nutrition field

scratch/cataloguefactsbackfill/main.go

@@ -64,6 +64,17 @@ var scalarFacts = []string{
 
 var arrayFacts = []string{"providers", "highlights", "nutrients"}
 
+// The structured nutrition panel: a jsonb column the agent team fills, which
+// the customer app renders. Its own category because it is neither a scalar
+// nor a text[] — stored as a string it would reach the app as an escaped blob
+// inside the snapshot instead of an object, and every reader would have to
+// decode it twice.
+//
+// Absent on every brand table today, which costs this fact and nothing else.
+// The lines in `nutrients` above are parsed into a panel at read time, so a
+// product backfilled before the column exists still shows figures.
+var jsonFacts = []string{"nutrition"}
+
 type product struct {
 	Productid    int
 	Productbrand string
@@ -312,7 +323,7 @@ func factColumnsOf(db *gorm.DB, table string) []string {
 	}
 
 	var keep []string
-	for _, c := range append(append([]string{}, scalarFacts...), arrayFacts...) {
+	for _, c := range append(append(append([]string{}, scalarFacts...), arrayFacts...), jsonFacts...) {
 		if present[c] {
 			keep = append(keep, c)
 		}
@@ -332,7 +343,9 @@ func factsFor(db *gorm.DB, table string, cols []string, imageID string) (map[str
 
 	selects := make([]string, 0, len(cols))
 	for _, c := range cols {
-		if isArrayFact(c) {
+		// jsonb and text[] are both cast to text for the same reason: GORM's
+		// raw scan cannot land either one in a Go value directly.
+		if isArrayFact(c) || isJSONFact(c) {
 			selects = append(selects, c+"::text AS "+c)
 			continue
 		}
@@ -356,6 +369,21 @@ func factsFor(db *gorm.DB, table string, cols []string, imageID string) (map[str
 		if text == "" {
 			continue
 		}
+		if isJSONFact(c) {
+			// Embedded as an object, not as the text the column scanned to.
+			// Stored as a string it would reach the app as an escaped blob
+			// inside the snapshot, and every reader would decode it twice.
+			//
+			// Unreadable JSON is skipped rather than stored: an absent panel
+			// falls back to the nutrient lines at read time, a broken one does
+			// not.
+			var panel models.NutritionPanel
+			if err := json.Unmarshal([]byte(text), &panel); err != nil || !panel.HasValues() {
+				continue
+			}
+			facts[c] = panel
+			continue
+		}
 		if isArrayFact(c) {
 			values := models.ParsePGArray(text)
 			kept := make([]string, 0, len(values))
@@ -374,6 +402,15 @@ func factsFor(db *gorm.DB, table string, cols []string, imageID string) (map[str
 	return facts, true
 }
 
+func isJSONFact(name string) bool {
+	for _, c := range jsonFacts {
+		if c == name {
+			return true
+		}
+	}
+	return false
+}
+
 func isArrayFact(name string) bool {
 	for _, c := range arrayFacts {
 		if c == name {