How to use decorator in rails correctly? -


i'm newbie in using decorators , need understand how use right , doing wrong.

book_decorator.rb

class bookdecorator < applicationdecorator   delegate_all    def in_users_list?(user)     if user.books.exists?       true     end   end end

views/books/index.html.slim

- if book.in_users_list?(current_user)   - button_text = 'i've read book' ... #depict buttons , links

books_controller.rb

class bookscontroller < applicationcontroller   expose(:book, attributes: :book_params, finder_parameter: :id)   expose_decorated(:book, decorator: bookdecorator) ...

i've followed these tutorials (https://github.com/netguru/decent_decoration https://github.com/drapergem/draper#decorating-objects) , seems fine, when i'm on books index page, says

undefined method `in_users_list?' book:0x007f6f4a0a4a18

i suppose still doesn't know should use method decorator, how fix it? can't understand i've done wrong, please find , fix problem! thank in advance!

well, had add expose_decorated(:books) in books_controller. thing it's because i'm using in index method, books (not book) should decorated


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