Question 1

How to make a breadcrumb current based on query parameters in Loaf?

Accepted Answer

Use the :match option with a hash, e.g., breadcrumb 'Posts', posts_path(order: :desc), match: {order: :desc}. This ensures the breadcrumb is marked as current only when the URL includes the specified query parameters, as detailed in the README's match section.

Question 2

Loaf vs gretel for Rails breadcrumbs?

Accepted Answer

Loaf is leaner and focuses on flexibility with manual definition and no markup assumptions, while gretel often provides more automation and convention-based generation. Choose Loaf if you need full control over customization and I18n, but prefer gretel for quicker setup with route-based breadcrumbs.

Question 3

How to style Bootstrap breadcrumbs with Loaf?

Accepted Answer

Use the breadcrumb_trail helper to iterate over Crumb objects and apply Bootstrap classes dynamically. The README provides examples for Bootstrap 4, where you check crumb.current? to add 'active' classes and use link_to_unless for proper markup.

Question 4

Can Loaf handle breadcrumbs for nested resources like posts/comments?

Accepted Answer

Yes, define breadcrumbs in nested controller actions or use before_action callbacks to loop through ancestors. For instance, in CommentsController, add a before_action that iterates over post ancestors to build the trail, as suggested in the controller examples.

Question 5

Why are my Loaf breadcrumbs not translating with I18n?

Accepted Answer

Check that your locale file uses the correct scope (default is loaf.breadcrumbs). For a breadcrumb named 'blog.categories', ensure en.loaf.breadcrumbs.blog.categories is set in your YAML, and verify the scope configuration if overridden in the initializer.

Question 6

How to test breadcrumbs defined with Loaf in Rails tests?

Accepted Answer

Test breadcrumbs in controller specs by inspecting assigned breadcrumbs or using integration tests to verify the rendered trail. Since breadcrumbs are defined via helpers, you can stub or assert the breadcrumb data in your test suite, similar to testing other Rails view components.

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