Mongoimport csv files with string _id and upsert

Question

I\'m trying to use mongoimport to upsert data with string values in _id. Since the ids look like integers (even though they\'re in quotes), mongoimport treats them as intege

Answer 1

Just encountered this same issue and discovered an alternative. You can force Mongo to use string types for non-string values by converting your CSV to JSON and quoting the field. For example, if your CSV looks like this:

key value
123 foo
abc bar

Then you'll get an integer field for key 123 and a string field for key abc. If you convert that to JSON, making sure that all the keys are quoted, and then use --type json when you import, you'll end up with the desired behavior:

{
    "123":"foo",
    "abc":"bar"
}