I'm a newbie to Ember Data and I've just switched from FIXTURE data to the RESTAdapter but I don't know enough about how to connect the model and the API's call signature. Specifically I'd like to be able to call an endpoint GET /activities/[:user_id]/[:by_date]. This would load an array of "Activity" objects but only those for a given date.
Router:
this.resource('activities', { path: '/activities' }, function() {
this.route('by_date', {path: '/:user_id/:by_date'});
});
Route:
App.ActivitiesByDateRoute = Ember.Route.extend({
serialize: function(activity) {
return {
userId: 1,
dateBy: "2013-07-01"
};
}
});
First off I tried to hard code the values for userId and dateBy making the adjustments to the Route above. Sadly that did not work. I think I understand why -- although I don't have a quick way to fix this -- but more disturbing for me was that when I manually put in the parameters into the URL: http://restful.service.com/api/activities/1/2013-07-01. The results are quite surprising to me:
Initially the debugging messages suggest a success:
This however, is not correct as no network requests are actually made
If you reload the browser, it will now go out and get the Activities but to my surprise it also goes out to find the specified user. Hmmm. That's ok, the user 1 is pulled back successfully.
The Activity, however, is just a GET /activities call which fails because this endpoint needs the user and date qualifier to work. Why weren't these included in the request?
I don't think ember data supports "composite keys" (which is essentially what you are trying to do). You'd probably need to build your own Ajax for that specific model and implement it in the model hook for that specific route. You can always fetch the data and sideload it into ember-data if you'd like to have an ember data model.
Related
I am new to ember, so please treat me like a fool. What I'm trying to do first is to understand the concept.
In my application I heavily rely on few jQuery plugins they fetch new portion of data in their callbacks, that's how these plugins are designed, but I am not sure how can I trigger them to fetch a new portion of data from API passing to API updated query parameters after plugin has been rendered.
I have wrapped the plugin in a component, in component's template I send data to it as (I use emblem.js syntax here)
= plotly-chart chartData=model
In model I have
//app/models/data-points.js
import DS from 'ember-data';
export default DS.Model.extend({
// time: DS.attr(),
ch1: DS.attr(),
ch2: DS.attr(),
ch3: DS.attr(),
temperature: DS.attr(),
});
And then in component itself I fetch data
//app/components/plotly-chart.js
dataPoints: Ember.computed.map('chartData', function(item){
return item.getProperties('ch1', 'ch2', 'ch3', 'temperature');
}),
and make some manipulations with data, which isn't so important for the question itself.
Ah, and I have a route graph/ which later calls that component
//app/routes/graph.js
import Ember from 'ember';
export default Ember.Route.extend({
queryParams: {
start_timestamp: {
refreshModel: true
},
end_timestamp: {
refreshModel: true
}
},
model(params) {
return this.get('store').query('data-point', params);
}
});
So as you see I have tried to fetch new properties via query params, finally it works great if I just update the url in browser, but now can I trigger new call to API and fetch new data and get this new data in a component itself?
Also I'm struggling to understand what role controllers play in all of these. It is mentioned that controllers will be deprecated soon, but still used here https://guides.emberjs.com/v2.10.0/routing/query-params/
My code seems to work without controllers, so this is really confusing.
Also I suspect maybe I should use services for what I'm trying to achieve, but not sure how.
Ember experts, could you please point me into a right direction? The most important thing is how to fetch new portion of data from API with updated query parameters (query parameters to API itself, not nessesarely the ember application, but I suspect in ember-data it is the same thing? or not %) %) %)).
UPDATE 1
Really I should use services for that, shouldn't I? Pass arguments into a service and query a store there. Would that be a correct pattern?
Then query parameters in url are not the same as querying the store and is an independent thing. Am I right?
but how can I trigger new call to API and fetch new data and get this new data in a component itself?
If you change your queryParam values in a controller using an action (combined with your current route setup) it will adjust your route and re-call your API, as the values are bound together to make this particular use case simple :-) You're about 98% of the way there ... :-)
Re controllers going away, they won't for a long time as the replacement hasn't been worked out yet. You could do some of this in a service if you want to, but there is no need as you are almost done.
