mongodb Cannot apply $pull/$pullAll modifier to non-array, How to remove array element

Question

i met a problem about mongodb.

db.tt.find()
{ "_id" : ObjectId("513c971be4b1f9d71bc8c769"), 
  "name" : "a", 
  "comments" : [ { "name" : "2" }, { "name" : "3" } ] 
}

above is a test document.

i want to pull comments.name = 2

i do

db.tt.update({'comments.name':'2'},{'$pull':{'comments.$.name':'2'}});

but the console print these message:

Cannot apply $pull/$pullAll modifier to non-array

my mongodb version is 2.0.6

who can help me? Thank you very much

I think the $ symbol in your query is not needed

user20140268
– user20140268

2013-03-10 14:47:09 +00:00
Commented Mar 10, 2013 at 14:47 — user20140268
– user20140268, Commented Mar 10, 2013 at 14:47

JohnnyHK · Accepted Answer · 2013-03-10 15:17:02Z

12

Your $pull syntax is off, it should be:

db.tt.update({'comments.name': '2'}, {$pull: {comments: {name: '2'}}})

answered Mar 10, 2013 at 15:17

JohnnyHK

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3 Comments

Ravi Kumar Over a year ago

db.col.find() { "_id" : ObjectId("d53d7810352eaec7c154b711"), "name" : "Amount", "type" : "text", "message" : { "test value" : 1, "test value1" : 6 } } db.col.update({"_id":ObjectId("d53d7810352eaec7c154b711")},{$pull :{"message": {"test value" : 1}}}); i tried this it is not working for me

JohnnyHK Over a year ago

@RaviKumar Please post that as a new question if you're still having trouble.

Manish Sharma Over a year ago

With what this "{$pull: {comments: {name: '2'}}}" can be replaced,to make it accept string as question poster was trying.

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