Snippets of code that are very useful in .rb files in Rails

very_useful.rb

#application_controller.rb
  rescue_from CanCan::AccessDenied do |exception|
    flash[:error] = "Access Denied"
    redirect_to root_url
  end

#application_helper.rb
  def javascript(*files)
    content_for(:head) { javascript_include_tag(*files)}
  end
  
  def title(page_title)
    content_for(:title) { page_title }
  end
  
  def gertig_js_header(js_ph_file) #, js_ap_file)
    content_for(:head) {
        javascript_include_tag js_ph_file
        #javascript_include_tag js_ap_file
    }
  end

#user.rb

  #Creates Single reference for Username
  def full_name
    "#{first_name} #{last_name}" 
  end
  
  #Conditional Validation (Episode 41)
  def should_validate_password?
    updating_password || new_user
    #self.role != 'admin'
    #current_user.role == 'player'
  end
  
  ###This is to account for uppercase in emails, especially because Heroku and PostgreSQL are case sensitive and SQLite is not
  before_save do
    self.email.downcase! if self.email
  end

  def self.find_for_authentication(conditions) 
    conditions[:email].downcase! 
    super(conditions) 
  end