queryByView and reduce functions in views

[iuliandavid]

I have the following view :

let design = DesignDocument(_id: "_design/mydesign", views: [
            "count_doc": [
               "map": "function(doc) { if(doc.type == 'mydoc') { emit(doc._id, 1); } }",
                "reduce": "_count"
            ]
])

in version 2.1.0 I was able to get the result with the following code:

database.queryByView("count_doc", ofDesign: "mydesign", usingParameters: []) { (doc, err) in
            if let doc = doc, err == nil {
                if let count = doc["rows"][0]["value"].int {
                    completion(count, nil)
                } else {
                    completion(0, nil)
                }
            } else {
                completion(nil, err)
            }
        }

Now in the current version:

database?.queryByView("count_doc", ofDesign: "mydesign", usingParameters: []) { (doc, err) in
            if let doc = doc, err == nil {
                if let count = doc.total_rows {
                    completion(count, nil)
                } else {
                    completion(0, nil)
                }
            } else {
                completion(nil, err)
            }
        }

I get the error

Failed to decode AllDatabaseDocuments from response

which is correct since the result is something like
{"rows":[ {"key":null,"value":26} ]}
Can you tell me how to retrieve the result from this view or a view that contains "_stats" function ?

[fabrijp]

Have you tried using this parameter:
usingParameters: [.includeDocs(true)])

[iuliandavid]

Retrieving all the documents it’s pretty expensive while a count or sum is needed.