如何在不同的文件中使用属性？
如何在不同的文件中使用属性？
提问于 2018-10-24 05:40:39
我正在完成我的课程，一个简单的图书馆系统。
我面临的问题如下：
book.rb
class Book
attr_accessor :title, :author, :language, :classification, :isbn, :book_id, :borrow_status
def initialize(title, author, language, classification, isbn, book_id, borrow_status)
@title = title
@author = author
@language = language
@classification = classification
@isbn = isbn
@book_id = book_id
@borrow_status = borrow_status
end
def bookid
@book_id
end
def booklist
@title = @title.split(/ |\_|\-/).map(&:capitalize).join(" ")
@author = @author.split(/ |\_|\-/).map(&:capitalize).join(" ")
@language = @language.capitalize!
@isbn.to_s
@book_id.to_s
{
"Title" => @title,
"Author" => @author,
"Language" => @language,
"Classification" => @classification,
"ISBN" => @isbn,
"Book ID" => @book_id,
"Status" => @borrow_status,
}
end
enduser.rb
require_relative 'book.rb'
class User
attr_accessor :name, :address, :gender, :age, :id, :borrow
def initialize(name, address, gender, age, id, borrow)
@name = name
@address = address
@gender = gender
@age = age
@id = id
@borrow = borrow
end
def userlist
@name = @name.split(/ |\_|\-/).map(&:capitalize).join(" ")
@address = @address.split(/ |\_|\-/).map(&:capitalize).join(" ")
@age.to_s
@id.to_s
if @borrow.nil?
puts "nothing"
elsif
puts #I wish I can put book's name here, if I entered correct @borrow. eg.,for user3's @borrow=4(in top.rb), user3.@borrow=book4.@book_id, then print @name of book4
else
puts "error"
end问题出在user.rb内部的if-elsif-else循环中，
如果我输入正确的@
，我希望我能把书的名字写在这里。例如，对于用户3的@borrow=4(在top.rb中)，user3.@borrow=book4.@book_id，然后print @name of book4
有什么解决方案吗？
回答 1
Stack Overflow用户
回答已采纳
发布于 2018-10-24 06:27:38
#user.rb
require_relative 'book.rb'
class User
attr_accessor :name, :address, :gender, :age, :id, :borrow
def initialize(name, address, gender, age, id, borrow)
@name = name
@address = address
@gender = gender
@age = age
@id = id
@borrow = borrow
end
def userlist
@name = @name.split(/ |\_|\-/).map(&:capitalize).join(" ")
@address = @address.split(/ |\_|\-/).map(&:capitalize).join(" ")
@age.to_s
@id.to_s
if borrow.nil?
puts "nothing"
elsif borrow
puts borrow.title
else
puts "error"
end
end
end
@book = Book.new('Book1', 'Auth1', 'EN', 'fiction', 'isb123', 1, 'borrowed')
@user = User.new('Mr Foo', '123 st', 'male', 23, 123, nil)
@user.borrow=@book
@user.userlist
#=>Book1但是，您可能希望发送一个图书数组，然后需要修改您的方法来处理数组
def userlist
@name = @name.split(/ |\_|\-/).map(&:capitalize).join(" ")
@address = @address.split(/ |\_|\-/).map(&:capitalize).join(" ")
@age.to_s
@id.to_s
if borrow.nil?
puts "nothing"
elsif borrow.length > 0 # checks if anythint in the array
borrow.each{ |b| puts b.title }
else
puts "error"
end
end页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/52958213
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