Table with count method react Cheat Sheet

Rails.application.routes.draw do
  resources :dogs
end

class CreateDogs < ActiveRecord::Migration[5.2]
  def change
    create_table :dogs do |t|
      t.string :name
      t.string :motto
      
      t.timestamps
    end
  end
end

Dog.create(name: 'Nala', motto: 'Born to be wild')
Dog.create(name: 'Alex', motto: 'Calm as can be')
Dog.create(name: 'Leroy', motto: 'Life of the pawty')
Dog.create(name: 'Belle', motto: 'Miss Independent')

1.**config/routes.rb**
Rails.application.routes.draw do
  resources :barangs
end

2.**db/migrate/20190510051736_create_barangs.rb**
class CreateBarangs < ActiveRecord::Migration[5.2]
  def change
    create_table :barangs do |t|
      t.string :sku
      t.string :nama
      t.integer :kuantitas
      t.integer :hargaBeli
      t.integer :hargaJual
      t.integer :profit

      t.timestamps
    end
  end
end

3.**db/seeds.rb**
Barang.create(sku:'AIR001', nama: 'Air mineral Aqui', kuantitas:10, hargaBeli: 3000, hargaJual: 6000, profit: 3000)
Barang.create(sku:'SOF001', nama: 'Choca Chola', kuantitas:20, hargaBeli: 5000, hargaJual: 4500, profit: -500)
Barang.create(sku:'SNK001', nama: 'Cheetah Toh', kuantitas:15, hargaBeli: 4000, hargaJual: 5000, profit:1000)

**Goal: List all dogs**

**Controller** — app/controllers/dogs_controller.rb, index method
def index
   @dogs = Dog.all
end

**Index** — views/dogs/index.html.erb
<ul>
  <% @dogs.each do |dog| %>
    <li><%= link_to dog.name, dog_path(dog)  %></li>
  <% end %>
</ul>

**Goal**: Show details of specific dog

**Controller **— app/controllers/dogs_controller.rb, show method 
 def show
    @dog = Dog.find(params[:id])
  end


**Show** — views/dogs/show.html.erb
<h1><%= @dog.name %></h1>
<h4>"<%= @dog.motto %>"</h4>

4.**app/controllers/barangs_controller.rb**
class BarangsController < ApplicationController
  def index
    @barangs = Barang.all    
 end

  def show
    @barangs = Barang.find(params[:id])
  end

  def new
    @barangs = Barang.new
    @hasilProfit = MathCalculator.send(params[:operation], *[params[:a], params[;b]])
    render : index
  end

  def create
    @barang = Barang.create(barang_params)

    redirect_to barangs_path
  end

  def barang_params
    params.require(:barang).permit(:sku, :nama, :kuantitas, :hargaBeli, :hargaJual, :profit)
  end

  def edit
    @barang = Barang.find(params[:id])
  end

  def destroy
    @barang = Barang.find(params[:id])
    @barang.destroy

    redirect_to barangs_path
  end

  def update
    @barang = Barang.find(params[:id])
    @barang.update(barang_params)

    redirect_to barangs_path
  end

  def get_profit 
    count_profit = ProfitCalculator.new params[:operation]
    @result = profit_calculator.calculate
  end
end

5.**app/views/barangs/index.html.erb**
<style>
    table{
    margin-left: auto;
    margin-right: auto;
    }
    .tabel2 {
    border-collapse: collapse;
    }

    .tabel2, tr, th, td {
    border: 1px solid black;
    }

</style>

<h1>Daftar Barang</h1>


<table class='tabel2'>
<thead>
<tr>
<th>SKU</th>
<th>Nama</th>
<th>Kuantitas </th>
<th>Harga beli</th>
<th>Harga jual</th>
<th>Profit per item</th>
<th colspan="2">Action</th>

