I have a class called Recipe as follows:

    class Recipe extends Page {
    
    	static $db = array(
    		"Title" => "Text"
    	);
    
    	static $many_many = array(
    		"RecipeTypes" => "RecipeType"
    	);
    }

And a class called RecipeType as follows:

    class RecipeType extends DataObject {
    	static $db = array(
    		"Title" => "Text",
    	);

    	static $belongs_many_many = array(
    		"Recipes" => "Recipe"
    	);
    }

For my site's search functionality, I want the search results to be every Recipe which has a Title that matches the search parameter, as well as every Recipe which has a RecipeType whose Title matches the search parameter.

I've tried the following:

    return Recipe::get()->filterAny(array(
    	'Title:PartialMatch' => $searchString,
    	'RecipeTypes.Title:PartialMatch' => $searchString
    ));

But that is only returning Recipes whose Title matches the search parameter; it's not returning any Recipes where one of the Recipe's RecipeTypes' Title property matches the search parameter.

Any ideas?