Loading datastore entities from Python project in Go leads to nested structs slices of slices error

Question

I am writing a module in my Google AppEngine project in Go for performance reasons but need to be able to read from some of the entities I have in datastore. I wrote out the

Answer 1

The solution by someone1 works great but I have many millions of entities and didn't want to have to re-put them all (to add the keep_keys=True to the LocalStructuredProperty).

So, I created a cut-down version of EntityProto which removes the dependency on the key & path etc... Simply replace pb.EntityProto with LocalEntityProto and the existing python-written entities should load OK (I'm using a PropertyLoadSaver for the nested struct).

Disclaimer: I'm only using this to read from Go - I haven't tried writing the same entities back to see if they still load in Python.

import pb "google.golang.org/appengine/internal/datastore"
import proto "github.com/golang/protobuf/proto"

type LocalEntityProto struct {
    Kind             *pb.EntityProto_Kind `protobuf:"varint,4,opt,name=kind,enum=appengine.EntityProto_Kind" json:"kind,omitempty"`
    KindUri          *string              `protobuf:"bytes,5,opt,name=kind_uri" json:"kind_uri,omitempty"`
    Property         []*pb.Property       `protobuf:"bytes,14,rep,name=property" json:"property,omitempty"`
    RawProperty      []*pb.Property       `protobuf:"bytes,15,rep,name=raw_property" json:"raw_property,omitempty"`
    Rank             *int32               `protobuf:"varint,18,opt,name=rank" json:"rank,omitempty"`
    XXX_unrecognized []byte               `json:"-"`
}

func (m *LocalEntityProto) Reset()         { *m = LocalEntityProto{} }
func (m *LocalEntityProto) String() string { return proto.CompactTextString(m) }
func (*LocalEntityProto) ProtoMessage()    {}

func (m *LocalEntityProto) GetKind() pb.EntityProto_Kind {
    if m != nil && m.Kind != nil {
        return *m.Kind
    }
    return pb.EntityProto_GD_CONTACT
}

func (m *LocalEntityProto) GetKindUri() string {
    if m != nil && m.KindUri != nil {
        return *m.KindUri
    }
    return ""
}

func (m *LocalEntityProto) GetProperty() []*pb.Property {
    if m != nil {
        return m.Property
    }
    return nil
}

func (m *LocalEntityProto) GetRawProperty() []*pb.Property {
    if m != nil {
        return m.RawProperty
    }
    return nil
}

func (m *LocalEntityProto) GetRank() int32 {
    if m != nil && m.Rank != nil {
        return *m.Rank
    }
    return 0
}