Right, but we're disappointed that MongoDB markets itself to fit into NoSQL niche, while it doesn't. If it honestly declared its shortcomings, we'd have nothing against, we'd love it.
For example, it doesn't support crucial for NoSQL "compare-and-set" functionality to avoid transactions/locks. Their best suggestion is to use findAndUpdate() with the full object for "find". And it works (though slow) when you have static schema. But over time you'll want to change your objects, and findAndUpdate() won't find them anymore. Grief. Also, order of fields in nested JSON object matters for findAndUpdate(), so have a happy time debugging why it doesn't find some objects anymore.
For example, it doesn't support crucial for NoSQL "compare-and-set" functionality to avoid transactions/locks. Their best suggestion is to use findAndUpdate() with the full object for "find". And it works (though slow) when you have static schema. But over time you'll want to change your objects, and findAndUpdate() won't find them anymore. Grief. Also, order of fields in nested JSON object matters for findAndUpdate(), so have a happy time debugging why it doesn't find some objects anymore.