Mojolicious is an MVC framework. But, unlike Catalyst, Mojolicious does not provide a model API. This is a good thing: Mojolicious works well with any model layer, including the existing models used by your current application.
DBIx::Class is a popular model layer for Mojolicious applications. DBIx::Class (or "DBIC") is an Object-Relational Mapper (ORM) to map objects onto a relational database. This allows for a well-organized model layer, and a standard API to access the data.
For those who read last month's posts on Writing Reusable Controllers and Writing Extensible Controllers, this post introduces the end result of those posts: The Mojolicious DBIC Plugin. This plugin makes it easier to start using DBIx::Class with Mojolicious.