forgeplus/app/models/statistic.rb

# == Schema Information
#
# Table name: statistics
#
#  id         :integer          not null, primary key
#  dau        :integer
#  created_at :datetime         not null
#  updated_at :datetime         not null
#  wau        :integer
#  mau        :integer
#

class Statistic < ApplicationRecord
  def self.record
    users = User.all
    count = 0
    t = Time.now - 1.day
    # t = Time.now.at_beginning_of_day
    users.each do |u|
      if !u.last_login_on.nil? && u.last_login_on >= t
        count += 1
      end
    end
    Statistic.create(dau: count)
  end
end