old-roraccounting/app/models/homie.rb

class Homie < ApplicationRecord
  has_many :money_moves

  def self.cash(importance)
     totals = Homie.all.joins(:money_moves).group(:id).order(:id).sum(:amount)

    result = [] 
    Homie.where(["importance > ?", importance]).map do |homie|
      total = totals.fetch(homie.id, 0) 
      { homie: homie, amount: total } 
    end
  end
end