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I am trying to get all submissions documents that contain all of the tags listed in an array.

My current code looks like this:

submissions.find({ tags: { $all => tags } })
print tags.count

However, upon running, I receive the following error on the second line:

BSON::InvalidKey at /
NilClass instances are not allowed as keys in a BSON document.

It should also be noted that the following does work as it should (though it does not achieve my desired result):

submissions.find({ tags: tags })
print tags.count

How can I fix my original code to find the wanted documents properly?

Ethan McTague
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1 Answers1

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The $all expression in MongoDB is:

submissions.find({ tags: { $all: tags }});

In this case, "tags" must be an array (tags = ['tag1','tag2','tag3'])

Why do you used "$all => tags" instead "$all: tags" ?

Rafael Schettino
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  • I was trying that at first, but it was giving me a syntax error, so I changed it. After you pointed this out, I realized that the '$all' was supposed to be a string in ruby, which was the source of the error. Thanks! – Ethan McTague Sep 15 '16 at 01:49