fix(mongo): validate usage of migrator and entity generator

Closes #1801

packages/core/src/MikroORM.ts

@@ -133,18 +133,14 @@ export class MikroORM<D extends IDatabaseDriver = IDatabaseDriver> {
    * Gets the EntityGenerator.
    */
   getEntityGenerator<T extends IEntityGenerator = IEntityGenerator>(): T {
-    // eslint-disable-next-line @typescript-eslint/no-var-requires
-    const { EntityGenerator } = require('@mikro-orm/entity-generator');
-    return new EntityGenerator(this.em);
+    return this.driver.getPlatform().getEntityGenerator(this.em) as T;
   }
 
   /**
    * Gets the Migrator.
    */
   getMigrator<T extends IMigrator = IMigrator>(): T {
-    // eslint-disable-next-line @typescript-eslint/no-var-requires
-    const { Migrator } = require('@mikro-orm/migrations');
-    return new Migrator(this.em);
+    return this.driver.getPlatform().getMigrator(this.em) as T;
   }
 
 }

packages/core/src/platforms/Platform.ts

@@ -1,6 +1,6 @@
 import { EntityRepository } from '../entity';
 import { NamingStrategy, UnderscoreNamingStrategy } from '../naming-strategy';
-import { Constructor, EntityProperty, IPrimaryKey, ISchemaGenerator, Primary } from '../typings';
+import { Constructor, EntityProperty, IEntityGenerator, IMigrator, IPrimaryKey, ISchemaGenerator, Primary } from '../typings';
 import { ExceptionConverter } from './ExceptionConverter';
 import { EntityManager } from '../EntityManager';
 import { Configuration } from '../utils/Configuration';
@@ -292,7 +292,15 @@ export abstract class Platform {
   }
 
   getSchemaGenerator(em: EntityManager): ISchemaGenerator {
-    throw new Error(`${this.constructor.name} does not use a schema generator`);
+    throw new Error(`${this.constructor.name} does not support SchemaGenerator`);
+  }
+
+  getEntityGenerator(em: EntityManager): IEntityGenerator {
+    throw new Error(`${this.constructor.name} does not support EntityGenerator`);
+  }
+
+  getMigrator(em: EntityManager): IMigrator {
+    throw new Error(`${this.constructor.name} does not support Migrator`);
   }
 
   processDateProperty(value: unknown): string | number | Date {

packages/knex/src/AbstractSqlPlatform.ts

@@ -27,6 +27,18 @@ export abstract class AbstractSqlPlatform extends Platform {
     return new SchemaGenerator(em as any); // cast as `any` to get around circular dependencies
   }
 
+  getEntityGenerator(em: EntityManager) {
+    // eslint-disable-next-line @typescript-eslint/no-var-requires
+    const { EntityGenerator } = require('@mikro-orm/entity-generator');
+    return new EntityGenerator(em);
+  }
+
+  getMigrator(em: EntityManager) {
+    // eslint-disable-next-line @typescript-eslint/no-var-requires
+    const { Migrator } = require('@mikro-orm/migrations');
+    return new Migrator(em);
+  }
+
   quoteValue(value: any): string {
     /* istanbul ignore if */
     if (Utils.isPlainObject(value)) {

tests/features/entity-generator/EntityGenerator.test.ts

@@ -1,4 +1,5 @@
 import { pathExists, remove } from 'fs-extra';
+import { MikroORM } from '@mikro-orm/core';
 import { DatabaseTable } from '@mikro-orm/knex';
 import { EntityGenerator } from '@mikro-orm/entity-generator';
 import { initORMMySql, initORMPostgreSql, initORMSqlite } from '../../bootstrap';
@@ -68,4 +69,9 @@ describe('EntityGenerator', () => {
     await orm.close(true);
   });
 
+  test('not supported [mongodb]', async () => {
+    const orm = await MikroORM.init({ type: 'mongo', dbName: 'mikro-orm-test', discovery: { warnWhenNoEntities: false } }, false);
+    expect(() => orm.getEntityGenerator()).toThrowError('MongoPlatform does not support EntityGenerator');
+  });
+
 });

tests/features/migrations/Migrator.mongo.test.ts

@@ -0,0 +1,10 @@
+import { MikroORM } from '@mikro-orm/core';
+
+describe('Migrator', () => {
+
+  test('not supported [mongodb]', async () => {
+    const orm = await MikroORM.init({ type: 'mongo', dbName: 'mikro-orm-test', discovery: { warnWhenNoEntities: false } }, false);
+    expect(() => orm.getMigrator()).toThrowError('MongoPlatform does not support Migrator');
+  });
+
+});

tests/features/schema-generator/SchemaGenerator.mongo.test.ts

@@ -1,11 +1,10 @@
 import { MikroORM } from '@mikro-orm/core';
-import { SchemaGenerator } from '@mikro-orm/knex';
 
 describe('SchemaGenerator', () => {
 
   test('not supported [mongodb]', async () => {
     const orm = await MikroORM.init({ type: 'mongo', dbName: 'mikro-orm-test', discovery: { warnWhenNoEntities: false } }, false);
-    expect(() => orm.getSchemaGenerator()).toThrowError('MongoPlatform does not use a schema generator');
+    expect(() => orm.getSchemaGenerator()).toThrowError('MongoPlatform does not support SchemaGenerator');
   });
 
 });