service.rb

class BaseService
  def self.inherited(superclass)
    Object.send(:define_method, superclass.name) do |*params|
      superclass.new(*params).call
    end
  end
end

class UnfollowObjectService < BaseService
  def initialize(object, user)
    @object = object
    @user = user
  end

  def call
    Following.where(object: @object, follower: @user).update_all(deleted_at: Time.current)
  end
end

UnfollowObjectService(Tweet.find(1), User.find(2))