fix(database): 素材存储 - 扩容生成素材 ID 及关联字段

backend/internal/database/schema_test.go

@@ -0,0 +1,62 @@
+package database
+
+import (
+	"fmt"
+	"strings"
+	"sync"
+	"testing"
+
+	"infinite-canvas/backend/internal/model"
+
+	"gorm.io/gorm/schema"
+)
+
+func TestAssetIDColumnsUseSharedLimit(t *testing.T) {
+	tests := []struct {
+		value any
+		field string
+	}{
+		{value: &model.Asset{}, field: "ID"},
+		{value: &model.ProjectAssetLink{}, field: "AssetID"},
+		{value: &model.ProjectAssetCandidate{}, field: "ResolvedAssetID"},
+		{value: &model.AssetVersion{}, field: "AssetID"},
+	}
+
+	for _, test := range tests {
+		parsed, err := schema.Parse(test.value, &sync.Map{}, schema.NamingStrategy{})
+		if err != nil {
+			t.Fatalf("parse schema: %v", err)
+		}
+		field := parsed.LookUpField(test.field)
+		if field == nil {
+			t.Fatalf("field %s not found in %s", test.field, parsed.Table)
+		}
+		if field.Size != model.AssetIDMaxLength {
+			t.Fatalf("%s.%s size = %d, want %d", parsed.Table, field.DBName, field.Size, model.AssetIDMaxLength)
+		}
+	}
+}
+
+func TestPostgresAssetIDMigrationsCoverEveryAssetIDColumn(t *testing.T) {
+	want := map[string]bool{
+		"assets.id":                                  false,
+		"project_asset_links.asset_id":               false,
+		"project_asset_candidates.resolved_asset_id": false,
+		"asset_versions.asset_id":                    false,
+	}
+	for _, migration := range assetIDColumnMigrations {
+		key := migration.table + "." + migration.column
+		if _, exists := want[key]; !exists {
+			t.Fatalf("unexpected asset ID migration %s", key)
+		}
+		if !strings.Contains(migration.statement, fmt.Sprintf("varchar(%d)", model.AssetIDMaxLength)) {
+			t.Fatalf("asset ID migration %s does not use limit %d", key, model.AssetIDMaxLength)
+		}
+		want[key] = true
+	}
+	for key, covered := range want {
+		if !covered {
+			t.Fatalf("missing asset ID migration %s", key)
+		}
+	}
+}