Antipattern: Homemade Keys and Routes

The smell

• Hand-rolled get "show_post/:slug", to: "posts#show_by_slug" style routes
• Custom controller methods named show_by_slug, user_posts, do_publish
• link_to "...", "/show_post/#{p.slug}" (string URLs) because no helper exists
• Resourceful concepts wearing custom URLs

Why it hurts

• No path/url helpers from resources — every link is bespoke
• redirect_to @post doesn't work
• Polymorphic helpers (form_with model: @post) break
• Authorization scoping (current_user.posts.find(params[:id])) becomes harder
• New devs can't predict URLs from models