entityMap|blocks|key|5urc9|text|如Firestore中所述|type|unstyled|depth|inlineStyleRanges|entityRanges|data|jmmi|文档|d5is7|，目前还没有自动删除集合的操作。|d0es4|您需要获取所有文档，并循环遍历它们以删除每个文档。|5pb8h|firestore.collection('messages').getDocuments().then((snapshot)+{
++for+(DocumentSnapshot+doc+in+snapshot.documents)+{
++++doc.reference.delete();
++});
});|code-block|syntax|javascript|8eqq6|请注意，这只会删除|63u2r|集合。如果在此路径中有子集，它们将保留在Firestore中。文档还有一个云函数，还集成了一个可调用的函数，该函数使用Firebase命令行接口来帮助处理嵌套删除。^0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|R|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|S|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|T|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|U|9|@]|A|@]|B|$]]|$2|I|4|J|6|K|8|V|9|@]|A|@]|B|$L|M]]|$2|N|4|O|6|7|8|W|9|@]|A|@]|B|$]]|$2|P|4|Q|6|7|8|X|9|@]|A|@]|B|$]]]]

As stated in Firestore <a href="https://firebase.google.com/docs/firestore/solutions/delete-collections" rel="noreferrer">docs</a>, there isn't currently an operation that atomically deletes a collection.

You'll need to get all the documents, and loop through them to delete each of them.

<pre><code>firestore.collection('messages').getDocuments().then((snapshot) {
 for (DocumentSnapshot doc in snapshot.documents) {
 doc.reference.delete();
 });
});
</code></pre>

Note that this will only remove the <code>messages</code> collection. If there are subcollections in this path they will remain in Firestore. The docs also has a cloud function also integration with a Callable function that uses the Firebase Command Line Interface to help with dealing nested deletion.

entityMap|blocks|key|fl8ij|text|啊。第一个答案是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8rtql|几乎|fjkhq|正确。这个问题与dart中的map方法以及它如何与Futures一起工作有关。无论如何，尝试使用for循环，如下所示，您应该会做得很好：|79icb|firestore.collection('messages').getDocuments().then((snapshot)+{
++for+(DocumentSnapshot+ds+in+snapshot.documents){
++++ds.reference.delete();
++});
});|code-block|syntax|javascript^0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|L|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|M|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|N|9|@]|A|@]|B|$]]|$2|G|4|H|6|I|8|O|9|@]|A|@]|B|$J|K]]]]

Ah. The first answer is almost correct. The issue has to do with the map method in dart and how it works with Futures. Anyway, try using a for loop instead like so and you should be good:

<pre><code>firestore.collection('messages').getDocuments().then((snapshot) {
 for (DocumentSnapshot ds in snapshot.documents){
 ds.reference.delete();
 });
});
</code></pre>

entityMap|blocks|key|d10s9|text|逐个删除firestore集合中的所有文档：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|f4iq2|db.collection("users").document(userID).collection("cart")
++++.get().addOnCompleteListener(new+OnCompleteListener()+{
@Override
++++public+void+onComplete(@NonNull+Task+task)+{
++++++++if+(task.isSuccessful())+{
++++++++++++for+(QueryDocumentSnapshot+document+:+task.getResult())+{++++++++++++++++++++++++++++++++++
++++++++++++++++db.collection("users").document(userID).
++++++++++++++++++++collection("cart").document(document.getId()).delete();
++++++++++++}
++++++++}+else+{
++++++++}
++++}
});|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

Delete All Documents from firestore Collection one by one:

<pre><code>db.collection("users").document(userID).collection("cart")
 .get().addOnCompleteListener(new OnCompleteListener&lt;QuerySnapshot&gt;() {
@Override
 public void onComplete(@NonNull Task&lt;QuerySnapshot&gt; task) {
 if (task.isSuccessful()) {
 for (QueryDocumentSnapshot document : task.getResult()) { 
 db.collection("users").document(userID).
 collection("cart").document(document.getId()).delete();
 }
 } else {
 }
 }
});
</code></pre>

entityMap|blocks|key|ceb67|text|我认为这可能有助于在任何文档引用中使用多个集合|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3siqo|//+add+${documentReference}+that+contains+/+may+contains+the+${collectionsList}
_recursiveDeleteDocumentNestedCollections(
++++++DocumentReference+documentReference,+List+collectionsList)+async+{
++++//+check+if+collection+list+length+>+0
++++if+(collectionsList.length+>+0)+{
++++++//+this+line+provide+an+async+forEach+and+wait+until+it+finished
++++++Future.forEach(collectionsList,+(collectionName)+async+{
++++++++//+get+the+collection+reference+inside+the+provided+document
++++++++var+nfCollectionRef+=+documentReference.collection(collectionName);
++++++++try+{
++++++++++//+get+nested+collection+documents
++++++++++var+nestedDocuemtnsQuery+=+await+nfCollectionRef.getDocuments();
++++++++++//+loop+through+collection+documents+
++++++++++Future.forEach(nestedDocuemtnsQuery.documents,+(DocumentSnapshot+doc)+async+{
++++++++++++//+recursive+this+function+till+the+last+nested+collections+documents
++++++++++++_recursiveDeleteDocumentNestedCollections(
++++++++++++++++doc.reference,+collectionsList);
++++++++++++//+delete+the+main+document
++++++++++++doc.reference.delete();
++++++++++});
++++++++}+catch+(e)+{
++++++++++print('====================================');
++++++++++print(e);
++++++++++print('====================================');
++++++++}
++++++});
++++}
++}|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

