Emberfire 3.x and hasMany Relationships

mosouth · September 20, 2020, 3:56pm

Hey Everyone,

I am in the process of upgrading from Ember 2.18 to the latest LTS. I am able to upgrade to ember 3.4 with ease. If I upgrade to 3.5, it appears emberfire 2.10 fails. All existing direction is to upgrade to emberfire 3.0.0-rc6.

Upgrading to emberfire 3.0.0-rc6 was easy enough, but I learned that emberfire 3.x no longer supports the “hasMany” or “many to many” relationship that ember has.

This is a severe limitation and really hinders my upgrade plans. I am using the Realtime Database and not Firestore.

How is everyone else dealing with this? I am assuming I am not the only one stuck on this problem. I would welcome feedback.

dknutsen · September 21, 2020, 3:46pm

Hi @mosouth, what do you mean by

emberfire 3.x no longer supports the “hasMany” or “many to many” relationship that ember has

With the preface that I haven’t used the 3.x release of emberfire yet it doesn’t seem that hasMany support has been dropped by looking at the documentation. That said the docs seem very WIP… But for example:

findHasMany is still documented on the realtime database adapter
the guides on Relationships mention hasMany used in multiple difference scenarios (that said everything else is just marked as TODO )
the migration guides do mention dropping embedded ids, but unfortunately the guides aren’t filled out beyond that to suggest what the right alternative would be

It might be worth asking in Discord as well, I would be very surprised if there aren’t a few people at least who have figured this out. I know @knownasilya opened up a few emberfire issues that sound related …

mosouth · September 21, 2020, 4:03pm

Thanks for the reply. I see a few issues reported similar to this one:

github.com/FirebaseExtended/emberfire

Many to many relationship is not queried correctly

opened 06:58AM - 16 Jul 19 UTC

closed 09:39PM - 04 Mar 22 UTC

charlesfries

pr welcome known issue

``` DEBUG: ------------------------------- DEBUG: Ember : 3.10.2 DEBUG: …Ember Data : 3.9.1 DEBUG: jQuery : 3.4.1 DEBUG: EmberFire : 3.0.0-rc.3 DEBUG: Firebase : 6.2.4 DEBUG: ------------------------------- ``` I have 2 models with a many-to-many relationship. models/club ``` import DS from 'ember-data'; const { Model, attr, hasMany } = DS; export default Model.extend({ members: hasMany('member'), title: attr('string') }); ``` models/member ``` import DS from 'ember-data'; const { Model, attr, hasMany } = DS; export default Model.extend({ clubs: hasMany('club'), name: attr('string') }); ``` First I make some example data. I create a `club`, save it, create a `member`, save it, and finally update `club.members` with the saved `member` and save the `club` again. ``` this.store.createRecord('club', { title: 'My Club' }).save().then(club => { let member = this.store.createRecord('member', { name: 'Bob' }); member.clubs.pushObject(club); member.save().then(savedMember => { club.members.pushObject(savedMember); club.save() }); }); ``` This yields the following in Firebase: ``` { clubs: { kSgSyqzFv3DPyXcvAOwe: { title: "My Club", members: ["LhOmwWMuynIuCMOLE3K5"] }, members: { LhOmwWMuynIuCMOLE3K5: { name: "Bob", clubs: ["kSgSyqzFv3DPyXcvAOwe"] } } ``` Everything is working fine at this point. However, when I go to find the created `club` and read its `members` property, the result is always an empty array. ``` this.store.findRecord('club', 'kSgSyqzFv3DPyXcvAOwe').then(club => { club.get('members').then(members => { console.log(members.firstObject); // always undefined }); }); ``` I would expect to see an array of `member` objects after that second promise fulfillment. What I am doing wrong?

That talk about hasMany not working. I’ll try asking in Discord. That is a great idea.

dknutsen · September 21, 2020, 4:07pm

Ah interesting I hadn’t seen that issue. That doesn’t seem to match up with the docs but it’s all very work in progress, and sounds like it doesn’t get enough resources so Hope someone on discord can be of help!

mosouth · September 21, 2020, 4:25pm

I suspect the docs are not maintained. There are a few mentions of many to many gaps in the Issues log. Thanks for the discord suggestion.

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Emberfire 3.x and hasMany Relationships

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