mongodb - Not finding documents using golang's mgo with partial attributes -

i'm trying remove bunch of documents have common attribute. document looks like:

{     _id : {         attr1 : 'foo',         attr2 : 'bar'     },     attr3 : 'baz', } 

more 1 document have same 'foo' value in attr1 entry. i'm trying remove of those. i've got similar this:

type docid struct {     attr1 string `bson:"attr1,omitempty"`     attr2 string `bson:"attr2,omitempty"` }  type doc struct {     id docid `bson:"_id,omitempty"`     attr3 string `bson:"attr3,omitempty"` }   doc := doc{     id : docid{ attr1 : 'foo' }, }  collection := session.db("db").c("collection") collection.remove(doc) 

the problem here i'm getting not found error in remove call. can see odd in code?

thanks lot!

this consequence of way mongodb handles exact match , partial match. can demonstrated using mongo shell:

# here documents > db.docs.find() { "_id" : { "attr1" : "one", "attr2" : "two" }, "attr3" : "three" } { "_id" : { "attr1" : "four", "attr2" : "five" }, "attr3" : "six" } { "_id" : { "attr1" : "seven", "attr2" : "eight" }, "attr3" : "nine" }  # test exact match: works fine > db.docs.find({_id:{attr1:"one",attr2:"two"}}) { "_id" : { "attr1" : "one", "attr2" : "two" }, "attr3" : "three" }  # let's remove attr2 query: nothing matches anymore, # because mongodb still thinks query requires exact match > db.docs.find({_id:{attr1:"one"}}) ... nothing returns ...  # , proper way query partial match: works fine. > db.docs.find({"_id.attr1":"one"}) { "_id" : { "attr1" : "one", "attr2" : "two" }, "attr3" : "three" } 

you find more information topic in documentation.

in go program, suggest use following line:

err = collection.remove(bson.m{"_id.attr1": "foo"}) 

do not forget test errors after each roundtrip mongodb.