How to Update a Specific Item in an Array Field in Firestore?

Updating an Item in an Array Field in Firestore

When working with array fields in Firestore, you may encounter situations where you need to update individual items within the array.

Initial Approach

Your initial attempt to update a field within an item array using nested pathing did not work because Firestore does not support direct updates to array elements. Instead, it only allows for updates to the entire array.

Alternative Approach

To update a field within an item array, you can use the following steps:

1. Read the entire array from the document into memory.
2. Modify the array in memory by updating the desired field.
3. Update the entire array field with the modified array.

This approach allows you to make changes to individual elements while maintaining the array's integrity.

Example:

In your specific scenario, to update items[0].meta.description from "hello world" to "hello bar", you would:

// Read the entire items array
const items = await design.get().data().items;

// Modify the array in memory
items[0].meta.description = "hello bar";

// Update the entire items array
await design.update({
  items: items
});

This solution allows you to update the desired field while keeping the array structure intact.

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