CODEWITHSUNDEEP
ember.js
Syl
Syl

Reputation: 3829

Find the class name of a relation from the instance of a model in ember JS

I have foo an instance of the ember-data model thing. thing.js has the following property :

owner: DS.belongsTo('user')

If I have foo with an empty owner, how can I, with only foo and the 'owner' string, retrieve the value 'user' representing the model of the owner relation?

EDIT: I want to allow my select-relation component to works with relations where the name is different from the class name

Upvotes: 1

Views: 135

Answers (3)

Chris
Chris

Reputation: 1074

This looks like a use case for typeForRelationship.

In your example you should be able to do something like

store.modelFor('thing').typeForRelationship('owner', store);

If you don't like that approach you can use the belongsTo reference API, where you use the meta data from the relationship to get the type

foo.belongsTo('owner').type

The only thing with that approach is that the type property may not be public API and possible (though unlikely) to change at some point.

Upvotes: 1

Syl
Syl

Reputation: 3829

It seems I can do the following :

this.get('model').get('_internalModel._relationships.initializedRelationships.'+this.get('relation')+'.relationshipMeta.type')

model being an instance and relation the string of the relation name, it correctly return the model of the relation.

EDIT : a better solution not using private API courtesy from the ember discord : 

function getRelatedModelName(record, relationName){
        let ParentModelClass = record.constructor;
        let meta  = get(ParentModelClass, 'relationshipsByName').get(relationName);
        return meta.type;
      }

Upvotes: 0

handlebears
handlebears

Reputation: 2276

It sounds like you have some work to do to finish setting up your relationships. Have a read through this page of the guides.

If the relationships are set up correctly, to get the associated user, you should be able to do foo.owner. This assumes that users are already present in the store. I recommend using the Ember Inspector browser plugin to debug the relationships.

Upvotes: 1

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