It is kind of stupid syntax error, tried tons of ways, just couldn't get it work, someone please help.
MongoDB in Go with mgo
, I just tried to simplify use the $ne
operator, code like below, but kept getting compile syntax error:
line 15: convIter := Session.Copy().DB("").C("convs").Find(bson.M {
line 16: "conversationStatus": interface{} {
line 17: bson.M {
line 18: "$ne": "DESTROYED"
line 19: },
line 20: },
line 21: }).Iter()
Tried to add comma ,
remove comma everywhere, just couldn't get it work, always got such compile syntax error like below:
mongodb/query.go:16: syntax error: unexpected {, expecting comma or }
mongodb/query.go:20: syntax error: unexpected }, expecting expression
mongodb/query.go:21: syntax error: unexpected }, expecting expression
bson.M
is a map type, so the bson.M{ ... }
is a map literal. If key-value pairs are written in multiple rows, each has to end with a comma. For details, see How to break a long line of code in Golang?
Also there is no "interface" literal, drop that. A value of interface{}
type can hold / wrap any value, including a bson.M
value. And the interface{}
value creation is automatic, you don't even need a type conversion.
Correct syntax:
convIter := Session.Copy().DB("").C("convs").Find(bson.M{
"conversationStatus": bson.M{
"$ne": "DESTROYED",
},
}).Iter()
Similarly, if you use the bson.D
type (which is a slice), lines not ending with the closing bracket of the literal has to end with a comma, e.g.:
d := bson.D{
{Name: "fieldA", Value: 1},
{Name: "fieldB", Value: "running"},
}
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