app/models/borrow_record.rb
class BorrowRecord < ActiveRecord::Base
attr_accessible :borrow_date, :return_date, :user_id, :book_instance_id
validates_presence_of :user_id, :book_instance_id
belongs_to :user
belongs_to :book_instance
delegate :name, :avatar, to: :user, prefix: true
delegate :preferred_name, to: :user, prefix: true
def self.records_of(book)
total_records = []
book.book_instances.each do |instance|
records = BorrowRecord.includes(:user).where("book_instance_id = ?", instance.id).where(return_date: nil)
total_records += records
end
total_records
end
#def self.create_record(user_id,book_id)
# BorrowRecord.create user_id: user_id, book_id: book_id, borrow_date: DateTime.now
#end
def return_book
update_attribute(:return_date, DateTime.now)
end
end