meowtown skeleton

cat.rb

class Cat < ActiveRecord::Base

  validates :name, presence: true
  validates :life_story, presence: true
  validates :image_url, presence: true

  def lose_a_life!
    if self.lives > 1
      self.lives -= 1
      self.save
    else 
      self.destroy
    end
  end

end

cat_spec.rb

require 'rails_helper'

RSpec.describe Cat, type: :model do

  let(:healthy_cat) { create(:cat) }
  let(:almost_dead_cat) { create(:cat_with_1_life) }

  describe "fields" do
    it { should have_db_column(:name).of_type(:string) }
    it { should have_db_column(:life_story).of_type(:text) }
    it { should have_db_column(:image_url).of_type(:string) }
    it { should have_db_column(:lives).of_type(:integer).with_options(default: 9) }
  end

  describe "validations" do
    it { should validate_presence_of(:name) }
    it { should validate_presence_of(:life_story) }
    it { should validate_presence_of(:image_url) }
  end

  describe "methods" do

    describe "#lose_a_life!" do

      context "if cat has more than 1 life remaining" do

      it "decrements the cat's lives by 1" do
          healthy_cat.lose_a_life!
          expect(healthy_cat.lives).to eq(8)
      end

      end

      context "if cat has 1 life remaining" do

      it "removes the cat from the database" do
          almost_dead_cat.lose_a_life!
          expect(Cat.find_by_name(almost_dead_cat.name)).to be_nil
      end

      end

    end

  end

end

cats_controller.rb

class CatsController < ApplicationController

  def index
    @cats = Cat.all
  end

  def show
    @cat = Cat.find(params[:id])
    @cat.lose_a_life!
  end

  def new
    @cat = Cat.new
  end

  def create
    @cat = Cat.new(cat_params)
    if @cat.save
      redirect_to @cat
    else
      render 'new', status: 400
    end
  end

  def edit
    @cat = Cat.find(params[:id])
  end

  def update
    @cat = Cat.find(params[:id])
    if @cat.update(cat_params)
      redirect_to @cat
    else
      render 'edit', status: 400
    end
  end

  private

    def cat_params
      params.require(:cat).permit(:name, :life_story, :image_url)
    end

end

cats_controller_spec.rb

require 'rails_helper'

RSpec.describe CatsController, type: :controller do

  describe "#index" do

    before do 
      5.times { Cat.create(attributes_for(:cat)) }
      get :index
    end

    it { should respond_with(200) }
    it { should render_template(:index) }
    it "should assign @cats to all Cats in DB" do
      expect(assigns(:cats)).to eq(Cat.all)
    end

  end

  describe "#show" do

    before do
      @cat = Cat.create(attributes_for(:cat))
      allow(@cat).to receive(:lose_a_life!)
      get :show, id: @cat.id
    end

    it { should respond_with(200) }
    it { should render_template(:show) }
    it "should assign cat with specified id to @cat" do
      expect(assigns(:cat)).to eq(@cat)
    end
    it "should call cat's #lose_a_life! method" do
      @cat.reload
      expect(@cat.lives).to eq(8)
    end

  end

  describe "#new" do

    before do
      get :new
    end

    it { should respond_with(200) }
    it { should render_template(:new) }
    it "should assign an instance of Cat to @cat" do
      expect(assigns(:cat)).to be_a(Cat)
    end

  end

  describe "#create" do

    context "if valid params" do

      before do
        @cat_params = attributes_for(:cat)
        post :create, { cat: @cat_params }
      end

      it { should respond_with(302) }
      it "should redirect to the new cat's page" do
        cat = Cat.find_by(@cat_params)
        expect(response).to redirect_to("/cats/#{cat.id}")
      end
      it "creates a new cat with specified params" do
        expect(Cat.find_by(@valid_params)).to be_truthy
      end

    end

    context "if invalid params" do

      before do 
        post :create, { cat: {name: "test"} }
      end

      it { should respond_with(400) }
      it { should render_template(:new) }
      it "should not create a new cat" do
        expect(Cat.find_by_name("test")).to be_nil
      end

    end

  end

  describe "#edit" do

    before do
      @cat = create(:cat)
      get :edit, id: @cat.id
    end

    it { should respond_with(200) }
    it { should render_template(:edit) }
    it "should assign cat with specified id to @cat" do
      expect(assigns(:cat)).to eq(@cat)
    end

  end

  describe "#update" do

    context "with valid params" do

      before do
        @cat = create(:cat)
        @cat_params = attributes_for(:cat)
        patch :update, { id: @cat.id, cat: @cat_params }
      end

      it { should respond_with(302) }
      it { should redirect_to("/cats/#{@cat.id}")}
      it "should update the attributes for cat" do
        expect(Cat.find_by(@cat_params)).to be_truthy
      end

    end
    
    context "with invalid params" do

      before do
        @cat = create(:cat)
        @invalid_cat_params = { name: "", life_story: "", image_url: "" }
        patch :update, { id: @cat.id, cat: @invalid_cat_params }
      end

      it { should respond_with(400) }
      it { should render_template(:edit) }
      it "should not update the attributes for cat" do
        expect(Cat.find_by(@invalid_cat_params)).to be_nil
      end

    end

  end

end

edit.html.erb

<h1>edit a cat</h1>

<% if @cat.errors.any? %>
    <ul>
      <% @cat.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
    </ul>
<% end %>

<%= form_for :cat, url: cat_path(@cat), method: :patch do |f| %>
  <p>
    <%= f.label :name %><br>
    <%= f.text_field :name %>
  </p>
  <p>
    <%= f.label :life_story %><br>
    <%= f.text_area :life_story %>
  </p>
  <p>
    <%= f.label :image_url %><br>
    <%= f.text_field :image_url %>
  </p>
  <p>
    <%= f.submit %>
  </p>
<% end %>

<%= link_to('back', cats_path) %>

gistfile1.txt

# spec/factories/cat.rb

FactoryGirl.define do

  factory :cat do 

    name Faker::Name.name 
    life_story Faker::Lorem.paragraph 
    image_url Faker::Avatar.image

    factory :cat_with_1_life do
      lives 1
    end

  end

end

index.html.erb

<h1>meowtown</h1>
<%= link_to('make a new cat', new_cat_path) %>
<ul>
  <% @cats.each do |cat| %>
    <li>
      <h2><%= cat.name %></h2>
      <img src='<%=cat.image_url%>' />
      <p>lives left: <%= cat.lives %></p>
      <%= link_to('show this cat', cat_path(cat)) %>
    </li>
  <% end %>
</ul>

new.html.erb

<h1>create a cat</h1>

<% if @cat.errors.any? %>
    <ul>
      <% @cat.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
    </ul>
<% end %>

<%= form_for :cat, url: cats_path do |f| %>
  <p>
    <%= f.label :name %><br>
    <%= f.text_field :name %>
  </p>
  <p>
    <%= f.label :life_story %><br>
    <%= f.text_area :life_story %>
  </p>
  <p>
    <%= f.label :image_url %><br>
    <%= f.text_field :image_url %>
  </p>
  <p>
    <%= f.submit %>
  </p>
<% end %>

<%= link_to('back', cats_path) %>

show.html.erb

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

<img src='<%= @cat.image_url %>' />

<h2>Life Story:</h2>

<p><%= @cat.life_story %></p>

<%= link_to('edit this cat', edit_cat_path(@cat)) %>

<%= link_to('back', cats_path) %>