// AppDataWithKey works similarly to AppData, but uses the provided key instead.
// Also, if the data is not found in the *app.App passed in as the first argument,
// its children apps are also searched. This allows reusable apps to retrieve their
// additional data in contexts where the reusable app pointer is not available.
// (e.g. in template plugins which are called from the parent app). See gnd.la/apps/users
// for an example of this usage.
func AppDataWithKey(a *app.App, key interface{}) interface{} {
ra, _ := a.Get(key).(*App)
if ra != nil {
return ra.Data()
}
if key != reusableAppKey {
for _, ia := range a.Included() {
if data := AppDataWithKey(ia, key); data != nil {
return data
}
}
}
return nil
}
