mikro-orm | TypeScript ORM for Node.js

by mikro-orm TypeScript Version: Current License: MIT

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TypeScript ORM for Node.js based on Data Mapper, Unit of Work and Identity Map patterns. Supports MongoDB, MySQL, MariaDB, PostgreSQL and SQLite databases.

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mikro-orm Key Features

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mikro-orm Examples and Code Snippets

Mikro-ORM still cascades while persisting even when deactivated

Lines of Code : 9

License : Strong Copyleft (CC BY-SA 4.0)

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concert.artists.add(new Artist({ "_id": new ObjectId("a"), "name": "" }))

// Use the mikro-orm findOne method from the entity manager
const artist = await artistRepository.findOne(Artist, { _id: new ObjectId('a')

Community Discussions

Trending Discussions on mikro-orm

Error: Cannot find module 'src/entities/Post'

NodeJs, Apollo, and typescript server hang on session storage

Validation Error: Using global entity manager instance methods for context specific actions is disallowed

OptionalProps in Mikro-orm

Why do I get `TypeError: Cannot set property length of # which has only a getter` error?

express-session crashes server on setting cookie?

Does MikroORM require a RequestContext when used with background workers like BullMQ?

error TS2416: Property 'originalError' in type 'ApolloError' is not assignable to the same property in base type 'GraphQLError'

Mikro-ORM: error: there is no parameter $1

Use EventSubscriber to register Database History in mikroorm

QUESTION

Error: Cannot find module 'src/entities/Post'

Asked 2022-Mar-14 at 08:42

so i am creating a graphQL server using type-graph and mikro-orm everything was fine till i got this error that says => Error: Cannot find module 'src/entities/Post' and that module exists as you can see in this picture: folder structure

and this is what the error looks like int the terminal: error in the terminal

by the way i am using script called watch: "tsc -w" to convert typescript into javascript.

this is a code example of my postResolver:

...

ANSWER

Answered 2022-Mar-14 at 08:42

Fastest way to solve it would be using relative imports (import { Post } from '../entities/Post') instead of absolute like you did.

Another way to satisfy node to keep using absolute paths, is adding the following to your tsconfig file. Note that you will need to add a path for every directory at 'src' level, you want to import.

Source https://stackoverflow.com/questions/71460164

QUESTION

NodeJs, Apollo, and typescript server hang on session storage

Asked 2022-Feb-21 at 18:33

I'm new to NodeJs, and I'm following the full-stack tutorial made by Ben Awad https://www.youtube.com/watch?v=I6ypD7qv3Z8&t=7186s.

After setting up my server and everything works fine. I added express-session for session storage and linked it with Redis using Redis-connect and Redis client.

This is my index.ts:

...

ANSWER

Answered 2022-Feb-21 at 18:33

The problem is redis. With newer versions it saves the keys differently.

If you want to use the same code as Ben, you have to use legacyMode:

Source https://stackoverflow.com/questions/71008811

QUESTION

Validation Error: Using global entity manager instance methods for context specific actions is disallowed

Asked 2022-Feb-15 at 13:12

Using TypeORM and getting this error:

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ANSWER

Answered 2022-Feb-15 at 11:01

I faced a similar issue today when I upgraded the mikrorm setup from v4 to v5. After doing some RnD, I found the following changes helped me solve the mentioned error.

In the config object which is passed to the MikroORM.init call, pass the following property

allowGlobalContext: true

Don't directly use em to create database entry. Instead use the following code

Source https://stackoverflow.com/questions/71117269

QUESTION

OptionalProps in Mikro-orm

Asked 2022-Feb-07 at 11:22

I am trying to work out how to define additional optional properties.

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ANSWER

Answered 2022-Feb-07 at 11:22

Probably the cleanest approach is via type argument on the base entity:

Source https://stackoverflow.com/questions/71013801

QUESTION

Why do I get `TypeError: Cannot set property length of # which has only a getter` error?

Asked 2022-Jan-08 at 14:23

I have a Nest app where I use (besides other stuff) Fastify, MikroORM and nest-mqtt (actually using it from a fork which fixes it for Nest 8).

