How to add values to an bson.D object

Question

I'm working with golang and the MongoDB driver, I want to patch one of my objects according to the data I get from the outside:

I have a struct:

type Pivot struct { Email string `json:"email"` Base string `json:"base"` }

And the patch (with MongoDB Update)

setMap := bson.D{ {"$set", setElements}, } res, err := collection.UpdateMany( ctx, filter, setMap, )

And I want to make the setObject a little bit dynamic:

if len(pivot.Base) > 0 { setElements.append("base", pivot.Base) //this doesn't work... } if len(pivot.Email) > 0 { setElements.append("email", pivot.Email) }

I' ve seen that the setObject can be built like

{"$set", bson.D{ {"processed", pivot.Processed}, }

But how can I make it dynamic?

score 17 · Accepted Answer · 2019-03-22 20:55:44Z

Append a DocElem (mgo) or an E (go.mongodb.org) to the slice depending on the client you are using.

var setElements bson.D if len(pivot.Base) > 0 { setElements = append(setElements, bson.E{"base", pivot.Base}) } if len(pivot.Email) > 0 { setElements = append(setElements, bson.E{"email", pivot.Email}) } setMap := bson.D{ {"$set", setElements}, }

Replace bson.E with bson.DocElem for mgo.

It took me a while to check that bson.D is an abson.E array, I had declared as setElements := []bson.E{}
Is this the last resort? I have lots of fields in my database so any better approach?

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