vchunikhin commented on code in PR #22967:
URL: https://github.com/apache/beam/pull/22967#discussion_r960608751
##########
learning/tour-of-beam/backend/internal/storage/datastore.go:
##########
@@ -227,5 +227,34 @@ func (d *DatastoreDb) SaveContentTrees(ctx
context.Context, trees []tob.ContentT
return nil
}
+// Get learning unit content by unitId
+func (d *DatastoreDb) GetUnitContent(ctx context.Context, sdk tob.Sdk, unitId
string) (unit *tob.Unit, err error) {
+ var tbNodes []TbLearningNode
+ rootKey := pgNameKey(TbLearningPathKind, sdkToKey(sdk), nil)
+
+ query := datastore.NewQuery(TbLearningNodeKind).
+ Namespace(PgNamespace).
+ Ancestor(rootKey).
+ FilterField("id", "=", unitId)
+
+ _, err = d.Client.GetAll(ctx, query, &tbNodes)
+ if err != nil {
+ return nil, fmt.Errorf("query unit failed: %w", err)
+ }
+
+ switch {
+ case len(tbNodes) == 0:
+ return nil, nil
Review Comment:
From my perspective, it's not a good approach to return the double nil to
handle this case later. I recommend you return error here.
As for the next step:
```
if err != nil {
log.Println("Get unit content error:", err)
finalizeErrResponse(w, http.StatusInternalServerError,
INTERNAL_ERROR, "storage error")
return
}
if unit == nil {
log.Println("Get unit content error:", err)
finalizeErrResponse(w, http.StatusNotFound, NOT_FOUND, "unit
not found")
return
}
```
Maybe the best way to create custom errors and handle them using switch-case
It' not major because it's related to your code style. I'm sharing to you my
thoughts about that.
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