Minimal Yesod multifile site

December 16, 2014

GravatarMichael Snoyman

I was talking with a coworker yesterday who was uncertain of how to start on a Yesod application without using the scaffolding. A single-file application is easy, and is well documented. The question is: how do you make a trivial multi-file site, where the handler functions can live in individual modules and still use type-safe URLs?

The problem in achieving this is separating out the data type creation from the dispatch generation. This is also discussed in the book, but what seems to be lacking is a simple cookbook-style example. So here it is!

This example serves a very minimal site (actually, it even has a JSON service), but can easily be extended to support more complex things. This is a good basis for people looking to implement minimal services without the need for things in the scaffolding like authentication, configurable logging, etc.

Also, if anyone's interested, it would be possible to add this as one of the scaffolding options from yesod init.

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