Using Angular to bind data from dictionaries to objects

Within my Angular framework, I am managing several collections. One of these is a global 'product attribute' dictionary:

attributes : [
    {id:1, value:"red", type:"color"}, 
    {id:2, value:"green", type:"color"}, 
    {id:3, value:"big", type:"size"}
]

Additionally, I have a 'product' object:

cars : [{
    name : "red big car",
    attributes : [1, 3] # referencing ids in the 'attributes' list
}]

Now, in my template, I aim to easily access this data:

<div ng-repeat='car in cars'>
    <p>{{ car.name }}</p>
    <p ng-repeat='attribute in attributes'>{{ attribute.value }}</p>
</div>

This code will yield:

<div ng-repeat='car in cars'>
    <p>red big car</p>
    <p ng-repeat='attribute in attributes'>red</p>
    <p ng-repeat='attribute in attributes'>big</p>
</div>

I understand that manually copying all attribute data to each 'car' object would result in redundant copies. Do you have any alternative suggestions? Thanks in advance :)

Answer №1

In cases where there is no straightforward mathematical formula to calculate array indices based on IDs (similar to the current example where indexes are ID-1), a lookup table can be created. This table will map array index values to IDs in a manner similar to how databases often operate:

$scope.lookup = {1:0,
                 2:1,
                 3:2 }

This lookup table can then be used to translate the car attributes array indexes into corresponding indices within the attributes array:

<div ng-repeat='car in cars'>
    <p>{{ car.name }}</p>
   {{car.attributes}}
   <p ng-repeat='indx in car.attributes'>{{attributes[lookup[indx]].value }}</p>
</div>

Example on jsfiddle

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