如何创建信息列表并稍后搜索和排序该信息？

Question

我需要创建简单的书籍信息列表（代码中的数据库），其中包含作者、流派、名称、发行日期和页码。然后按作者搜索（按日期排序，按流派搜索（按作者排序）。最简单的方法是什么？

Answer 1

您可以创建一个Book 类，然后将这些对象存储在Array 中。这很简单，但您可能想阅读一些关于 Ruby 和面向对象编程的知识。

class Book
  attr_accessor :name
  attr_accessor :author
  attr_accessor :genre

  def initialize name, author, genre
    @name = name
    @author = author
    @genre = genre
  end

  def to_s
    "book name: " + @name + "\nauthor: " + @author + "\ngenre: " + @genre
  end
end

# create a few books
book_one = Book.new("Scary Book","Michael", "horror")
book_two = Book.new("Long Book", "Jim", "comedy")
book_three = Book.new("Short Book", "Pam", "romance")

# store them in an Array for sorting and searching
book_array = [book_one, book_two, book_three]

# sort the array by author
sorted_array = book_array.sort_by {|book| book.author}

# find the book(s) in the "romance" genre
romance_books = book_array.select {|book| book.genre == "romance"}