class Decidim::Meetings::Metrics::MeetingFollowersMetricMeasure

def calculate
  meetings = Decidim::Meetings::Meeting.where(component: @resource).joins(:component)
  meetings_followers = Decidim::Follow.where(followable: meetings).joins(:user)
                                      .where("decidim_follows.created_at <= ?", end_time)
  cumulative_users = meetings_followers.pluck(:decidim_user_id)
  meetings_followers = meetings_followers.where("decidim_follows.created_at >= ?", start_time)
  quantity_users = meetings_followers.pluck(:decidim_user_id)
  {
    cumulative_users: cumulative_users.uniq,
    quantity_users: quantity_users.uniq
  }
end

def valid?
  super && @resource.is_a?(Decidim::Component)
end