Further on with the question
https://stackoverflow.com/questions/60072372/filtering-values-out-of-a-bson-m-in-golang/
where the answer says to use `range server.installed` while the comment says
server.host undefined (type string has no field or method subject)
This is what I've tried with the MongoDB `[]bson.M{}` type results
(obtained from like `$lookup`):
The []bson.M{} type of result I'm getting is:
[map[_id:ObjectID("65529d178688bac31b739f82")
author:[map[_id:ObjectID("65529d168688bac31b739f81")
created_at:1699912982379 name:Mehran updated_at:1699912982379]]
author_id:ObjectID("65529d168688bac31b739f81") created_at:1699912983386
name:Test pages:124 updated_at:1699912983386]]
I've made several attempts but was unable to access the author field of the
lookup result in Go.
a := []author{}
for _, val := range result { a = append(a, val["author"].(primitive.A)[0]) }
- If using val.author, I'm getting val.author undefined (type
primitive.M has no field or method author)
- If using val["author"], I'm getting invalid operation: cannot index
val["author"] (map index expression of type interface{})
- If using val["author"].(primitive.A)[0], I'm getting cannot use
val["author"].(primitive.A)[0] (variable of type interface{}) as author
value in argument to append: *need type assertion*
And how to go about to fix this "need type assertion" just stumbled me, as
I've tried val["author"].(primitive.A).([]main.author)[0], or
[]author(val["author"].(primitive.A))[0], but I'm getting invalid
operation: cannot call non-function val["author"].(primitive.A) (comma, ok
expression of type primitive.A)
and I've now run out of ideas how to fix it.
Please help
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