class PostHog::FieldParser

def parse_for_group_identify(fields)
  properties = fields[:properties] || {}
  group_type = fields[:group_type]
  group_key = fields[:group_key]
  check_presence!(group_type, 'group type')
  check_presence!(group_key, 'group_key')
  check_is_hash!(properties, 'properties')
  fields[:distinct_id] ||= "$#{group_type}_#{group_key}"
  common = parse_common_fields(fields)
  isoify_dates! properties
  common.merge(
    {
      event: '$groupidentify',
      properties: {
        '$group_type': group_type,
        '$group_key': group_key,
        '$group_set': properties.merge(common[:properties] || {})
      }
    }
  )
end