book.rb

# == Schema Information
#
# Table name: books
#
#  id           :bigint           not null, primary key
#  title        :string
#  release_year :integer
#  created_at   :datetime         not null
#  updated_at   :datetime         not null
#
class Book < ApplicationRecord
    include Hashid::Rails

    attr_accessor :book_authors_attributes

    has_many :chapters, dependent: :destroy
    has_many :book_authors, dependent: :destroy

    validates :title, presence: true

    accepts_nested_attributes_for :book_authors, allow_destroy: true

    # Outputs a formatted list of the book's authors
    def author_str
        authors = ""
        book_authors.each do |author|
            authors << "#{author.author_name}, "
        end
        authors.delete_suffix(', ')
    end
end