Railsでhas_manyな関連先の最新の一件が条件を満たすのを取得 - Qiita

class User < ActiveRecord::Base has_many :stamps has_one :last_stamp, ->{ order(created_at: :desc) }, class_name: 'Stamp' end class Stamp < ActiveRecord::Base belongs_to :user scope :_this_week, -> { where(created_at: Date.today.all_week) } end