Removing map entry with minimum key

[steevej (Steeve Juneau)]

@Jan_de_Wilde

This makes me think of my previous idea of having a flat data model with one document per activity. I was then confronted with the argument that such an approach would be a result of still thinking in the relational world and with mongodb there should rather be one document for what belongs together. But it would solve any potential problems to document size or embedded documents.

Look at GridFS-Can we use aggregation query from GridFS specification - #4 by steevej.

I wrote

In some cases, plain old normalization, is still a valid solution.

And we could add: in others it is the best solution.