How override model in Magento correctly?

Question

guys.

I need to override 2 functions in different classes (CatalogSearch/Layer.php and CatalogSearch/Mysql4/Fulltext/Collection.php). So, I have a config file:

Answer 1

The resource models are probably handled separately, try this:

<global>
    <models>
        <catalogsearch>
            <rewrite>
                <layer>My_Modulename_Model_CatalogSearch_Layer</layer>
            </rewrite>
        </catalogsearch>
        <catalogsearch_mysql4>
            <rewrite>
                <fulltext_collection>My_Modulename_Model_CatalogSearch_Mysql4_Fulltext_Collection</fulltext_collection>
            </rewrite>
        </catalogsearch_mysql4>
    </models>
</global>