class Schema
  def initialize(resource)
    @schema = resource.get(:schema)
  end
  def type(t)
    @schema.select { |c| c['type'] == t }.map { |c| c['name'] }.uniq
  end
end
person_schema = Schema.new(Person)
family_schema = Schema.new(Family)

DATETIME_ATTRIBUTES = person_schema.type(:datetime) + family_schema.type(:datetime).map { |c| 'family_' + c }
BOOLEAN_ATTRIBUTES  = person_schema.type(:boolean)  + family_schema.type(:boolean).map  { |c| 'family_' + c }
INTEGER_ATTRIBUTES  = person_schema.type(:integer)  + family_schema.type(:integer).map  { |c| 'family_' + c }
IGNORE_ATTRIBUTES   = %w(updated_at created_at family_updated_at family_latitude family_longitude)