instance method invert_where

Allows you to invert an entire where clause instead of manually applying conditions.

class User
  scope :active, -> { where(accepted: true, locked: false) }
end

User.where(accepted: true)
# WHERE `accepted` = true

User.where(accepted: true).invert_where
# WHERE `accepted` != true

User.active
# WHERE `accepted` = true AND `locked` = false

User.active.invert_where
# WHERE NOT (`accepted` = true AND `locked` = false)

Be careful because this inverts all conditions before invert_where call.

class User
  scope :active, -> { where(accepted: true, locked: false) }
  scope :inactive, -> { active.invert_where } # Do not attempt it
end

# It also inverts `where(role: 'admin')` unexpectedly.
User.where(role: 'admin').inactive
# WHERE NOT (`role` = 'admin' AND `accepted` = true AND `locked` = false)