Minimum row

internal/project/project.go

@@ -223,9 +223,10 @@ type TopDataConfig struct {
 }
 
 type TopDataRowGenerationConfig struct {
-	Dataset   string `json:"dataset,omitempty" yaml:"dataset,omitempty"`
-	Namespace string `json:"namespace,omitempty" yaml:"namespace,omitempty"`
-	Mode      string `json:"mode" yaml:"mode"`
+	Dataset    string `json:"dataset,omitempty" yaml:"dataset,omitempty"`
+	Namespace  string `json:"namespace,omitempty" yaml:"namespace,omitempty"`
+	Mode       string `json:"mode" yaml:"mode"`
+	MinimumRow int    `json:"minimum_row,omitempty" yaml:"minimum_row,omitempty"`
 }
 
 type TopDataClassFeatInjectionConfig struct {
@@ -860,6 +861,9 @@ func validateTopDataRowGeneration(rules []TopDataRowGenerationConfig) []error {
 		default:
 			failures = append(failures, fmt.Errorf("%s.mode %q is not supported", prefix, rule.Mode))
 		}
+		if rule.MinimumRow < 0 {
+			failures = append(failures, fmt.Errorf("%s.minimum_row must be zero or greater", prefix))
+		}
 		key := filepath.ToSlash(dataset)
 		if _, ok := seen[key]; ok {
 			failures = append(failures, fmt.Errorf("%s duplicates an earlier dataset row generation rule", prefix))

internal/project/project_test.go

@@ -202,6 +202,7 @@ topdata:
   row_generation:
     - namespace: portraits
       mode: first_null_row
+      minimum_row: 15000
 `)
 
 	proj, err := Load(root)
@@ -214,7 +215,7 @@ topdata:
 		t.Fatalf("expected one topdata row generation rule, got %#v", rules)
 	}
 	got := rules[0]
-	if got.Dataset != "portraits" || got.Namespace != "portraits" || got.Mode != "first_null_row" {
+	if got.Dataset != "portraits" || got.Namespace != "portraits" || got.Mode != "first_null_row" || got.MinimumRow != 15000 {
 		t.Fatalf("unexpected topdata row generation rule: %#v", got)
 	}
 }
@@ -285,6 +286,7 @@ func TestValidateLayoutRejectsInvalidTopDataValueEncodings(t *testing.T) {
 					{Dataset: "portraits", Mode: "after_base"},
 					{Namespace: "placeabletypes", Mode: "unsupported"},
 					{Mode: "first_null_row"},
+					{Dataset: "classes", Mode: "first_null_row", MinimumRow: -1},
 				},
 			},
 		},
@@ -308,6 +310,7 @@ func TestValidateLayoutRejectsInvalidTopDataValueEncodings(t *testing.T) {
 		"topdata.row_generation[1] duplicates an earlier dataset row generation rule",
 		"topdata.row_generation[2].mode \"unsupported\" is not supported",
 		"topdata.row_generation[3].dataset is required",
+		"topdata.row_generation[4].minimum_row must be zero or greater",
 	} {
 		if !strings.Contains(text, want) {
 			t.Fatalf("expected validation error %q, got %v", want, err)