How do I do a “NOT IN” query in Mongo?

Question

This is my document:

{ 
    title:\"Happy thanksgiving\",
    body: \"come over for dinner\",
    blocked:[
       {user:333, name:\'john\'},
       {user:99         


        

Answer 1

See http://docs.mongodb.org/manual/reference/operator/query/nin/#op._S_nin

db.inventory.find( { qty: { $nin: [ 5, 15 ] } } )

This query will select all documents in the inventory collection where the qty field value does not equal 5 nor 15. The selected documents will include those documents that do not contain the qty field.

If the field holds an array, then the $nin operator selects the documents whose field holds an array with no element equal to a value in the specified array (e.g. , , etc.).