If I have an ember model say Person with attributes like name, age, height, address etc, and I want to fetch all records in the model but only want name attribute in returned JSON (name is the only param needed, so no need to return all params of the model), then is there a way in Ember to do that? I searched for the query methods on Ember store but was not able to see any such example.
Thanks in advance.
You can try with
const listOfName = this.get('store').findAll('Person').mapBy('name')
For details refer
mapBy
Related
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
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.
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.
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;
}
So in rails we could find a record by name, id etc, similarly i want to do in ember without making a server request
I have a model called person{id, name}. If i want to peek a record by id i do this:
this.get('store').peekRecord('person', id)
which gives me the record based on id, but now i want to peek a record with a particular name, i tried something like this:
this.get('store').peekRecord('person', {name: "testname"})
which dose not seem to work.
i need a way peek a record using just the name
You can only peekRecord using the unique identifier for the model, which is id property. If you do want to make a request then queryRecord is what you want. but you don't want to make a request so the only choice is peekAll and filter the result,
let allRecord = this.get('store').peekAll('person');
let filteredResult = allRecord.filterBy('name','testname');
//filteredResult is an array of matching records
In my Ember.js Application, I am dealing with query params for list updates. I have one strange use case, in which I don’t the URL to be updated with certain query params. How can I achieve this?
I assume you want to reload your model with parameters that are different than the ones in your application route? And you keep your application route parameters synced using queryParams?
In your route's model function you can filter your model data by the same query params (that appear in the address bar) but you can add some logic that extracts additional parameters either from the controller or other place and these parameters the data fetching query. Example:
model: function(queryParams) {
var params = queryParams;
params.additional_filter = this.controllerFor('mycontroller').get('additional_filter');
return this.store.find('mymodel', params);
}
Also if you want to explicitly reload the model you will need to call Router.refresh() function.
I have posts model where i need to load batch of replies on demand, and be able to load more. How can i do something like this? Is there a way to use ember-data store.find based on the parent model to have a resource like /posts/:post_id/replies?page=1
Any ideas if this is possible in ember-data?
You can pass options to store.find that will be passed on to your server. You could do something like this:
store.find('reply',{ post_id : post.get('id'), page : 1 })
Assuming the post variable has an id of 1, that would result in a call to:
/replies?post_id=1&page=1
I was wondering what is the correct approach,
Do I create HiddenInput fields in my ModelForm and from the
View I pass in the primaryKey for the models I am about to edit into
the hiddenInput fields and then grab those hiddenInput fields from
the AJAX script to use it like this?
item.load(
"/bookmark/save/" + hidden_input_field_1,
null,
function () {
$("#save-form").submit(bookmark_save);
}
);
Or is there is some more clever way of doing it and I have no idea?
Thanks
It depends upon how you want to implement.
The basic idea is to edit 1. you need to get the existing instance, 2. Save provided information into this object.
For #1 you can do it multiple ways, like passing ID or any other primary key like attribute in url like http://myserver/edit_object/1 , Or pass ID as hidden input then you have to do it through templates.
For #2, I think you would already know this. Do something like
inst = MyModel.objects.get(id=input_id) # input_id taken as per #1
myform = MyForm(request.POST, instance=inst)
if myform.is_valid():
saved_inst = myform.save()
I just asked in the django IRC room and it says:
since js isn't processed by the django template engine, this is not
possible.
Hence the id or the object passed in from django view can't be accessed within AJAX script.