restaurants/:id
  # delete "restaurants/:id", to: "restaurants#destroy"

  resources :restaurants
end

show.html.erb

<h1> <%= @restaurant.name %> </h1>

<p>
  Located at <%= @restaurant.address %>,
  rated at <%= @restaurant.rating %> stars
</p>