How to update more than one MongoDB field - mongodb

Question

I am so frustrated with the Official MongoDB for Go. There is really no documentation. I am trying to update more than one field in a collection. All references, as normal are the simplest and updating one field:
update := bson.D{bson.E{"$set", bson.E{"releaseimage", r.ReleaseImage}}}
That works. I have tried various ways to expand that to set two fields and get errors:
update := bson.D{
{"$set",
bson.E{"releaseimage", r.ReleaseImage},
//bson.E{"releasepath", r.ReleasePath},
},
// {"$set",
// bson.E{
// "releasepath", r.ReleasePath}},
}
the first one remove the comments in the first set. invalid syntax for second attempt remove the comments on the second set. invalid syntax.
I am at a loss. To keep going I am doing two updates, one right after another. Inefficient.
Thank you.

Answer 1

For multiple fields, you have to create an array of bson element(bson.E). then append/assign as many fields you want in array item.
var update []bson.E
if r.ReleaseImage != "" {
update = append(update, bson.E{"releaseimage", r.ReleaseImage})
}
if r.Releasepath != "" {
update = append(update, bson.E{"releasepath", r.Releasepath})
}
// now update db
result, err := coll.UpdateOne(
context.Background(),
bson.D{
{"id", r.ID},
},
bson.D{
{"$set", update},
{"$currentDate", bson.D{
{"updated", true},
}},
},
)
Hope this helps

Answer 2

Simply do like this:
uQuery := make(bson.M)
if len(r.ReleaseImage)>0{
uQuery["releaseimage"]=r.ReleaseImage
}
if len(r.Releasepath)>0{
uQuery["releasepath"]=r.Releasepath
}
updateQ := make(bson.M)
updateQ["$set"] = uQuery
Now simply pass 'updateQ' to mongodb update Wrapper function along with findQuery.