Пример прямо из документации
class Employee < ActiveRecord::Base
scope :activated, ->(boolean = true) { where(active: boolean) }
scope :salary_gt, ->(amount) { where('salary > ?', amount) }
# Scopes are just syntactical sugar for class methods, which may also be used:
def self.hired_since(date)
where('start_date >= ?', date)
end
def self.ransackable_scopes(auth_object = nil)
if auth_object.try(:admin?)
# allow admin users access to all three methods
%i(activated hired_since salary_gt)
else
# allow other users to search on `activated` and `hired_since` only
%i(activated hired_since)
end
end
private_class_method :ransackable_scopes
end
Employee.ransack({ activated: true, hired_since: '2013-01-01' })
Employee.ransack({ salary_gt: 100_000 }, { auth_object: current_user })