Thanks, that make sense though. I just worried I'm doing it wrong.
By they way finally I found a way to access store from the controller Access store from component but:
1. I was unable to take out the data from that variable, probably it's me being stupid.
2. I double it's the right way to access store directly in a component and better to use services for that or rely on “Data Down Actions Up” (DDAU) paradigm?
Finally I was able to fetch new portion of a data calling a controller's action from within the controller, but then the next problem raised - the data was updated, but the JS code did not know about that because I feed the jQuery plugin with this data and it did not pick up changes automatically. I think I might be doing it a wrong way there %)
But finally I get it working by adding an Ember's observer to that variable and in observer calling a redraw function (for chart in this particular place).
#acorncom Thanks!
--Using Ember Data 2.7.1--
I am trying to reverse the order of a collection of records without first turning them into an array using toArray(). This collection of objects comes from the promise returned by this.store.findAll('history-item').
I want to do this the ember way instead of making them plain javascript. I am getting a TypeError: internalModel.getRecord coming from record-array.js. For some reason when it is trying to do objectAtContent(), the content it is looking seems to not have a type. Through the stack trace I can see that the object I am dealing with is [Class], class being the history-item model. A few stack calls before the objectAtContent(), the object being dealt with switches from that history-item model to some other Class object that has no type attribute.
I am able to use Ember Inspector to see my data correctly, and if I just displayed the original collection of records on my template, it shows properly.
Has anyone run into this?
Some thoughts and considerations:
-Is there anything special about how findAll() works with its promise that doesn't allow for reversal since it is reloading in the background? I do want it to keep reloading live data.
-I am using ember-cli-mirage to mock my db and endpoints and I've follow the instructions to the letter I think. I am using an unconfigured JSONAPISerializer for mirage and and a unconfigured JSONAPIAdapter for ember. Could it have anything to do with metadata that is being sent from the back? Could it have something to with the models or records not being set up? Is there something special I have to do?
Route Segment that defines model and tries to reverse it:
[note: I know it may not be convention to prep the data (ordering) in the route but I just put it in here for ease of description. I usually do it outside in the controller or component]
model(){
return this.get('store').findAll('history-item').then(function(items){
return items.reverseObjects();
}).catch(failure);
History list model declaration:
export default DS.Model.extend({
question: DS.attr('string'),
answer: DS.attr('string')
});
Ember-Cli-Mirage config.js end points:
this.get('/history-items', (schema) => {
return schema.historyItems.all();
});
Ember-Cli-Mirage fixture for history-items:
export default [
{id: 1, question: "1is this working?", answer: "Of course!"}
}
Error:
TypeError: internalModel.getRecord coming from record-array.js
This issue also happens when I try to create a save a record. The save is successful but when the model gets reloaded (and tries to reverse), it fails with the same error. It doesn't matter if I the fixture or not.
Controller:
var newHistoryItem = this.store.createRecord('history-item', {
question: question,
answer: answer
});
newHistoryItem.save().then(success).catch(failure);
The result returned from store.findAll and store.query is an AdapterPopulatedRecordArray (live array), mutation methods like addObject,addObjects,removeObject,removeObjects,
unshiftObject,unshiftObjects,pushObject,pushObjects,reverseObjects,setObjects,shiftObject,clear,popObject,removeAt,removeObject,removeObjects,insertAt should not be used.
Have a look at corresponding discussion and
Proposed PR to throw error and suggestions to use toArray() to copy array instead of mutating.
I think using toArray is fine, no need to reinvent the wheel. Even Ember's enumerable/array methods are implemented using toArray under the hood.
I like keeping transforms on controllers/components, so Routes are only concerned with [URL -> data] logic. I think here I would keep the model hook returning the server data, and use a computed property on the controller:
import Ember from 'ember';
export default Ember.Controller.extend({
reversedItems: Ember.computed('model.[]', function() {
return this.get('model').toArray().reverse();
})
});
Twiddle: https://ember-twiddle.com/6527ef6d5f617449b8780148e7afe595?openFiles=controllers.application.js%2C
You could also use the reverse helper from Ember Composable Helpers and do it in the template:
{{#each (reverse model) as |item|}}
...
