slowhas_many.rb

# classes

class User < ApplicationRecord
  has_many :buckets, -> { order(row_order: :asc) }

  def current_transactions
    @current_transactions ||= plaid_user.current_transactions
  end
  
  def get_token
    @token ||= Plaid.exchange_token(public_token).access_token
  end

  def plaid_user(levels: %w(connect))
    @plaid_user ||= Api::Plaid.new(get_token, api_levels: levels)
    # call '#upgrade' on this object to promote api_level
  end
end

class Bucket < ApplicationRecord
  belongs_to :user

  def included_transactions
    user.current_transactions.select do |t|
      t.name == original_name &&
      t.category_id.to_s == original_category.to_s &&
      (t.amount.abs-fluctuation .. t.amount.abs+fluctuation).include?(amount.to_f.abs)
    end
  end

  def percent_complete
    [included_transactions.size/frequency.to_f*100, 100].min
  end
end

# Serializers

class UserSerializer < ActiveModel::Serializer
  has_many :buckets
end

class BucketSerializer < ActiveModel::Serializer
  attributes :percent_complete
end