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JavaScript Ember.js Ember Data Relationships in Ember Data

Artem Syromiatnikov
Artem Syromiatnikov
4,706 Points
Posted by Artem Syromiatnikov
Artem Syromiatnikov
4,706 Points

LSSerializer throws an error

I was following the instructions exactly, re-watched the video twice and compared everything i could. Still, I get an exception:

localstorage_adapter.js:11 Uncaught TypeError: Cannot read property 'determineRelationshipType' of undefined
localstorage_adapter.js:11 DS.LSSerializer.DS.JSONSerializer.extend.serializeHasMany

I'm using Ember 1.7.0 and Ember Data : 1.0.0-beta.11.

Here are my models:

Blogger.Post = DS.Model.extend({
  title: DS.attr(),
  body: DS.attr(),
  comments: DS.hasMany('comment', {async: true})
});
Blogger.Comment = DS.Model.extend({
  text: DS.attr(),
  post: DS.belongsTo('post', {async: true})
});

Any help is highly appreciated.

4 Answers

Myers Carpenter
Myers Carpenter
6,421 Points

We solved this specific problem, but it's worth pointing out that the method of "search for the exact error message on google" method of debugging is too frequently overlooked and highly useful.

Myers Carpenter
Myers Carpenter
6,421 Points
Myers Carpenter
Myers Carpenter
6,421 Points

I have not played around this with this but searching for the exact error message ("Cannot read property 'determineRelationshipType' of undefined") turned up this stackover flow post which seems to suggest to use ember-data 1.0.0-beta.11 and ember-localstorage-adapter 0.5.0

Iain Simmons
MOD
Iain Simmons
Treehouse Moderator 32,305 Points
Iain Simmons
Iain Simmons
Treehouse Moderator 32,305 Points

So your models are in separate files?

Might be worth changing to the version of Ember Data being used in the videos: Ember Data : 1.0.0-beta.9, just to be on the safe side...

Artem Syromiatnikov
Artem Syromiatnikov
4,706 Points
Artem Syromiatnikov
Artem Syromiatnikov
4,706 Points

Yep, my models are in separate files. I've changed Ember data version to beta 9, but the errors remains so far.

jason chan
jason chan
31,009 Points
jason chan
jason chan
31,009 Points

kind of weird that it doesn't work on chrome, but it works on firefox? Then again it also might be cache error. Clear cache. Everytime you try something new.

Myers Carpenter
Myers Carpenter
6,421 Points

So, you are trying the same thing as the original poster and getting different results in firefox vs chrome?