validate functions can be a bit odd, because unlike views, there isn't a nice interface in Futon for us to use. The quickest way to add the
validate_doc_update function is to treat it like a normal field in our document and type the code right into the value. It's a bit strange, but it is the quickest way to adjust design documents. At the end of the chapter, I'll give you some resources if you want to get a bit cleaner with how you manage design documents.
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