cat index page

app/assets/javascripts/cats.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/cats.scss

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

app/controllers/cats_controller.rb

@@ -0,0 +1,5 @@
+class CatsController < ApplicationController
+  def index
+    @cats = Cat.all 
+  end
+end

app/helpers/cats_helper.rb

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+module CatsHelper
+end

app/models/cat.rb

@@ -0,0 +1,11 @@
+class Cat < ApplicationRecord
+
+  validates :name, :age, presence: true
+  validates :name, uniqueness: true
+  validates :age, inclusion: { in: (1..10) }
+  validates :color, inclusion: { in: ["brown", "tiger", "black", "white", "pink"] }, allow_nil: true
+  validates :owner, presence: true
+  validates :owner, length: { minimum: 3 }
+  validates :food, exclusion: { in: ["pineapple", "beer", "chocolate", "wine", "butter"] }
+
+end

app/views/cats/index.html.erb

@@ -0,0 +1,10 @@
+<ol>
+  <%- @cats.each do |cat| %>
+    <li>
+      <strong><%= cat.name %>,</strong>
+      <span><%= cat.age %>,</span>
+      <span><%= cat.color %>,</span>
+      <span><%= cat.food %></span>
+    </li>
+  <%- end %>
+</ol>

config/routes.rb

@@ -1,3 +1,4 @@
 Rails.application.routes.draw do
   # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
+  resources :cats
 end

db/migrate/20200114183254_create_cats.rb

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+class CreateCats < ActiveRecord::Migration[5.2]
+  def change
+    create_table :cats do |t|
+      t.string :name
+      t.integer :age
+      t.string :color
+      t.text :food
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20200205190411_add_owner_to_cats.rb

@@ -0,0 +1,5 @@
+class AddOwnerToCats < ActiveRecord::Migration[5.2]
+  def change
+    add_column :cats, :owner, :string
+  end
+end

db/schema.rb

@@ -0,0 +1,25 @@
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 2020_02_05_190411) do
+
+  create_table "cats", force: :cascade do |t|
+    t.string "name"
+    t.integer "age"
+    t.string "color"
+    t.text "food"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.string "owner"
+  end
+
+end

test/controllers/cats_controller_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class CatsControllerTest < ActionDispatch::IntegrationTest
+  # test "the truth" do
+  #   assert true
+  # end
+end

test/models/cat_test.rb

@@ -0,0 +1,31 @@
+
+require 'test_helper'
+
+class CatTest < ActiveSupport::TestCase
+
+  test "should not save cat without name" do
+    cat = Cat.new(owner:'gloria', age: 8)
+    assert_not cat.save
+  end
+
+  test "should not save cat without age" do
+    cat = Cat.new(name:'m', owner:'gloria')
+    assert_not cat.save
+  end
+
+  test "should not save cat if the color is blue" do
+    cat = Cat.new(name:'n', age: 8, owner:'gloria', color:'blue')
+    assert_not cat.save
+  end
+
+  test "should not save cat without owner" do
+    cat = Cat.new(name:'o', age: 8)
+    assert_not cat.save
+  end
+
+  test "should not save cat with an owner without 3 charaters" do
+    cat = Cat.new(name:'p', age: 8, owner:'mi')
+    assert_not cat.save
+  end
+
+end