</tr>
</thead>
<tbody>

<% @barangs.each do |barang| %>
<tr>
<td scope="row"><%= barang.sku %></td>
<td><%= barang.nama%></td>
<td><%= barang.kuantitas  %></td>
<td><%= barang.hargaBeli %></td>
<td><%= barang.hargaJual  %></td>%
<td>
    <% unless @hasilProfit.nil?  %>
    <%= @hasilProfit %>
    <% end %>
</td>
<td><%= button_to 'Edit', edit_barang_path(barang), method: 'get'%></td>
<td><%= button_to 'Remove', barang_path(barang), method: 'delete', data: { confirm: 'Anda Yakin?' } %></td>
</tr>
<% end %>
</tbody>
</table>
<%= link_to "Add a New Barang", new_barang_path %>

6.*app/views/barangs/edit.html.erb**
<h1>Edit Barang</h1>


<h3>Update Barang Details</h3>
<%= form_with model: @barang do |form| %>
  <%= form.text_field :sku, placeholder: "sku" %>
  <%= form.text_field :nama, placeholder: "nama" %>
  <%= form.number_field :kuantitas,  placeholder: "kuantitas" %>
  <%= form.number_field :hargaBeli,  placeholder: "hargaBeli" %>
  <%= form.number_field :hargaJual,  placeholder: "hargaJual" %>
  <%= form.number_field :profit,  placeholder: "profit" %>

  <%= form.submit %>
<% end %>

**Goal**: Create a new dog

**Controller** — app/controllers/dogs_controller.rb, new and create methods 
def new
    @dog = Dog.new
  end

  def create
    dog = Dog.create(dog_params)

    redirect_to dogs_path
  end

  private

  def dog_params
    params.require(:dog).permit(:name, :motto)
  end


**New** — views/dogs/new.html.erb
<h3>Create a Dog</h3>
<%= form_with model: @dog do |form| %>
  <%= form.text_field :name, placeholder: "name" %>
  <%= form.text_field :motto, placeholder: "motto" %>

  <%= form.submit %>
<% end %>

**Goal** Update details for specific dog
**Controller** — app/controllers/dogs_controller.rb, edit and update methods 
  def edit
    @dog = Dog.find(params[:id])
  end

  def update
    @dog = Dog.find(params[:id])
    @dog.update(dog_params)

    redirect_to dog_path(@dog)
  end

  private

  def dog_params
    params.require(:dog).permit(:name, :motto)
  end


**Edit** — views/dogs/edit.html.erb
<h3>Update Dog Details</h3>
<%= form_with model: @dog do |form| %>
  <%= form.text_field :name, placeholder: "name" %>
  <%= form.text_field :motto, placeholder: "motto" %>

  <%= form.submit %>
<% end %>

**Goal**: Remove a dog from the database
**Controller **— app/controllers/dogs_controller.rb, destroy method


  def destroy
    @dog = Dog.find(params[:id])
    @dog.destroy

    redirect_to dogs_path
  end

**Show** — views/dogs/show.html.erb
<%= link_to 'Remove', @dog, method: :delete, data: { confirm: 'Are you sure?' } %>

7.**app/views/barangs/new.html.erb**
<h1>Buat Data Barang</h1>


<h3>Create Barang</h3>
<%= form_with model: @barangs do |form| %>
  <%= form.text_field :sku, placeholder: "sku" %>
  <%= form.text_field :nama, placeholder: "nama" %>
  <%= form.number_field :kuantitas, placeholder: "kuantitas" %>
  <%= form.number_field :hargaBeli, placeholder: "hargaBeli" %>
  <%= form.number_field :hargaJual, placeholder: "hargaJual" %>
  <%= form.number_field :profit, placeholder: "profit" %>

  <%= form.submit %>
<% end %>

8.**app/views/barangs/show.html.erb**
<h1>Lihat Barang</h1>

<h1><%= @barangs.sku %></h1>
<h4><%= @barangs.nama %></h4>
<h4><%= @barangs.kuantitas %></h4>
<h4><%= @barangs.hargaBeli %></h4>
<h4><%= @barangs.hargaJual %></h4>
<h4><%= @barangs.profit %></h4>

9.**lib/math_calculator.rb**
class MathCalculator
    def calculateProfit(a, b)
      # whatever you need to do here
      a.to_i - b.to_i
    end
  end