How can one effectively outline the structure of a document within firestore?

Question

How can one effectively outline the structure of a document within firestore?

Currently, I am enclosing my calls to Firebase within a function so that I can specify the return type within the function. This allows me to define the type of data being retrieved from a document. However, TypeScript complains if you do not convert the Firebase call to 'unknown' before converting it into the desired interface. Is there a more efficient way to accomplish this?

For example:

async function getAllPartials() {
    const partialDocs = await db.collection('partials').get();
    return partialDocs.docs.map(d => d.data()) as unknown as Array<Partial>;
}

I also attempted the following approach:

async function getAllPartials() {
    const partialDocs = await db.collection<Partial>('partials').get();
    return partialDocs.docs.map(d => d.data());
}

This resulted in an error message stating: "Expected 0 type arguments but got 1;"

typescript firebase

Answer 1

Answer №1

After searching on various platforms, I finally found the solution to my problem. For those facing similar struggles, here is the code snippet that helped me:

async function fetchRecords<T>(name: string): Promise<Array<T>> {
  const documents = await db.collection(name).get();
  return documents.docs.map(doc => doc.data() as T);
}

The 'T' in this function represents a generic type that determines the structure of the objects within the collection. You can use this function by calling it like so:

const items = await fetchRecords<Item>('items');

It would have been more convenient if Google allowed us to pass the argument directly to the collection method, for example:

db.collection<Item>('item');

Unfortunately, that approach does not yield the desired results.

Answer 2

After searching on various platforms, I finally found the solution to my problem. For those facing similar struggles, here is the code snippet that helped me:

async function fetchRecords<T>(name: string): Promise<Array<T>> {
  const documents = await db.collection(name).get();
  return documents.docs.map(doc => doc.data() as T);
}

The 'T' in this function represents a generic type that determines the structure of the objects within the collection. You can use this function by calling it like so:

const items = await fetchRecords<Item>('items');

It would have been more convenient if Google allowed us to pass the argument directly to the collection method, for example:

db.collection<Item>('item');

Unfortunately, that approach does not yield the desired results.

How can one effectively outline the structure of a document within firestore?

Answer №1

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