[英]Firebase queries "where contains a string"
I'm trying to do a "where" query in Flutter-Firebase to filter by name (if the object name is "Una casa roja" and the user writes "casa", the object must be returned).我正在尝试在 Flutter-Firebase 中执行“where”查询以按名称过滤(如果 object 名称为“Una casa roja”并且用户写入“casa”,则必须返回 object)。 I don't know who can I do the query.
我不知道我可以向谁查询。 I only have this, but is not what I am looking for:
我只有这个,但不是我要找的:
.where('nombre', isGreaterThanOrEqualTo: nombre, isLessThan: nombre + 'z')
Thanks!谢谢!
Firestore doesn't support text-search by default. Firestore 默认不支持文本搜索。 However, there are a few workarounds.
但是,有一些解决方法。
When you register a new user to your app you can store their username in firestore as an array that includes the possible ways you would search for a user (look at the attached image).当您将新用户注册到您的应用程序时,您可以将他们的用户名作为一个数组存储在 firestore 中,其中包括您搜索用户的可能方式(查看附件图像)。
You can do that by splitting the name string.您可以通过拆分名称字符串来做到这一点。
setSearchParameters(String name) {
List<String> searchOptions = [];
String temp = "";
for (int i = 0; i < name.length; i++) {
temp = temp + name[i];
searchOptions.add(temp);
}
return searchOptions;
}
Then you can query the users collection by searching in that array using arrayContains
like this:然后,您可以通过使用
arrayContains
在该数组中搜索来查询用户集合,如下所示:
await usersCollection
.where('searchOptions', arrayContains: searchText)
.get()
.then((value) =>
value.docs.map((doc) => User.fromSnapShot(doc)).toList());
This solution works for simple cases but if you need advanced search capabilities then you'll have to use a 3rd party service such as Agolia .此解决方案适用于简单的情况,但如果您需要高级搜索功能,则必须使用 3rd 方服务,例如Agolia 。
Unfortunately, You can't do this.不幸的是,你不能这样做。 Firebase documentation says that you can't do it.
Firebase 文档说你不能这样做。 I don't know why firebase doesn't support that.
我不知道为什么 firebase 不支持。 But to do that you can use third-party APIs such as Agolia or Elastic.
但要做到这一点,您可以使用第三方 API,例如 Agolia 或 Elastic。 For more information you can get it in their documentation in this link https://firebase.google.com/docs/firestore/solutions/search
有关更多信息,您可以在此链接https://firebase.google.com/docs/firestore/solutions/search的文档中获取它
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