用于将树分支从集合移动到另一个集合的Firebase API [英] Firebase API for moving a tree branch from a collection to another one
问题描述
在我的应用程序中,我需要将一个非常大的集合分支移动到另一个集合。目前,我正在使用类似的东西:
In my application, I need to move a quite big collection branch to another collection. Currently, I'm using something like that:
srcRef
.startAt(start)
.endAt(end)
.once('value', function(snap) {
destRef.set(snap.exportVal());
});
显然,它非常昂贵,所以我的问题是:为什么Firebase不提供简单的API那?喜欢:
Obviously, it is quite expensive, so my question is: Why Firebase does not provide a simple API for that? like:
srcRef.moveTo(destRef);
推荐答案
您可以使用Firebase CLI。
使用npm安装Firebase CLI
The Firebase CLI is installed with npm
sudo npm install -g firebase-tools
然后你可以执行命令来获取和设置数据:
Then you can execute commands to get and set data:
firebase data:get / -f "<my-firebase-app>"
我有一个名为firebase-dot-files 的个人项目,它创建bash函数来执行常见操作。其中一个是传输数据。设置bash函数后,您可以执行以下命令:
I have a personal project called firebase-dot-files that creates bash function to do common operations. One of them is transferring data. After you setup the bash functions you can do the following command:
transfer_to dev-firebase staging-firebase
Firebase CLI作为npm模块
Firebase CLI也可以是使用节点模块。这意味着您可以调用常用的CLI方法,但作为函数。
The Firebase CLI can also be used a node module. This means you can call your usual CLI methods, but as functions.
这是一个简单的数据:get命令:
Here is a simple data:get command:
var client = require('firebase-tools');
client.data.get('/', { firebase: '<my-firebase-db>', output: 'output.json'})
.then(function(data) {
console.log(data);
process.exit(1);
})
.catch(function(error) {
console.log(error);
process.exit(2);
});
要传输数据,您可以将数据:get,与data:set组合在一起。
function transfer(path, options) {
var fromDb = options.fromDb;
var toDb = options.toDb;
var output = options.output;
client.data.get(path, { firebase: fromDb, output: output })
.then(function(data) {
return client.data.set(path, output, { firebase: toDb, confirm: true });
})
.then(function(data) {
console.log('transferred!');
process.exit(1);
})
.catch(function(error) {
console.log(error);
process.exit(2);
});
}
transfer('/', { fromDb: '<from>', toDb: 'to', output: 'data.json' });
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