How do I use dot notation to map into a value?

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await t.set(itemDoc, {
    ['${order.catalogType}.item']: admin.firestore.FieldValue.arrayUnion(item)
}, {merge: true})

this doesn't work. I am trying to have the variable order.CatalogType.item, the order.catalogtype is the variable and the item is the array name. item should be a string. when updating, firestore does the entire ${order.catalogType}.item. if I remove the ${} and just use order.catalogType.item, I get Chicken.item instead of mapping into the chicken and updating the item, it just creates a whole new object called Chicken.item ... is there a way to map a string and var?

google-cloud-firestore firebase javascript
1 Answers

With JavaScript, you need to use backtick quotes if you want a variable to be interpolated into a string.

await t.set(itemDoc, {
    [`${order.catalogType}.item`]: admin.firestore.FieldValue.arrayUnion(item)
}, {merge: true})
user_8071260
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