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Flutter Firestore 更新文档

[英]Flutter Firestore update Documents

原文 2021-03-20 12:00:45 5 1 firebase/ flutter/ random/ google-cloud-firestore/ crud

I have an App where the user can buy Tickets.我有一个应用程序，用户可以在其中购买门票。 And in Firestore the Tickets are represented by documents so each ticket has it's own document.在 Firestore 中，工单由文档表示，因此每张工单都有自己的文档。 What I want to do is when the user wants to buy 5 Tickets I need a way to pick 5 random documents where the status is available and set them to sold.我想要做的是当用户想要购买 5 张门票时，我需要一种方法来选择 5 个状态可用的随机文档并将它们设置为已售出。 Is there a specific way to do that?有没有具体的方法可以做到这一点？

1 个解决方案

You can retrieve 5 random tickets with a Firestore-query with.limit(5) in a list.您可以使用 Firestore 查询 with.limit(5) 在列表中检索 5 张随机票。 After that you can loop to the list and get the id of each ticket and update each ticket to status "sold".之后，您可以循环到列表并获取每张票的 id 并将每张票更新为状态“已售出”。

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Flutter：firestore文件的futurebuilder - Flutter: futurebuilder of firestore documents

努力使用 flutter 云 Firestore 一次更新多个文档 - Struggling to Update multiple documents at once with flutter cloud Firestore

如何使用 flutter 更新 Firestore 中所有文档的单个字段？ - How to update a single field of all documents in firestore using flutter?

Flutter 和 Firestore：如何从集合组更新多个特定文档 - Flutter and Firestore: How to update multiple specific documents from collection group

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更新 Firestore 中的所有文档 - Update all documents in Firestore

Flutter Firestore 更新在哪里 - Flutter Firestore Update Where

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在 Flutter 中的嵌套集合中查询 Firestore 文档 - Query Firestore documents inside a nested collection in Flutter

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相关问题 Firestore 和 flutter：当字段为 null 时更新文档 - Firestore and flutter: update documents when a field is null Flutter：firestore文件的futurebuilder - Flutter: futurebuilder of firestore documents 努力使用 flutter 云 Firestore 一次更新多个文档 - Struggling to Update multiple documents at once with flutter cloud Firestore 如何使用 flutter 更新 Firestore 中所有文档的单个字段？ - How to update a single field of all documents in firestore using flutter? Flutter 和 Firestore：如何从集合组更新多个特定文档 - Flutter and Firestore: How to update multiple specific documents from collection group 遍历集合中的所有firestore文档并在flutter中更新它们 - Loop through all firestore documents in a collection AND update them in flutter 更新 Firestore 中的所有文档 - Update all documents in Firestore Flutter Firestore 更新在哪里 - Flutter Firestore Update Where 如何按firestore flutter中的字段内容订购文档 - How to order documents by a field content in firestore flutter 在 Flutter 中的嵌套集合中查询 Firestore 文档 - Query Firestore documents inside a nested collection in Flutter

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