support datafields in projection

catalog/schema.go

@@ -61,6 +61,9 @@ type Schema struct {
 	CategoryField     string `json:"category_field,omitempty"`
 	BrandField        string `json:"brand_field,omitempty"`
 	ImageField        string `json:"image_field,omitempty"`
+	// AttributesFields names the keys in the source map[string]any that
+	// should be extracted and built into the Projection's json.RawMessage Attributes field.
+	AttributesFields []string `json:"attributes_fields,omitempty"`
 	// ItemIdField is the source-side key carrying the producer's catalog
 	// item id (uint32-equivalent). DefaultSchema points at "id" (matching
 	// the product service's /api/get/{sku} shape). Producers that omit
@@ -127,6 +130,7 @@ func DefaultSchema() Schema {
 		// Standard product service carries the integer catalog id under "id".
 		ItemIdField:      "id",
 		UpdatedAtField:    "updated_at",
+		AttributesFields: []string{"data"},
 
 		FixedCurrency:    "",     // read from source if present
 		DefaultTaxClass:  "standard",
@@ -165,6 +169,7 @@ func BygglagretSchema() Schema {
 		ImageField:       "PrimaryImage",
 		ItemIdField:      "item_id",
 		UpdatedAtField:   "LastModifiedMs",
+		AttributesFields: []string{"data"},
 
 		FixedCurrency:    "SEK",
 		DefaultTaxClass:  "standard",