Now, the problem lays in using both MikroORM and nest-mqtt: when both are imported in a module (MikroOrmModule.forRoot() and MqttModule.forRoot()), it throws the following error:

...

ANSWER

Answered 2022-Jan-08 at 14:23

@B4nan user at GitHub found the root of this issue: collections package patches some global Node objects like Map, Set, Array. The issue was already reported at mqttjs/MQTT.js#1392.

Last version without collections dependency is v4.2.8 and last commit without it is 8aa2f8d. Current workaround for me is to use that version until they remove collections from dependencies.

Update: There is a new PR that should remove collections dependency: mqttjs/MQTT.js#1396.

Update 2: The PR is already merged and mqtt@4.3.4 is working as expected.

Source https://stackoverflow.com/questions/70590670

QUESTION

express-session crashes server on setting cookie?

Asked 2022-Jan-07 at 22:05

Basically this other post Express-session does not set cookie? where I'm following Ben Awad's Fullstack Tutorial. The cookie gets created but the server crashes and this is the error

...

ANSWER

Answered 2021-Dec-15 at 23:33

I've had the same error. In my situation I was able to fix it by changing the redis client to ioredis(I was using redis).

Source https://stackoverflow.com/questions/70266672

QUESTION

Does MikroORM require a RequestContext when used with background workers like BullMQ?

Asked 2021-Dec-03 at 13:54

I'm using MikroORM with BullMQ workers. When MikroORM is used with Express apps, it requires a RequestContext in order to maintain unique identity maps for each request. I suspect the same is required when processing multiple jobs with the same BullMQ worker.

Has anyone else successfully combined these two libraries? Is it possible to automatically fork the Entity Manager when a worker starts a new job?

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ANSWER

Answered 2021-Dec-03 at 13:54

You can use @UseRequestContext() decorator for such cases. It will basically act as if the method would be executed after a middleware that adds the context. Note that to use it, this.orm needs to be the MikroORM instance.

Source https://stackoverflow.com/questions/70209851

QUESTION

error TS2416: Property 'originalError' in type 'ApolloError' is not assignable to the same property in base type 'GraphQLError'

Asked 2021-Nov-01 at 17:53

Versions

apollo-server-errors: 3.2.0
graphql: 15.6.1/ 15.7.0
nestjs-cli: 8.1.2
npm: 6.14.15
Typescript: 4.4.4

Error:

...

ANSWER

Answered 2021-Oct-31 at 01:23

Apparently, the type of GraphQLError.originalError was changed at some point from originalError?: Maybe to Error | undefined. Downgrading to graphql 15.3.0 solved this for me.

Source https://stackoverflow.com/questions/69740750

QUESTION

Mikro-ORM: error: there is no parameter $1

Asked 2021-Oct-14 at 14:51

Alright so I've been trying to search Mikro-ORM's docs to find how to pass in native sql query params in but I haven't been able to find anything. After playing with the code a bit this is what it looks like which I think is sort of right but I'm getting this error

...

ANSWER

Answered 2021-Oct-14 at 14:51

You need to use ? instead of $1 in the raw query. This is how knex, the underlying query builder, works.

Source https://stackoverflow.com/questions/69572525

QUESTION

Use EventSubscriber to register Database History in mikroorm

Asked 2021-Oct-13 at 09:06

I am fairly new to the concept of LifcycleHooks and EventSubscribers. I am trying to populate a history table that records the changes done on any other table. I have been trying to use EventSubscriber for this: The idea is that on the onFlush event trigger of my eventSubscriber, I am extracting all the changed values and fields from the changeset and creating an object of the history table and trying to persist it but I see the following error:

...

ANSWER

Answered 2021-Oct-13 at 09:06

You should not flush from inside any hook or event handler. Using flush events is correct, but instead of afterFlush you should use onFlush and append the newly added entities to current unit of work. That is exactly what the example in the docs shows.

https://mikro-orm.io/docs/lifecycle-hooks/#using-onflush-event

If you want to issue the query in parallel (not in the same transaction), you could either fork the EM to get around the validation error, or use em.nativeInsert() instead of UoW to create the new record.

Source https://stackoverflow.com/questions/69532925

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