canjs/canjs

We CAN build the impossible! https://codepen.io/justinbmeyer/pen/yEGGoK

Gregg Roemhildt

@roemhildtg

I'm passing an object to a component that has a .optionsPromise property

So I can pass either options or optionsPromise

canjs/canjs#3427

Frank Lemanschik

@frank-dspeed

https://www.npmjs.com/package/landscaper should be moved to a public accessible place so that some one can work more easy with it :)

AntonProkofyev

@AntonProkofyev

Hi guys, i have a question
i have simple connect like
let userConnection = connect( [url, constructor], { url: { getData: 'GET /user' } });
which returns someting like {name: 'Name'}

i have wm

let AppViewModel = DefineMap.extend( {    
    user: {
        get: function (lastSetValue, resolve) {
            userConnection .get().then(resolve);
        }
    }
});

let appVM = new AppViewModel({});

i'm using simple template like {{user.name}}. But when i get response i can see name but i can also see
Uncaught (in promise) TypeError: Cannot define property _instanceDefinitions, object is not extensible define-helpers.js:17.
Am i doing anything wrong with asynchronous getters? May be someone know why is this error appears?

Frank Lemanschik

@frank-dspeed

ithink its because user.name

is not a property

but my english is to bad to explain you that better and shorter simply wait for some one but it looks like your doing it wrong

AntonProkofyev

@AntonProkofyev

mmm i got response {name: 'Name'} from the server and i see Name on the page

Kevin Phillips

@phillipskevin

can you put a breakpoint in define-helpers and see what property is being set?

Frank Lemanschik

@frank-dspeed

i can't tell you more i never used it like you do

with the lastSetValue and resolve

i return the value and i get the value

Kevin Phillips

@phillipskevin

take a look at canjs/can-route#98

see if it is the same thing you are doing @AntonProkofyev

Frank Lemanschik

@frank-dspeed

@phillipskevin couldn't he directly return the promis and don't use resolve?

i think he could simply return userConnection.get() ?

Kevin Phillips

@phillipskevin

he could, but it would make the template more complicated

and not fix this problem

Frank Lemanschik

@frank-dspeed

why would that affect the template

i always return pormis

and get directly the value

Kevin Phillips

@phillipskevin

you have to do user.value.name in the template

AntonProkofyev

@AntonProkofyev

mmm let me check

Frank Lemanschik

@frank-dspeed

hmmm i always do this each stuff for user.value

Kevin Phillips

@phillipskevin

@AntonProkofyev the way your code is, user.name is fine

Frank Lemanschik

@frank-dspeed

and that works great

Kevin Phillips

@phillipskevin

you can do it that way, @frank-dspeed

Frank Lemanschik

@frank-dspeed

then i have no value when i use his code style

interristing

Kevin Phillips

@phillipskevin

using the async getter with resolve, you don't have to do it that way

user is the value if you use resolve

Frank Lemanschik

@frank-dspeed

but then i can also do no waiting like if isResolved right?

because i only get the value

i understand the diffrence is getting a promis or a value i understand

Kevin Phillips

@phillipskevin

right

Frank Lemanschik

@frank-dspeed

do you know a code that would allow me to change the value every x secunds?

Kevin Phillips

@phillipskevin

I usually do promises like this:

    userPromise: {
        get: function () {
            return userConnection.get();
        }
    },
    user: {
        get: function(last, resolve) {
            this.userPromise.then(resolve);
        }
    }

so you can do userPromise.isResolved and also user.name

in the template

Frank Lemanschik

@frank-dspeed

ah nice now i understand

why this is in some examples

i saw that :)

AntonProkofyev

@AntonProkofyev

yep that's what i saw in docs and i can see name when it's resolved...
i've add breakpoint but it gives nothing. just see that Object.defineProperty(map, "_instanceDefinitions", { make an error
and that map constructor is DefineMap

Frank Lemanschik

@frank-dspeed

but do you know a way to reset a value with a interval?

Kevin Phillips

@phillipskevin

@frank-dspeed use a setter

Frank Lemanschik

@frank-dspeed

how you mean that?

i have really no idea about that because for me a setter gets only called on set

and then you mean i can do var x = interval() in the setter

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