fix: keep foreign keys on native platforms when they are part of the primary key

Author: Dane Pilcher

packages/appsync-modelgen-plugin/src/visitors/appsync-visitor.ts

@@ -1184,7 +1184,11 @@ export class AppSyncModelVisitor<
               connectionInfo.targetName !== 'id'
             ) {
               // Need to remove the field that is targetName
-              connectionInfo.targetNames.forEach(targetName => removeFieldFromModel(model, targetName));
+              // Don't remove the field if it is a primary key field
+              const primaryKeyFieldNames = getModelPrimaryKeyComponentFields(model).map(field => field.name);
+              connectionInfo.targetNames
+                .filter(targetName => !primaryKeyFieldNames.includes(targetName))
+                .forEach(targetName => removeFieldFromModel(model, targetName));
             }
           });
         });