Some Good Rails Scope Idioms

  scope :by, ->(user) { where(user_id: user.id) }

  scope :followed_by, ->(user) { joins(:follows).where(follows: { user_id: user.id }) }

  scope :reverse_chronological, order('created_at DESC')

  scope :recent, ->(number=5) { reverse_chronological.limit(number) }

  scope :with_role, lambda { |name| where(role: name) }

  scope :founded, where(founder: true)