[英]Updating an array item using NodeJS, MongoDB & Monk
I have a data set like this: 我有这样的数据集:
{
name : 'Doc Name',
photos: [
{
name: 'photo1',
url: 'http://.....'
},
{
name: 'photo2',
url: 'http://......'
}
],
etc ...
Using Monk https://github.com/LearnBoost/monk how do I update photo2? 使用Monk https://github.com/LearnBoost/monk如何更新photo2? I can use an index as I am iterating over the fields at the moment. 我可以使用索引,因为我正在迭代字段。
My current attempt below gives me an error, and I can't use a variable for the JSON selector (as in the index). 我下面的当前尝试给了我一个错误,我不能为JSON选择器使用变量(如在索引中)。
collection.update({_id: data._id}, {photos[i].data: filename}, function(err, updatedata) {
});
So I found a solution to my problem but there may be some better options and I will leave it unanswered. 所以我找到了解决问题的方法,但可能会有一些更好的选择,我将不予回答。 But for anyone else with the same issue this is what I did: 但对于有同样问题的其他人来说,这就是我所做的:
I extracted the MongoDB document as an object in Node.js, manipulated the document, and then replaced the entire array in a single update statement. 我将MongoDB文档作为Node.js中的对象提取,操作文档,然后在单个更新语句中替换整个数组。 For example here is some pseudo code: 例如,这里有一些伪代码:
collection.find({id: 1}, function(err, doc){
for(i=0; i< doc.array.length; i++) {
//do what you gotta do
doc.array[i].property = 'new value';
}
collection.update({id: 1}, {$set : {"doc.array": doc.array}}, function(err,doc){
console.log(err);
}
})
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