Mongo & MySQL assertion parallels

[ScottFreeCode]

My thinking on MongoDB mocks is that, since it's a database, it should largely parallel MySQL (except where the difference between the two is relevant, if there are any).

In MySQL assertions we have four cases:

• value, asserts equality to that value
• field not included, no filtering/asserting on that field
• None, asserts field IS NULL
• validation.ANY, asserts field IS NOT NULL

I know Mongo assertions have the first two, maybe the first three. Is there a way to implement all four in MongoDB queries?