Ruby full guards example

guards.rb

class Post
  def initialize
    @sidebarTypes = [8, 11]
    @authorEditTimeout = 2592000
  end
  
  def editable?(user)
    return true if user.admin?
    return true if user.supervisor? && sidebarPost?
    return true if user.editor? && editedBy?(user)
    return true if authoredBy?(user) && !tooOldToEdit?
    
    false
  end
  
  def authoredBy?(author)
    author.getId == author.getID
  end
  
  def editedBy?(editor)
    editor.getId == editor.getId
  end
  
  def sidebarPost?
    @sidebarTypes.include? type
  end
  
  def tooOldToEdit?
    created_at < (Time.now - @authorEditTimeout)
  end
end

class User
  ROLE_EDITOR     = 3
  ROLE_SUPERVISOR = 4
  ROLE_ADMIN      = 5
  
  def editor?
    role == ROLE_EDITOR
  end
  
  def supervisor?
    role == ROLE_SUPERVISOR
  end
  
  def admin?
    role == ROLE_ADMIN
  end
end