I am looking for an example nodejs app that uses the sequelize ORM.
My main concern is that it seems next to impossible to define your models in separate js files if those models have complex relationships to one another because of require() dependency loops. Maybe people define all their models in one file that is very very long?
I am mainly interested in how the models are defined and use through out the app. I would like to have some validation that what i am doing on my own is the "good" way to do things.
The trick in this case is not to initialize the model in the file but just to provide the necesary information for its initialization and let a centralized module take care of the models setup and instantiation.
So the steps are:
requireon your model files, load the models from the singleton instead.
Here is a more detailed description of this solution with the corresponding source code:
It's old and limited in many ways!
First, as @jinglesthula mentioned in comments (and I experienced it too) - there are problems with requiring those files. It's because
require doesn't work the same way as
Second - you are very limited in relations - the code doesn't provide options to those associations so you are UNABLE to create
belongsToMany as it needs
through property. You can make the most basic assocs.
Third - you are very limited in model relations! If you read closely the code, you will see that relations is an Object instead of an Array, so if you want to make more than one associations of the same type (like having two times
belongsTo) - you cannot!
Fourth - You don't need that singleton thingy. Every module in nodejs is singleton by itself, so all this makes is pretty complex for no reason.
You should see Farm's answer! (The link to the article is broken, but I'll fix it with this official sample from sequelize: https://github.com/sequelize/express-example/blob/master/models/index.js - you can browse the whole project to get an idea of what's going on).
p.s. I'm editing this post as it's so upvoted that people won't even see any new answers (as I did).
Edit: Just changed the link to a copy of the same post, but in a Github Page