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Add example for Cloud Firestore #268

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@shoNagai shoNagai commented May 8, 2021

DataLoader is a great feature.
I'm using Cloud Firestore, and I've thrown in a pull request to add sample documentation, which I hope will increase the number of Cloud Firestore use cases.

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linux-foundation-easycla bot commented May 8, 2021

CLA Signed

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benjie
benjie previously requested changes May 10, 2021
.collection(`users`)
.where(admin.firestore.FieldPath.documentId(), `in`, keys)
.get();
return snapshot.docs.map((doc) => ({ ...doc.data(), id: doc.id }));
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Does firestore guarantee the results will be in the same order as the keys input? If you're not sure this is the case, I think it might be safer if this line was something like:

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return snapshot.docs.map((doc) => ({ ...doc.data(), id: doc.id }));
return keys.map(key => {
const doc = snapshot.docs.find(doc => doc.id === key);
return doc ? { ...doc.data(), id: doc.id } : null;
});

(Obviously test this works before adopting it; I've never used Firestore.)

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@benjie
Thank you for your review.

As you said, firestore is retrieved in ascending order by document ID by default, so I think sorting by input key is necessary.

I have added the correction and comments.

I have also implemented and confirmed the test in my repository.

@shoNagai shoNagai requested a review from benjie June 3, 2021 13:04
@benjie benjie removed their request for review June 3, 2021 13:15
@benjie benjie dismissed their stale review June 3, 2021 13:15

Changes made

@saihaj saihaj mentioned this pull request Mar 11, 2022
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@saihaj saihaj requested a review from benjie March 25, 2022 03:05
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benjie commented Mar 25, 2022

@saihaj Alas I use neither DataLoader nor Firestore so cannot really review the PR.

@benjie benjie removed their request for review March 25, 2022 11:02
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2 participants