Aurelia iterate over map where keys are strings - aurelia

Question

I'm having trouble getting Aurelia to iterate over a map where the keys are strings (UUIDs).
Here is an example of the data I'm getting from an API running somewhere else:
my_data = {
"5EI22GER7NE2XLDCPXPT5I2ABE": {
"my_property": "a value"
},
"XWBFODLN6FHGXN3TWF22RBDA7A": {
"my_property": "another value"
}
}
And I'm trying to use something like this:
<template>
<div class="my_class">
<ul class="list-group">
<li repeat.for="[key, value] of my_data" class="list-group-item">
<span>${key} - ${value.my_property}</span>
</li>
</ul>
</div>
</template>
But Aurelia is telling me that Value for 'my_data' is non-repeatable.
I've found various answer by googling, but they have not been clearly explained or incomplete. Either I'm googling wrong or a good SO question and answer is needed.

Answer 1

As another resource to the one supplied by ry8806, I also use a Value Converter:
export class KeysValueConverter {
toView(obj) {
if (obj !== null && typeof obj === 'object') {
return Reflect.ownKeys(obj).filter(x => x !== '__observers__');
} else {
return null;
}
}
}
It can easily be used to do what you're attempting, like this:
<template>
<div class="my_class">
<ul class="list-group">
<li repeat.for="key of my_data | keys" class="list-group-item">
<span>${key} - ${my_data[key]}</span>
</li>
</ul>
</div>
</template>

Answer 2

The easiest method would be to convert this into an array yourself (in the ViewModel code)
Or you could use a ValueConverter inside repeat.for as described in this article Iterating Objects
The code...
// A ValueConverter for iterating an Object's properties inside of a repeat.for in Aurelia
export class ObjectKeysValueConverter {
toView(obj) {
// Create a temporary array to populate with object keys
let temp = [];
// A basic for..in loop to get object properties
// https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Statements/for...in
for (let prop in obj) {
if (obj.hasOwnProperty(prop)) {
temp.push(obj[prop]);
}
}
return temp;
}
}
/**
* Usage
* Shows how to use the custom ValueConverter to iterate an objects properties
* aka its keys.
*
* <require from="ObjectKeys"></require>
* <li repeat.for="prop of myVmObject | objectKeys">${prop}</li>
*/
OR, you could use the Aurelia Repeat Strategies provided by an Aurelia Core Team member
You'd have to import the plugin into your app.
Then you'd use it using the pipe syntax in your repeat.for....like so....
<div repeat.for="[key, value] of data | iterable">
${key} ${value.my_property}
</div>