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custom_lookup_context_for_layout

🔍 Custom Lookup Context for Layout Fallbacks​

Override layout lookup to provide fallbacks or multi-tenant support. Extend lookup_context.find_all to search additional paths before defaulting to application layout.

# lib/multi_tenant_layouts.rb
module MultiTenantLayouts
  def find_all(name, prefixes = [], *rest)
    tenant = request.subdomains.first
    super(["layouts/#{tenant}/#{name}", name], prefixes, *rest)
  end
end

# config/initializers/layout_lookup.rb
ActionController::Base.prepend_view_path Rails.root.join('app', 'views')
ActionController::Base.lookup_context.singleton_class.prepend(MultiTenantLayouts)

Now Rails attempts app/views/layouts/tenant_name/application.html.erb first, then falls back to the default, enabling tenant-specific theming seamlessly.