fix: register import mapping result variable types

mdl-examples/bug-tests/360-import-mapping-result-type.mdl

@@ -0,0 +1,66 @@
+-- ============================================================================
+-- Bug #360: Import-from-mapping result variable type was not registered
+-- ============================================================================
+--
+-- Symptom (before fix):
+--   `import from mapping` actions wrote the correct
+--   `Forms$ResultHandlingMapping` BSON, but the builder did not register
+--   the inferred result type onto the output variable in its variable
+--   scope. Subsequent activities that touched the imported result
+--   (`change`, `commit`, `$Var/Attribute`, association paths) ran without
+--   type info, which caused:
+--     - the writer to fall back to untyped expressions
+--     - re-describes to lose the right declaration shape
+--     - downstream activities to fail with CE0117 in Studio Pro
+--
+-- After fix:
+--   `addImportFromMappingAction` now also writes the result type into
+--   `flowBuilder.varTypes`. When the mapping's JSON structure produces a
+--   single object, the variable becomes `Module.Entity`. When it produces
+--   an array, the variable becomes `List of Module.Entity`. The
+--   ResultHandlingMapping BSON path is unchanged.
+--
+-- Usage:
+--   mxcli exec mdl-examples/bug-tests/360-import-mapping-result-type.mdl -p app.mpr
+--   mxcli -p app.mpr -c "describe microflow BugTest360.MF_ImportPet"
+--   `mx check` against the resulting MPR must report 0 errors and the
+--   `change $Pet (...)` statement after the import must resolve.
+-- ============================================================================
+
+create module BugTest360;
+
+create json structure BugTest360.JSON_Pet
+snippet '{"id": 1, "name": "Fido", "status": "available"}';
+
+create non-persistent entity BugTest360.PetResponse (
+  PetId : integer,
+  Name : string,
+  Status : string
+);
+/
+
+create import mapping BugTest360.IMM_Pet
+  with json structure BugTest360.JSON_Pet
+{
+  create BugTest360.PetResponse {
+    PetId = id,
+    Name = name,
+    Status = status
+  }
+};
+
+-- Caller — uses the imported `$Pet` in a downstream `change`. Without
+-- the result-type registration, the change activity has no resolved
+-- entity for `Status` and Studio Pro surfaces CE0117.
+create microflow BugTest360.MF_ImportPet (
+  $Json: string
+)
+returns BugTest360.PetResponse as $Pet
+begin
+  $Pet = import from mapping BugTest360.IMM_Pet ($Json);
+
+  if $Pet != empty then
+    change $Pet (Status = $Pet/Status + ' (processed)');
+  end if;
+end;
+/

mdl/executor/cmd_microflows_builder_calls.go

@@ -1012,7 +1012,8 @@ func (fb *flowBuilder) addImportFromMappingAction(s *ast.ImportFromMappingStmt)
 		SingleObject:   true,
 	}
 
-	// Determine single vs list and result entity from the import mapping
+	// Determine single vs list and result entity from the import mapping.
+	resultEntityQN := ""
 	if fb.backend != nil {
 		if im, err := fb.backend.GetImportMappingByQualifiedName(s.Mapping.Module, s.Mapping.Name); err == nil {
 			if im.JsonStructure != "" {
@@ -1026,7 +1027,8 @@ func (fb *flowBuilder) addImportFromMappingAction(s *ast.ImportFromMappingStmt)
 				}
 			}
 			if len(im.Elements) > 0 && im.Elements[0].Entity != "" {
-				resultHandling.ResultEntityID = model.ID(im.Elements[0].Entity)
+				resultEntityQN = im.Elements[0].Entity
+				resultHandling.ResultEntityID = model.ID(resultEntityQN)
 			}
 		}
 	}
@@ -1047,6 +1049,13 @@ func (fb *flowBuilder) addImportFromMappingAction(s *ast.ImportFromMappingStmt)
 
 	fb.objects = append(fb.objects, activity)
 	fb.posX += fb.spacing
+	if s.OutputVariable != "" && resultEntityQN != "" && fb.varTypes != nil {
+		if resultHandling.SingleObject {
+			fb.varTypes[s.OutputVariable] = resultEntityQN
+		} else {
+			fb.varTypes[s.OutputVariable] = "List of " + resultEntityQN
+		}
+	}
 
 	if s.ErrorHandling != nil && len(s.ErrorHandling.Body) > 0 {
 		errorY := fb.posY + VerticalSpacing

mdl/executor/cmd_microflows_builder_import_mapping_test.go

@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package executor
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/mendixlabs/mxcli/mdl/ast"
+	"github.com/mendixlabs/mxcli/mdl/backend/mock"
+	mdltypes "github.com/mendixlabs/mxcli/mdl/types"
+	"github.com/mendixlabs/mxcli/model"
+)
+
+func TestAddImportFromMappingRegistersSingleResultType(t *testing.T) {
+	fb := importMappingFlowBuilder(t, "Object")
+
+	fb.addImportFromMappingAction(&ast.ImportFromMappingStmt{
+		OutputVariable: "ImportedOrder",
+		SourceVariable: "Payload",
+		Mapping:        ast.QualifiedName{Module: "Integration", Name: "ImportOrder"},
+	})
+
+	if got := fb.varTypes["ImportedOrder"]; got != "Sales.Order" {
+		t.Fatalf("ImportedOrder type = %q, want Sales.Order", got)
+	}
+}
+
+func TestAddImportFromMappingRegistersListResultType(t *testing.T) {
+	fb := importMappingFlowBuilder(t, "Array")
+
+	fb.addImportFromMappingAction(&ast.ImportFromMappingStmt{
+		OutputVariable: "ImportedOrders",
+		SourceVariable: "Payload",
+		Mapping:        ast.QualifiedName{Module: "Integration", Name: "ImportOrderList"},
+	})
+
+	if got := fb.varTypes["ImportedOrders"]; got != "List of Sales.Order" {
+		t.Fatalf("ImportedOrders type = %q, want list of Sales.Order", got)
+	}
+}
+
+func importMappingFlowBuilder(t *testing.T, rootElementType string) *flowBuilder {
+	t.Helper()
+
+	return &flowBuilder{
+		varTypes: map[string]string{},
+		backend: &mock.MockBackend{
+			GetImportMappingByQualifiedNameFunc: func(moduleName, name string) (*model.ImportMapping, error) {
+				if moduleName != "Integration" {
+					return nil, fmt.Errorf("unexpected module %q", moduleName)
+				}
+				return &model.ImportMapping{
+					JsonStructure: "Integration.OrderPayload",
+					Elements: []*model.ImportMappingElement{
+						{Entity: "Sales.Order"},
+					},
+				}, nil
+			},
+			GetJsonStructureByQualifiedNameFunc: func(moduleName, name string) (*mdltypes.JsonStructure, error) {
+				if moduleName != "Integration" || name != "OrderPayload" {
+					return nil, fmt.Errorf("unexpected json structure %s.%s", moduleName, name)
+				}
+				return &mdltypes.JsonStructure{
+					Elements: []*mdltypes.JsonElement{
+						{ElementType: rootElementType},
+					},
+				}, nil
+			},
+		},
+	}
+}