Episode 6 Half-Eagle

db/migrate/001_create_vehicles.rb

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+class CreateVehicles < ActiveRecord::Migration
+	def change
+
+		create_table :vehicles do |t|
+			t.text :color
+			t.text :make
+			t.text :model
+			t.integer :year
+		end
+	end
+end

models/automobile.rb

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+class Vehicle < ActiveRecord::Base
+
+	def self.count
+		self.all.length
+	end
+
+	def self.count_blue_hondas
+		blue_hondas = self.all.count {|vehicle| vehicle.make == "Honda"; vehicle.color == "blue"; vehicle.model == "Accord"}
+	end
+
+end
+
+
+class Automobile < Vehicle
+
+	@number_of_wheels = 4
+
+	class << self
+		attr_reader :number_of_wheels
+		attr_reader :vehicles_made
+	end
+
+end
+
+
+class Motorcycle < Automobile
+	@number_of_wheels = 2
+
+	class << self
+		attr_reader :number_of_wheels
+	end
+end

spec/automobile_spec.rb

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+require 'rspec'
+require 'bundler/setup'
+require_relative '../db/setup'
+require_relative "../models/automobile"
+
+describe Automobile do
+
+	let!(:car) {Automobile.new(color: "blue", make: "Honda", model: "S2000", year: 2001)}
+
+	it "should have color" do
+		car.color.should eq("blue")
+	end
+
+	it "should have a make" do
+		car.make.should eq("Honda")
+	end
+
+	it "should have a model" do
+		car.model.should eq("S2000")
+	end
+
+	it "should have a year" do 
+		car.year.should eq(2001)
+	end
+
+	it "should be able to change attributes" do
+		car.color = "green"
+		car.color.should eq("green")
+	end
+
+	it "should have four wheels" do
+		Automobile.number_of_wheels.should eq(4)
+	end
+
+end
+
+
+describe Motorcycle do
+
+	it "should override the number of wheels" do
+		Motorcycle.number_of_wheels.should eq(2)
+	end
+
+end
+
+
+describe Vehicle do
+	Vehicle.create(color: "gray", make: "USN", model: "Ballistic Sub", year: 2008)
+	Vehicle.create(color: "while", make: "NASA", model: "SATURN V", year: 1969)
+	Vehicle.create(color: "blue", make: "Honda", model: "CR-V", year: 1999)
+	Vehicle.create(color: "blue", make: "Honda", model: "Accord", year: 2009)
+
+	it "should return a count of vehicles" do
+		Vehicle.count.should eq(4)
+	end
+
+	it "should return a count of blue honda accords" do
+		Vehicle.count_blue_hondas.should eq(1)
+	end
+end
+
+
+