has_scope

Maps query parameters directly to ActiveRecord scopes with minimal code, as shown in controller examples where ?featured=true automatically applies the featured scope.

Supports boolean, hash, and array parameter types with control options like :only, :except, :if, and :unless, allowing precise scope application based on conditions.

Can be included in plain Ruby objects (POROs) for reuse outside Rails controllers, enabling filtering logic in service objects or background jobs, as demonstrated in the GraduationsSearchQuery example.

Provides a current_scopes helper to easily check applied scopes, useful for debugging or conditional logic in views, returning a hash like { featured: true, by_degree: 'phd' }.