Is there an ArangoDB-Object on Struct?

[Fruchtgummi]

How do I get _key, _rev, _id and very important the lastkey (lastid) from Arango?

type mystruct struc {
   arangodb.document
  .....
or

  _key
  _lastkey
   ....
}

[ewoutp]

@Fruchtgummi all functions that modify a document return a DocumentMeta object.
That object contains the key, rev & ID field. No need to put that in your document structure (allthough you're allowed to do so)

See https://godoc.org/github.com/arangodb/go-driver#CollectionDocuments

[ewoutp]

Humm. missed the lastkey part, checking...

[ewoutp]

I've checked. When replacing or updating documents, there is also a _oldRev field. This field is not directly exposed in the go-driver API, but if can probably get it as follows:

The go driver has a WithReturnOld function that configures a context to return the old document after an update/replace operation.

type YourDocumentType struct {
    Rev string `json:"_rev"`
}
var oldDoc YourDocumentType
ctx := driver.WithReturnOld(context.Background(), &oldDoc)
_, err := collection.ReplaceDocument(ctx, key, newDocument)
if err == nil {
   // Now oldDoc.Rev contains the revision of the document before it was replaced

Hope that answers your question.