mongo shell and the --eval

[Rick]

Hi guys..

Can anybody point me at the documentation for the mongo shell eval
command?

I'm trying to execute simple commands such as:

$ mongo dbname --eval "db.collectionname.find()"

This results in an error dbname.collectionname is not defined!!

It appears that db is mapped to the database name so the javascript
isnt being evaluated as normal shell commands

Any ideas?

Is there any documentation on this?

[Eliot Horowitz]

Can you send the exact output?

What you're probably seeing is the DBQuery class output.

try:

mongo dbname --eval "db.foo.find().limit(10).forEach(printjson)"

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[rick....@gmail.com]

Well, for the example you gave of

mongo dbname --eval "db.foo.find().limit(10).

forEach(printjson)"

This worked (I added some test data)

If I just execute:

mongo dbname --eval "db.foo.find().limit(10)"

I get

MongoDB shell version: 1.4.4
url: core
connecting to: core
DBQuery: dbname.foo-> undefined

So.. do I always need to provide a means for the shell to write the output?

[Eliot Horowitz]

Right now, it'll just print the .toString of the result.  In this case the .toString of the cursor object.

Perhaps we can do something smarter if its an eval.  

Want to open a jira case?

[rick....@gmail.com]

Specifically, I want to write a set of scripts which will populate my database with data for use in my BDD tests

So I was expecting to be able to pass sets of insert statements etc i.e.

$mongo dbname --eval "db.collection1.name.insert({ dataset1}}; db.collection2.name.insert({ dataset2}};"

Perhaps I shouldnt be using the shell for this?

[Eliot Horowitz]

That will work, but wouldn't it be easier to go straight?  What language are your tests in?

[rick....@gmail.com]

I'm writing everything in Javascript (using nodejs). The BDD framework I'm using is vows (vowsjs.org)

There is an excellent driver available (http://github.com/christkv/node-mongodb-native) which I use in my main application -

I'm just wasnt sure what the preferred approach to populating mongo databases for my BDD specs for to use.

[Eliot Horowitz]

I would recommend talking to mongo directly using the node driver.