refac: atomic merge, lost-update race, RunPurge cost, duplicated walks

internal/domain/entry/entryData.go

@@ -51,12 +51,12 @@ func validateField(field contenttype.Field, data map[string]any) error {
 	value := data[field.Key]
 	if value == nil {
 		if field.Required {
-			return invalidField(field.Key, RuleRequired)
+			return InvalidField(field.Key, RuleRequired)
 		}
 		return nil
 	}
 	if rule := field.Violation(value); rule != "" {
-		return invalidField(field.Key, rule)
+		return InvalidField(field.Key, rule)
 	}
 	return nil
 }
@@ -76,7 +76,7 @@ func firstUnknownField(fields []contenttype.Field, data map[string]any) error {
 		return nil
 	}
 	sort.Strings(unknown)
-	return invalidField(unknown[0], RuleUnknownField)
+	return InvalidField(unknown[0], RuleUnknownField)
 }
 
 func UniqueValues(fields []contenttype.Field, data map[string]any) []UniqueValue {
@@ -91,10 +91,15 @@ func UniqueValues(fields []contenttype.Field, data map[string]any) []UniqueValue
 
 func MediaIDs(fields []contenttype.Field, data map[string]any) map[string]uint32 {
 	ids := map[string]uint32{}
-	for _, field := range contenttype.MediaFields(fields) {
-		if id, ok := contenttype.MediaID(data[field.Key]); ok {
-			ids[field.Key] = id
-		}
+	for _, ref := range contenttype.MediaRefs(fields, data) {
+		ids[ref.Field.Key] = ref.ID
 	}
 	return ids
 }
+
+func MissingMedia(field contenttype.Field, unchanged bool) error {
+	if unchanged {
+		return InvalidField(field.Key, RuleRequired)
+	}
+	return InvalidField(field.Key, contenttype.RuleType)
+}