gaperton
commented
7 years ago Model.from reference works very simply. It stores an id inside of model.attributes, which is replaced with the model on the first read attempt if the master collection is not empty. Thus, if you want to access the raw id, you could do:
console.log( order.attributes.customer );
// or, to make it 100% correct:
const Order = Model.extends({
defaults : {
customer : Model.from( '~customers' ),
// ...
},
properties : {
customer_id(){
const { customer } = this.attributes;
return typeof customer === 'object' ? customer.id : customer;
}
}
}Or, using the syntax from NestedTypes 2.0 RC:
@define
class Order extends Model {
static attributes = {
customer : Model.from( '~customers' ),
// ...
}
get customer_id(){
const { customer } = this.attributes;
return typeof customer === 'object' ? customer.id : customer;
}
}
far-blue
Where I have a model instance that has a reference, by Id, to another model in a Store, is there a way to get hold of the id itself rather than the model from the store? In particular, I am thinking of the following scenario:
We want to create a shared library of models that we use across multiple apps but we neither want all the model definitions loaded into every app or, of course, all the models and all their relationships fetched by every app. If we define an Order model with a reference to a Product model and a reference to a Customer model (as a simple example) then we don't always need to populate both the Product model and the Customer model in order to use the Order model - but we would still want to have access to the Customer Id and Product Id values. If you try to request a Customer when the instance of the Customer model doesn't exist in the store, for instance, you are given back 'undefined' so is there a way to return the Customer Id instead? I believe it is stored in a Refs structure internally?
If we had access to the Id values then we could setup all our models with references and make use of Stores and only populate the store collections we needed and then refer to Id values for those models not populated directly.