func (this *genericDataModelImpl) GetItemPreferences(itemId uint64) (PreferenceArray, error) {
if prefs, ok := this.itemPreferenceMap[itemId]; ok {
if !this.itemSorted.Contains(itemId) {
sort.Sort(prefs)
prefs.buildCache()
this.itemPreferenceMap[itemId] = prefs
this.itemSorted.Add(itemId)
}
return prefs, nil
}
return nil, cf.NoSuchItemError(itemId)
}
func (this *genericDataModelImpl) PreferenceValue(userId, itemId uint64) (float64, error) {
prefs, err := this.GetUserPreferences(userId)
if err != nil {
return 0, err
}
values := prefs.Values()
for i, id := range prefs.Ids() {
if id == itemId {
return values[i], nil
}
}
return 0.0, cf.NoSuchItemError(itemId)
}