start on blog functionality

app/controllers/blog_controller.rb

@@ -0,0 +1,13 @@
+class BlogController < ApplicationController
+
+  def page
+    slug = params[:slug]
+    return redirect_to(root_path) unless slug
+    @page = get_page(slug)
+    return redirect_to(root_path) unless @page
+  end
+
+  def get_page(slug)
+    Page.new(slug)
+  end
+end

app/models/page.rb

@@ -0,0 +1,10 @@
+class Page
+
+  attr_reader :year , :month , :day , :title
+  def initialize(path)
+    @year , @month , @day , @title = path.split("-")
+    raise "Invalid path #{path}" unless @title
+    @title = @title.split(".").first
+  end
+
+end

app/views/blog/page.haml

@@ -0,0 +1,3 @@
+%h1 Blog
+
+= @page.title

config/application.rb

@@ -26,6 +26,8 @@ module WebDevSite
 
     config.assets.paths << Gem.loaded_specs['susy'].full_gem_path+'/sass'
 
+    config.blog_path = Rails.root.to_s + "/app/blog"
+
     # Settings in config/environments/* take precedence over those specified here.
     # Application configuration should go into files in config/initializers
     # -- all .rb files in that directory are automatically loaded.

config/environments/test.rb

@@ -1,6 +1,8 @@
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
+  config.blog_path = Rails.root.to_s + "/spec/blog"
+
   # The test environment is used exclusively to run your application's
   # test suite. You never need to work with it otherwise. Remember that
   # your test database is "scratch space" for the test suite and is wiped

config/routes.rb

@@ -26,4 +26,7 @@ Rails.application.routes.draw do
 
 
   root to: 'high_voltage/pages#show' , id: 'index'
+
+  get "/blog" , to: "blog#index" , as: :blog_index
+  get "/blog/*slug" , to: "blog#page" , as: :blog_page
 end

spec/features/blog/page_spec.rb

@@ -0,0 +1,14 @@
+
+feature 'Page show' do
+
+  scenario 'page shows for correct slug' do
+    visit blog_page_url("2017-2-2-Bitcoin")
+    expect(page).to have_content("Blog")
+  end
+  scenario 'page title shows for correct slug' do
+    visit blog_page_url("2017-2-2-Bitcoin")
+    expect(page).to have_content("Bitcoin")
+  end
+
+
+end

spec/models/page_spec.rb

@@ -0,0 +1,33 @@
+require 'rails_helper'
+
+RSpec.describe Page, type: :model do
+
+  describe "creation" do
+    it "ok with valid slug" do
+      page = Page.new("1993-2-4-title")
+      expect(page).not_to eq nil
+    end
+    it "raises with invalid slug" do
+      expect{Page.new("1993-4-title")}.to raise_error RuntimeError
+    end
+  end
+
+  describe "basic api" do
+    before :each do
+      @page = Page.new("1993-2-4-title")
+    end
+    it "returns title" do
+      expect(@page.title).to eq "title"
+    end
+    it "returns dates" do
+      expect(@page.year).to eq "1993"
+      expect(@page.month).to eq "2"
+      expect(@page.day).to eq "4"
+    end
+  end
+
+  it "returns title without extension if given file name" do
+    page = Page.new("1993-2-4-title.rb")
+    expect(page.title).to eq "title"
+  end
+end