Custom Class Finders

When Formtastic needs to find a handler for an input type (like :string), it uses a Class Finder.

This object maps :string into a class name StringInput and tries to find it in a namespace like Formtastic::Inputs. You can customize this, by creating own ClassFinder that changes the class name or the namespace. For example you can have MyClassFinder that will for :string look up MyNamespace::MyStringInput.

This is useful for plugin authors like activeadmin and formtastic-bootstrap that have custom inputs in own namespace.

The default class finders are InputClassFinder and ActionClassFinder. Both look up the class name in all namespaced, configured in Formtastic::FormBuilder.input_namespaces and Formtastic::FormBuilder.action_namespaces settings.