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I am trying to use mongoimport to translate a one-to-many relational structure into mongoDB using csv files. My approach is to import the “one” file then use the upsert option to append the “many” records as a nested array but it looks like it only replaces the original document instead of appending.
Is this a limitation of mongoimport or could I be doing something wrong?
You can do upserts when using mongoimport, but you cannot use complex operators to perform modifications to the data as you would with a normal update operation. This is a limitation of mongoimport – essentially each piece of data you import must be insert ready even though you are using the upsert functionality, which is basically working as a de-duplication mechanism for your input data.
If you wish to merge in a more sophisticated manner then it would be best to use one of the drivers and merge the data using your language of choice. This also has the advantage of avoiding potential issues with type fidelity and allowing you to code around exceptions etc.