如何更新多个MongoDB字段

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

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.