是否可以从 Meteor 读取所有数据库操作？

Question

如果我有这样设置的数据库：

@Apples = new Meteor.Collection 'apples'

有没有办法设置一个函数，每次对apple进行数据库操作时调用一个函数？例如

Apple.update {name: 'Frank'}

导致这样的事情被称为：

appleOperation = (operation, parameter) ->
    # Log the operation in another database
    # Continue with the database operation

Answer 1

我相信您可能正在寻找 cursor.observe and/or cursor.observeChanges。不好意思没用Coffeescript

Apples = new Meteor.Collection("apples");

Apples.find().observe({
    added: function(document) {
        // Do stuff with the added document
    },
    changed: function(newDoc, oldDoc) {
        // Do stuff with the old and new document
    },
    removed: function(document) {
        // Do stuff with the removed document
    }
});

如果您现在添加文档：

Apples.insert({name: "Frank"});

将使用 Frank 插入时使用的任何 ID 调用添加的函数，并将 {name: "Frank"} 作为字段参数。

与 observeChanges 类似，它只为您提供更改的字段

Apples.find().observeChanges({
    added: function(id, fields) {
        // Do stuff with the added document
    },
    changed: function(id, fields) {
        // Do stuff with the changed fields
    },
    removed: function(id) {
        // Do stuff with the id of the removed document
    }
});

见Meteor documentation

Answer 2

是的，还有一个很好的包来处理所有细节问题：

https://github.com/matb33/meteor-collection-hooks

是否可以从 Meteor 读取所有数据库操作？

Is it possible to read all database operations from Meteor?

javascript

mongodb

meteor