05-01-title_helper.md

Unit 5

Chapter 1: Title Helper

In this chapter, you will create a title helper. This will be the basis of the title in each page on your site.

New Branch

Enter the command "git checkout -b 05-01-title_helper".

Testing and Creating the Title Helper

• Create the file test/helpers/application_helper_test.rb with the following content:

# rubocop:disable Metrics/LineLength

require 'test_helper'

class ApplicationHelperTest < ActionView::TestCase
  test 'full title helper' do
    assert_equal full_title, 'Generic App Template'
    assert_equal full_title('About'), 'About | Generic App Template'
    assert_equal full_title('Contact'), 'Contact | Generic App Template'
    assert_equal full_title('Michael Hartl'), 'Michael Hartl | Generic App Template'
  end
end

# rubocop:enable Metrics/LineLength

• Enter the command "sh testh.sh". Your helper test should fail.
• Replace the contents of app/helpers/application_helper.rb with the following:

#
module ApplicationHelper
  # Returns the full title on a per-page basis
  def full_title(page_title = '')
    base_title = 'Generic App Template'
    if page_title.empty?
      base_title
    else
      page_title + ' | ' + base_title
    end
  end
end

• Enter the command "sh testh.sh". Your helper test should now pass.
• Enter the command "sh testhl.sh". Rails Best Practices will warn you about an unused method (full_title within ApplicationHelper), but don't worry about this now, because you will use it on every web page on your site.
• Enter the command "sh git_check.sh". All tests pass, and RuboCop finds no offenses. (Again, you will address the unused method issue flagged by Rails Best Practices after this chapter.)
• Enter the following commands:

git add .
git commit -m "Added title helper"

Wrapping Up

• Enter the command "git push origin 05-01-title_helper".
• Go to the GitHub repository and click on the "Compare and pull request" button for this branch.
• Accept this pull request to merge it with the master branch, but do NOT delete this branch.
• Enter the following commands:

git checkout master
git pull
sh heroku.sh