Assuming a Book class exist and it has many chapters, and also assuming that the chapter has a position number stored in the database, I'd do something like:
Book
class Chapter < ApplicationRecord belongs_to :book def next_chapter book.chapters.find_by(position: position + 1) end def previous_chapter book.chapters.find_by(position: position - 1) end end
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Assuming a
Book
class exist and it has many chapters, and also assuming that the chapter has a position number stored in the database, I'd do something like: