Somehow this code lacks the magic I‘m used from rails:
class BooksController < ApplicationController
def show
@book = Book.find(params[:id])
add_breadcrumb("Home", path: root_path)
add_breadcrumb("Books", path: books_path)
add_breadcrumb(@book.title)
end
end
Only the title is specific to the show method. Home should be set by the application controller and Books by the books controller code.
2. Breadcrumbs are information that this action needs to set. You can set them in the views or in the controller via these helpers. But no matter where you put the data it is custom data that you as developer set and it is specific to this controller.
The information about how to navigate from homepage to this show method is something that either: you can use meta-programming to try to get it if you would for example scope controllers based on paths (not sure it is a good idea) or you have to provided as Rails cannot know if your controllers/views are in the top namespace.
