[#6590] apply nullifyMisingField for request.auth.* and request.body.* back relations when the relation field is pointing to a different collection

core/record_field_resolver_runner.go

@@ -479,7 +479,11 @@ func (r *runner) processActiveProps() (*search.ResolverResult, error) {
 				}
 				return nil, fmt.Errorf("missing back relation field %q", parts[2])
 			}
+
 			if backField.Type() != FieldTypeRelation {
+				if r.nullifyMisingField {
+					return &search.ResolverResult{Identifier: "NULL"}, nil
+				}
 				return nil, fmt.Errorf("invalid back relation field %q", parts[2])
 			}
 
@@ -492,7 +496,11 @@ func (r *runner) processActiveProps() (*search.ResolverResult, error) {
 				return nil, fmt.Errorf("failed to initialize back relation field %q", backField.GetName())
 			}
 			if backRelField.CollectionId != collection.Id {
-				return nil, fmt.Errorf("invalid back relation field %q collection reference", backField.GetName())
+				// https://github.com/pocketbase/pocketbase/discussions/6590#discussioncomment-12496581
+				if r.nullifyMisingField {
+					return &search.ResolverResult{Identifier: "NULL"}, nil
+				}
+				return nil, fmt.Errorf("invalid collection reference of a back relation field %q", backField.GetName())
 			}
 
 			// join the back relation to the main query

core/record_field_resolver_test.go

@@ -601,7 +601,8 @@ func TestRecordFieldResolverResolveCollectionFields(t *testing.T) {
 		{"self_rel_many.self_rel_many.self_rel_many.self_rel_many.self_rel_many.self_rel_many.self_rel_many.id", true, ""},
 
 		// back relations
-		{"rel_one_cascade.demo4_via_title.id", true, ""}, // non-relation via field
+		{"rel_one_cascade.demo4_via_title.id", true, ""},        // not a relation field
+		{"rel_one_cascade.demo4_via_self_rel_one.id", true, ""}, // relation field but to a different collection
 		{"rel_one_cascade.demo4_via_rel_one_cascade.id", false, "[[demo4_rel_one_cascade_demo4_via_rel_one_cascade.id]]"},
 		{"rel_one_cascade.demo4_via_rel_one_cascade.rel_one_cascade.demo4_via_rel_one_cascade.id", false, "[[demo4_rel_one_cascade_demo4_via_rel_one_cascade_rel_one_cascade_demo4_via_rel_one_cascade.id]]"},
 
@@ -615,8 +616,11 @@ func TestRecordFieldResolverResolveCollectionFields(t *testing.T) {
 		// @request.auth relation join
 		{"@request.auth.rel", false, "[[__auth_users.rel]]"},
 		{"@request.auth.rel.title", false, "[[__auth_users_rel.title]]"},
+		{"@request.auth.demo1_via_rel_many.id", false, "[[__auth_users_demo1_via_rel_many.id]]"},
 		{"@request.auth.rel.missing", false, "NULL"},
 		{"@request.auth.missing_via_rel", false, "NULL"},
+		{"@request.auth.demo1_via_file_one.id", false, "NULL"}, // not a relation field
+		{"@request.auth.demo1_via_rel_one.id", false, "NULL"},  // relation field but to a different collection
 
 		// @collection fieds
 		{"@collect", true, ""},