feat: add InjectMikroORMs inject decorator (#192)

README.md

@@ -407,6 +407,17 @@ export class PhotoService {
 }
 ```
 
+You can use the `@InjectMikroORMs` decorator to get all registered MikroORM instances:
+
+```typescript
+@Injectable()
+export class MyService {
+
+  constructor(@InjectMikroORMs() private readonly orms: MikroORM[]) { }
+
+}
+```
+
 ## Testing
 
 The `nestjs-mikro-orm` package exposes `getRepositoryToken()` function that returns prepared token based on a given entity to allow mocking the repository.

src/mikro-orm.common.ts

@@ -20,6 +20,13 @@ export const getMikroORMToken = (name: string) => `${name}_MikroORM`;
  */
 export const InjectMikroORM = (name: string) => Inject(getMikroORMToken(name));
 
+/**
+ * Injects the MikroORMs provider.
+ *
+ * @returns A decorator which will cause NestJS to inject the MikroORMs provider.
+ */
+export const InjectMikroORMs = () => Inject('MikroORMs');
+
 /**
  * Gets the injection token based on context name for the relevant EntityManager provider.
  * @param name The context name of the database connection.

src/multiple-mikro-orm.middleware.ts

@@ -1,10 +1,11 @@
 import { RequestContext, type MikroORM } from '@mikro-orm/core';
-import { Inject, Injectable, type NestMiddleware } from '@nestjs/common';
+import { Injectable, type NestMiddleware } from '@nestjs/common';
+import { InjectMikroORMs } from './mikro-orm.common';
 
 @Injectable()
 export class MultipleMikroOrmMiddleware implements NestMiddleware {
 
-  constructor(@Inject('MikroORMs') private readonly orm: MikroORM[]) {}
+  constructor(@InjectMikroORMs() private readonly orm: MikroORM[]) {}
 
   use(req: unknown, res: unknown, next: (...args: any[]) => void) {
     RequestContext.create(this.orm.map(orm => orm.em), next);