[英]Dynamic Variable name construction in JS using Lodash or ES6
Instead of referring fields[0] fields[1]
, Someone help me to construct dynamically.而不是引用
fields[0] fields[1]
,有人帮我动态构造。
//fields =['string1','string2']
createNestedSubDoc(id, body, fields) {
return this.model.findById(id).then(doc => {
doc[fields[0]][fields[1]].push(body)
return doc.save()
})
}
Here is what you are doing right now:这是你现在正在做的事情:
// Your code pushes body to the array doc.key1.key2
// Is that the behaviour you want?
const doc = {
key1: {
key2: []
}
}
const fields = ['key1', 'key2']
createNestedSubDoc(id, body, fields) {
return this.model.findById(id).then(doc => {
doc[fields[0]][fields[1]].push(body)
return doc.save()
})
}
If the number of fields is unknown, you can use lodash.pick
:如果字段数未知,您可以使用
lodash.pick
:
const _ = require('lodash')
createNestedSubDoc(id, body, fields) {
return this.model.findById(id).then(doc => {
const arrayPropertyInDoc = _.pick(doc, fields)
arrayPropertyInDoc.push(body)
return doc.save()
})
}
If what you are actually tryna do is merge a document fragment contained in body
to a particular point in the doc
, then push is not the right method.如果您实际上尝试将包含在
body
的文档片段合并到doc
的特定点,那么 push 不是正确的方法。
It isn't elegant, but I am pretty sure that this is what you're wanting to get done.它并不优雅,但我很确定这就是您想要完成的工作。
// Your current code: //fields =['string1','string2'] //createNestedSubDoc(id, body, fields) { // return this.model.findById(id).then(doc => { // doc[fields[0]][fields[1]].push(body) // return doc.save() // }) //} // Lodash solution. const fields = ['string1', 'string2']; function createNestedSubDoc(id, body, fields) { return this.model.findById(id) .then((doc) => { const path = _.join(fields, '.'); const currentPathArray = _.get(doc, path, []); _.set(doc, path, _.concat(currentPathArray, [body]); return doc.save(); }); }
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