mongoexport fields from subdocuments to csv - mongodb

Question

I am trying to export a field from a subdocument with no luck.
Here is my syntax;
mongoexport -d test -c accounts -f account_number,situses.coordinates -o coordinates.csv --type=csv
The output includes the account_number but not the coordinates field from the subdocument.
According to the docs, this is supposed to work.
The following will export the entire situses subdocument, but I only want the one field.
mongoexport -d test -c accounts -f account_number,situses -o coordinates.csv --type=csv
Am I just referencing the subdocument field wrong or something?
I'm running Mongodb 3.0.4
ADDITIONAL INFO
The following syntax worked on an earlier version of Mongodb (2.6.x ?). Notice the subdoc.0.fieldname syntax.
mongoexport -d test -c accounts -f account_number,situses.0.coordinates -o coordinates.csv --csv
It appears support for directly referencing a subdocument has been removed.

Answer 1

There is mistake in your syntax.
From mongo version 3.0.0, mongoexport removed the --type = csv option. Use the --type=csv option to specify CSV format for the output.
You should use :
mongoexport --db tests --collection accounts --type=csv --fields account_number,situses --out coordinates.csv
For nested fields you should use :
mongoexport --db tests --collection accounts --csv --fields 'account_number,situses.0.coordinates' --out /home/vishwas/c1.csv
EDIT for mongo 3.0 with sub documents:
You need to create separate collection with required fields from subdocuments like -
db.test.aggregate({"$unwind":"$situses"},{"$project":{"_id":0,"account_number":1,"siteUsesCo":"$situses.coordinates"}},{"$out" : "forcsv"})
If you want only one field from subdocument then use aggregation like -
db.test.aggregate({"$unwind":"$situses"},{"$limit":1},{"$project":{"_id":0,"account_number":1,"siteUsesCo":"$situses.coordinates"}},{"$out" : "forcsv"})
And then export from forcsv collection like-
mongoexport --db test --collection forcsv --csv --fields 'account_number,siteUsesCo' --out coordinates.csv
And after exporting delete collection forcsv.

Answer 2

And one more solution, where you can configure output in flexible way
mongo host:port/test --quiet query.js -u username -p passw0rd > accounts.csv
and query.js:
db = db.getSiblingDB('test');
db.getCollection('accounts').find({}, {account_number:1, situses:1, _id:0}).forEach(
function(item_data) { print(`${item_data.account_number},${item_data.situses[0].coordinates}`); });

Answer 3

It looks like this is a known bug to be fixed in 3.0.5.
See this; https://jira.mongodb.org/browse/TOOLS-657