NodeJS: How to do a many to many relation using Loopback4

Question

I'm building a blog API using the Loopback 4 framework and I didn't find in documentation or any article on the internet for how to do many to many relationships (Posts and Categories)

So my question is: How to do such a relation in LoopBack 4? and If not supported is there a workaround!

Also, another question, how to do a cascade ( update, insert ) and update on duplication using LoopBack 4?

I found your missing docs: loopback.io/doc/en/lb4/HasMany-relation.html :) — Ramesh Pareek
– Ramesh Pareek, Commented Apr 13, 2020 at 17:08
This is a one to many relations!!!! many to many is not on the loopback documentations — hesham shawky
– hesham shawky, Commented Apr 13, 2020 at 19:52

Rifa Achrinza · Accepted Answer · 2020-10-30 13:29:15Z

2

LoopBack 4 doesn't currently support hasAndBelongsToMany relation. You'll need to create your own junction table/Model using a hasManyThrough relation.

See the relevant GitHub issue: https://github.com/strongloop/loopback-next/issues/2308

edited Oct 30, 2020 at 13:29

answered Apr 16, 2020 at 0:12

Rifa Achrinza

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