如何从firestore中的数组中删除对象 [英] How to delete object from array in firestore

问题描述

我在从 firestore 中的 Array 中删除 Object 时遇到问题.我在 firestore 中有这些数据:

I have a problem with deleting an Object out of an Array in firestore. I have this data in firestore:

现在我想删除例如 posts Array 中的第二个 Object.

And now I would like to delete e.g the second Object out of the posts Array.

代码:

 deletePic () {
  let docId = `${this.currentUser.uid}`

   fb.usersCollection.doc(docId).update({
     posts: firebase.firestore.FieldValue.arrayRemove()
   })
  .catch(function(error) {
      console.error("Error removing document: ", error);
  });
}

但是我不知道如何定义arrayRemove()

这些是图片，每一张都有一个删除按钮来删除图片.

These are the pictures and each one has a delete button to delete the picture.

推荐答案

警告不要使用我的解决方案，因为它已经超过 3 年了，现在有新的解决方案:https://stackoverflow.com/a/59745086/6668441 我的是纯 js 的，是一个糟糕的模式.

Warning Do not use my solution as it is more than 3 years old, nowadays there is new solution : https://stackoverflow.com/a/59745086/6668441 Mine was a pure js one and is a bad pattern.

你不能使用过滤器 ?然后将新的帖子数组返回到您的 fb.usersCollection 方法

Can't you use filter ? And then return the new posts array to your fb.usersCollection method

//deleteId is the id from the post you want to delete
posts.filter(post => post.id !== deleteId);

所以这应该是这样的:

 deletePic (deleteId) {
  let docId = `${this.currentUser.uid}`

   //deleteId is the id from the post you want to delete

   fb.usersCollection.doc(docId).update({
     posts: posts.filter(post => post.id !== deleteId);
   })
  .catch(function(error) {
      console.error("Error removing document: ", error);
  });
}

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