Love it!

[scf37]

I have written similar library for constructing queries based on string interpolator but yours have many interesting features. I think I'll use mix of the two with following features, I hope they will be useful to develop your own library:

• Scala 2.12
• outer {} are optional: coll.findOne(m"name:$name")
• typechecking of field values
• hand-written recursive descent parser. It is not that difficult to create: https://gist.github.com/scf37/17caf87eacb82d097a06e292a0161f52
• mongodb scala drivers are not necessary - modern mongo java driver is good enough for Scala