user.rb

# == Schema Information
#
# Table name: users
#
#  id            :bigint           not null, primary key
#  name          :string(255)
#  email         :string(255)
#  mobile_number :string(255)
#  created_at    :datetime         not null
#  updated_at    :datetime         not null
#
class User < ApplicationRecord
 searchkick

 has_many :blogposts
 def search_data
   {
     name: name,
     email: email,
     total_blogposts: blogposts.count,
     last_published_blogpost_date: last_published_blogpost_date
   }
 end
 ...
end