fix(snippet): fix schema version (#82)

Author: tamas-jozsa

internal/registry/registry.go

@@ -27,8 +27,8 @@ import (
 	"github.com/cloudflare/tf-migrate/internal/resources/url_normalization_settings"
 	"github.com/cloudflare/tf-migrate/internal/resources/workers_kv"
 	"github.com/cloudflare/tf-migrate/internal/resources/workers_kv_namespace"
-	"github.com/cloudflare/tf-migrate/internal/resources/zero_trust_access_application"
 	"github.com/cloudflare/tf-migrate/internal/resources/workers_script"
+	"github.com/cloudflare/tf-migrate/internal/resources/zero_trust_access_application"
 	"github.com/cloudflare/tf-migrate/internal/resources/zero_trust_access_group"
 	"github.com/cloudflare/tf-migrate/internal/resources/zero_trust_access_identity_provider"
 	"github.com/cloudflare/tf-migrate/internal/resources/zero_trust_access_mtls_certificate"

internal/resources/snippet/v4_to_v5.go

@@ -101,7 +101,13 @@ func (m *V4ToV5Migrator) TransformState(ctx *transform.Context, instance gjson.R
 		result, _ = sjson.Delete(result, "attributes.main_module")
 	}
 
-	// Step 3: Set schema_version = 0
+	// Step 3: Ensure files array is preserved
+	// In v4, files is stored as an array in state and remains as an array in v5
+	// We need to explicitly ensure it exists to prevent it from being nil
+	attrs = gjson.Get(result, "attributes")
+	result = state.EnsureField(result, "attributes", attrs, "files", []interface{}{})
+
+	// Step 4: Set schema_version = 0
 	result, _ = sjson.Set(result, "schema_version", 0)
 
 	return result, nil