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book.rb

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+class Book
+ class Book_1 
+    def initialize (title, author, year)
+      title = "Война и мир"
+      author = "Лев  Толстой"
+      year = "1869"
+      is_available = true
+      to_s = "ID: [id], [title] ([author], [year]) - [Доступна/Выдана]"
+      
+  end
+
+  class Book_2
+    def initialize (title, author, year)
+      title = "Мастер и маргарита"
+      author = "Михаил Булгаков"
+      year = "1967"
+      is_available = false
+      to_s = "ID: [id], [title] ([author], [year]) - [Доступна/Выдана]"
+    end
+ 
+  end
+  end
+
+end
+