// Load a datastore value into a model and add the key
func GetModel(ctx appengine.Context, key *datastore.Key, model models.Model) error {
err := datastore.Get(ctx, key, model)
if err == nil {
model.SetKey(key)
}
return err
}
// Call the parent Next and set the model's key
func (iterator *ModelIterator) Next(destModel models.Model) (*datastore.Key, error) {
modelKey, err := iterator.Iterator.Next(destModel)
if err == nil {
destModel.SetKey(modelKey)
}
return modelKey, err
}
// Load multiple datastore values into a slice of models
func GetModels(ctx appengine.Context, keys []*datastore.Key, modelSlice []models.Model) error {
err := datastore.GetMulti(ctx, keys, modelSlice)
var (
index int
model models.Model
)
for index, model = range modelSlice {
model.SetKey(keys[index])
}
return err
}
// Store a Model, and call SetKey after generating its key (if it doesn't
// have one already).
func PutModel(ctx appengine.Context, model models.Model) error {
modelKey, err := model.Key()
if err == models.NoKeyLoaded {
modelKey = datastore.NewIncompleteKey(ctx, model.Kind(), nil)
} else if err != nil {
panic(err)
}
key, err := datastore.Put(ctx, modelKey, model)
if err == nil {
model.SetKey(key)
}
return err
}