更新含有陣列欄位的 Firestore 文件

更新含有陣列欄位的 Firestore 文件。

深入探索

如需包含此程式碼範例的詳細說明文件，請參閱以下文件：

程式碼範例

C#

如要向 Firestore 進行驗證，請設定應用程式預設憑證。詳情請參閱「為本機開發環境設定驗證機制」。

DocumentReference washingtonRef = db.Collection("cities").Document("DC");

// Atomically add a new region to the "regions" array field.
await washingtonRef.UpdateAsync("Regions", FieldValue.ArrayUnion("greater_virginia"));

// Atomically remove a region from the "regions" array field.
await washingtonRef.UpdateAsync("Regions", FieldValue.ArrayRemove("east_coast"));

Java

如要向 Firestore 進行驗證，請設定應用程式預設憑證。詳情請參閱「為本機開發環境設定驗證機制」。

DocumentReference washingtonRef = db.collection("cities").document("DC");

// Atomically add a new region to the "regions" array field.
ApiFuture<WriteResult> arrayUnion =
    washingtonRef.update("regions", FieldValue.arrayUnion("greater_virginia"));
System.out.println("Update time : " + arrayUnion.get());

// Atomically remove a region from the "regions" array field.
ApiFuture<WriteResult> arrayRm =
    washingtonRef.update("regions", FieldValue.arrayRemove("east_coast"));
System.out.println("Update time : " + arrayRm.get());

Node.js

如要向 Firestore 進行驗證，請設定應用程式預設憑證。詳情請參閱「為本機開發環境設定驗證機制」。

// ...
const washingtonRef = db.collection('cities').doc('DC');

// Atomically add a new region to the "regions" array field.
const unionRes = await washingtonRef.update({
  regions: FieldValue.arrayUnion('greater_virginia')
});
// Atomically remove a region from the "regions" array field.
const removeRes = await washingtonRef.update({
  regions: FieldValue.arrayRemove('east_coast')
});

// To add or remove multiple items, pass multiple arguments to arrayUnion/arrayRemove
const multipleUnionRes = await washingtonRef.update({
  regions: FieldValue.arrayUnion('south_carolina', 'texas')
  // Alternatively, you can use spread operator in ES6 syntax
  // const newRegions = ['south_carolina', 'texas']
  // regions: FieldValue.arrayUnion(...newRegions)
});

PHP

如要向 Firestore 進行驗證，請設定應用程式預設憑證。詳情請參閱「為本機開發環境設定驗證機制」。

$cityRef = $db->collection('samples/php/cities')->document('DC');

// Atomically add a new region to the "regions" array field.
$cityRef->update([
    ['path' => 'regions', 'value' => FieldValue::arrayUnion(['greater_virginia'])]
]);

// Atomically remove a region from the "regions" array field.
$cityRef->update([
    ['path' => 'regions', 'value' => FieldValue::arrayRemove(['east_coast'])]
]);

Python

如要向 Firestore 進行驗證，請設定應用程式預設憑證。詳情請參閱「為本機開發環境設定驗證機制」。

city_ref = db.collection("cities").document("DC")

# Atomically add a new region to the 'regions' array field.
city_ref.update({"regions": firestore.ArrayUnion(["greater_virginia"])})

# // Atomically remove a region from the 'regions' array field.
city_ref.update({"regions": firestore.ArrayRemove(["east_coast"])})

Ruby

如要向 Firestore 進行驗證，請設定應用程式預設憑證。詳情請參閱「為本機開發環境設定驗證機制」。

city_ref = firestore.doc "#{collection_path}/DC"

# Atomically add a new region to the 'regions' array field.
city_ref.update({ regions: firestore.field_array_union("greater_virginia") })

# Atomically remove a region from the 'regions' array field.
city_ref.update({ regions: firestore.field_array_delete("east_coast") })

後續步驟

如要搜尋及篩選其他 Google Cloud 產品的程式碼範例，請參閱 Google Cloud 範例瀏覽器。