{{/each}}
I'm still a bit new to Ember. I'm using Ember 1.13 with Ember Data and the DS.RESTAdapter. For debugging purposes, as well as educational (such as getting a feel for how Ember Data works with various options such as the shouldReload* functions), I want to log every API request with mainly the URL called and optionally how it was called (eg, from a store.findAll() or store.queryRecord(), etc.). Is there a single place (my guess is somewhere in adapter:application?) where I can put a single console.log('URL called: ', url, ', from: ', callingFunction); that handles all of this?
If you use the JSONAPIAdapter or the RESTAdapter just override ajax() on the adapter to log the URI:
ajax(url, type, options) {
console.log(url);
return this._super(...arguments);
}
There is no easy way to get the caller function. Analyse the callstack, if its just for debugging purposes!
But, maybe just use the Browser log XMLHttpRequest option if its for debugging?!
If you want to know how it works, checkout the code. The adapter and the store is where you can look for knowledge.
I'm having some difficulty reloading my ember RESTful models, and I'm not sure why. Here's [conceptually] what I'm trying to do... http://jsbin.com/EfuBiNo/4/edit
The only difference between that code and my code is that I'm not using the FixtureAdapter, I'm using the RESTAdapter. Unfortunately, reloading my RESTful models is causing the number of records in the DS.RecordArray to double. So you can see the console is logging that (on every reload) there are two records in the RecordArray.
When I run this with my RestAdapter, the count goes 2...4...8...16....etc. So I'm not sure why it's doubling them every time, but if anybody has any insight on why -- or better yet, another way to reload these records -- I'd be very grateful. Thanks.
If you need to refresh a collection of records after you've already loaded them, you could do something like:
App.ThingsRoute = Ember.Route.extend({
model: function () {
return this.store.find('thing');
},
actions: {
refreshThings: function () {
var controller = this.controller;
this.store.find('thing').then(function (things) {
controller.set('content', things);
});
}
}
});
This will simply fetch all the things again and set the record array as the content on your controller whenever the promise resolves. If the items that come back are already catalogued in your store (the ids are already present) then you won't get a ton of duplicate records hanging around; stuff will just get updated. If there are new records that you didn't previously know about, then you'll get those now on your ThingsController.
This is also useful if you are doing some type of querying:
this.store.find('thing', {color: 'red'})
I have a backend resource that contains user activities and in the application I would like to present activities based on a single day's worth of activities. I have an ArrayController called ActivitiesController defined in the router like this:
this.resource('activities', { path: '/activities/:by_date' }, function() {
this.route('new');
});
The REST API provides the following GET method:
GET /activities/[by_date]
So far this looks pretty symmetrical and achievable but I'm running into two problems:
Parameterized array find. Typically a parameterized route would be serviced by a ObjectController but in this case the by_date parameter simply reduces/filters the array of activities but it's still an array that's returned. I'm not sure how to structure this in the model hook in the ActivitiesRoute so that its effectively doing a "findAll" rather than expecting a singular resultset.
Since functionality. As there is a reasonable network cost in bringing back these arrays of activities I would like to minimize this as much as possible and the REST API supports this by allowing for a since parameter to be passed along with the date of the last request. This way the server simply responds with a 304 code if no records have been updated since the last call and if there are new records only the new records are returned. Is there anyway to get this "out of the box" with ember-data? Does this require building a custom Adaptor? If so, are there any open source solutions that are available?
p.s. I was thinking that part of the answer to #2 might be to incorporate Alex Speller's Query Parameters: http://discuss.emberjs.com/t/query-string-support-in-ember-router/1962/48
What does your route's model hook look like? I am thinking something like this should work:
model: function(params) {
return this.store.find('activity', { by_date: params.by_date });
}