I think this might help for multiple collections in any document reference

<pre><code>// add ${documentReference} that contains / may contains the ${collectionsList}
_recursiveDeleteDocumentNestedCollections(
 DocumentReference documentReference, List&lt;String&gt; collectionsList) async {
 // check if collection list length &gt; 0
 if (collectionsList.length &gt; 0) {
 // this line provide an async forEach and wait until it finished
 Future.forEach(collectionsList, (collectionName) async {
 // get the collection reference inside the provided document
 var nfCollectionRef = documentReference.collection(collectionName);
 try {
 // get nested collection documents
 var nestedDocuemtnsQuery = await nfCollectionRef.getDocuments();
 // loop through collection documents 
 Future.forEach(nestedDocuemtnsQuery.documents, (DocumentSnapshot doc) async {
 // recursive this function till the last nested collections documents
 _recursiveDeleteDocumentNestedCollections(
 doc.reference, collectionsList);
 // delete the main document
 doc.reference.delete();
 });
 } catch (e) {
 print('====================================');
 print(e);
 print('====================================');
 }
 });
 }
 }
</code></pre>

entityMap|blocks|key|ar5gq|text|在最新版本的firebase中，您可以执行以下操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|dre2e|_collectionReference.snapshots().forEach((element)+{
++++++++for+(QueryDocumentSnapshot+snapshot+in+element.docs)+{
++++++++++snapshot.reference.delete();
++++++++}
++++++});|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

In the latest version of the firebase, you can do following.
<pre><code>_collectionReference.snapshots().forEach((element) {
 for (QueryDocumentSnapshot snapshot in element.docs) {
 snapshot.reference.delete();
 }
 });
</code></pre>

entityMap|blocks|key|f8s9i|text|以防您不想使用stream+(因为它会一直删除，直到您取消订阅)。您可以使用将来的delete。下面是代码片段：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|a5bbb|final+collectionRef+=+FirebaseFirestore.instance.collection('collection_name');
final+futureQuery+=+collectionRef.get();
await+futureQuery.then((value)+=>+value.docs.forEach((element)+{
++++++element.reference.delete();
}));|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

In case, if you don't want to use stream (because it will keep deleting until you cancel the subscription). You can go with future delete. Here is the snippet:
<pre><code>final collectionRef = FirebaseFirestore.instance.collection('collection_name');
final futureQuery = collectionRef.get();
await futureQuery.then((value) =&gt; value.docs.forEach((element) {
 element.reference.delete();
}));
</code></pre>

entityMap|blocks|key|2f5ng|text|Firestore.instance.collection("chatRoom").document(chatRoomId).collection("chats").getDocuments().then((value)+{
++++++for(var+data+in+value.docs){
++++++++Firestore.instance.collection("chatRoom").document(chatRoomId).collection("chats")
++++++++++++.document(data.documentID).delete().then((value)+{
++++++++++Firestore.instance.collection("chatRoom").document(chatRoomId).delete();

++++++++});
++++++}
++++});|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript^0^^$0|$]|1|@$2|3|4|5|6|7|8|E|9|@]|A|@]|B|$C|D]]]]

<pre><code>Firestore.instance.collection(&quot;chatRoom&quot;).document(chatRoomId).collection(&quot;chats&quot;).getDocuments().then((value) {
 for(var data in value.docs){
 Firestore.instance.collection(&quot;chatRoom&quot;).document(chatRoomId).collection(&quot;chats&quot;)
 .document(data.documentID).delete().then((value) {
 Firestore.instance.collection(&quot;chatRoom&quot;).document(chatRoomId).delete();

 });
 }
 });
</code></pre>

I have a firestore database. My project plugins:

cloud_firestore: ^0.7.4
 firebase_storage: ^1.0.1

This have a collection "messages" with a multiple documents.
I need to delete all documents in the messages collection. But this code fail:

<pre><code>Firestore.instance.collection('messages').delete();
</code></pre>

but delete is not define

how is the correct syntax?

How to Delete all documents in collection in Firestore with Flutter

数据库

云函数

 我有一个火库数据库。我的项目插件： 云 _ firestore：^0.7.4 firebase _ 存储：^1.0.1 这有一个具有多个文档的集合"messages“。我需要删除消息集合中的所有文档。但是这段代码失败了： Firestore.instance.collection('messages').delete...

问如何在Firestore中删除收藏中的所有文档
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问如何在Firestore中删除收藏中的所有文档EN