[英]How to access the response from .find in a JSON object with Node.js
我有一个“伪”数据库,类似于 MongoDB 中的一个集合,它有一个 JSON object。
export const roles = [
{
_id: "870c4350-3cf5-4f35-8429-513bd86c6734",
programId: "e3e20d57-571d-45ab-b13a-b07d29fcf968",
profileId: "3cbaadcf-41e1-423b-aa6a-b3fb401df148",
fullName: null,
jobTitle: "Regional Implementation Executive",
department: "Electronics",
favouriteColour: "salmon",
},
{
_id: "ed231d80-f22b-4f52-bd94-9d58a2fbdbc8",
programId: "e3e20d57-571d-45ab-b13a-b07d29fcf968",
profileId: "1bc21aff-896f-44da-8436-a1604a626c39",
fullName: null,
jobTitle: "Direct Identity Strategist",
department: "Beauty",
favouriteColour: "silver",
},
{
_id: "c6804099-150f-401b-9e3d-15945085fdde",
programId: "e3e20d57-571d-45ab-b13a-b07d29fcf968",
profileId: "580acb22-46f1-4bc3-b74f-606c933e43a0",
fullName: null,
jobTitle: "Investor Brand Developer",
department: "Garden",
favouriteColour: "cyan",
},
{
_id: "45119579-ec48-4d7b-b4e3-656d2ad5468b",
programId: "e3e20d57-571d-45ab-b13a-b07d29fcf968",
profileId: "98793f3f-2f03-49a8-b77e-e96e0eff1b28",
fullName: null,
jobTitle: "National Research Facilitator",
department: "Home",
favouriteColour: "turquoise",
}
];
使用.find
我试图获取所有带有fullName: null
和programId: 'e3e20d57-571d-45ab-b13a-b07d29fcf968
。
这是我尝试使用 .then .then()
访问响应的代码,因为.find
是一种异步方法。
await roles.find({
fullName: null,
programId: 'e3e20d57-571d-45ab-b13a-b07d29fcf968'
}).then((res.update(
{
programId: x._id,
},
{
fullName: x.name,
})
))
.catch(err => console.log(err));
但是,我无法访问响应,因为我收到错误说res is not defined 。
错误。
(node:99872) UnhandledPromiseRejectionWarning: ReferenceError: res is not defined
at callback (/Users/Rahul/PersonalProjects/js-test/redact-surnames.js:28:20)
at Object.forEach (/Users/Rahul/PersonalProjects/js-test/lib/collections.js:16:13)
at _default (/Users/Rahul/PersonalProjects/js-test/redact-surnames.js:6:3)
(node:99872) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2)
(node:99872) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
我知道这个带有.find
的查询就像我将响应分配给const
然后console.log({ });
我看到它打印得很好。
const response = await roles.find({
fullName: null,
programId: 'e3e20d57-571d-45ab-b13a-b07d29fcf968'
});
console.log({ response });
但是,我无法使用.then
和res
访问它,也许我在语法上犯了错误,但我们将不胜感激。
如果您试图获取符合条件的角色内的所有项目
fullName === null && programId === 'e3e20d57-571d-45ab-b13a-b07d29fcf968'
您可以简单地使用过滤器来遍历数组并获得过滤后的结果。
这是一篇好文章:
https://medium.com/poka-techblog/simplify-your-javascript-use-map-reduce-and-filter-bd02c593cc2d
但是如果你使用.find()
,它将返回与传递的条件相对应的第一个值。 如果这就是你所追求的,你可以使用.find()
。
const roles = [ { _id: "870c4350-3cf5-4f35-8429-513bd86c6734", programId: "e3e20d57-571d-45ab-b13a-b07d29fcf968", profileId: "3cbaadcf-41e1-423b-aa6a-b3fb401df148", fullName: null, jobTitle: "Regional Implementation Executive", department: "Electronics", favouriteColour: "salmon", }, { _id: "ed231d80-f22b-4f52-bd94-9d58a2fbdbc8", programId: "e3e20d57-571d-45ab-b13a-b07d29fcf968", profileId: "1bc21aff-896f-44da-8436-a1604a626c39", fullName: null, jobTitle: "Direct Identity Strategist", department: "Beauty", favouriteColour: "silver", }, { _id: "c6804099-150f-401b-9e3d-15945085fdde", programId: "e3e20d57-571d-45ab-b13a-b07d29fcf968", profileId: "580acb22-46f1-4bc3-b74f-606c933e43a0", fullName: null, jobTitle: "Investor Brand Developer", department: "Garden", favouriteColour: "cyan", }, { _id: "45119579-ec48-4d7b-b4e3-656d2ad5468b", programId: "e3e20d57-571d-45ab-b13a-b07d29fcf968", profileId: "98793f3f-2f03-49a8-b77e-e96e0eff1b28", fullName: null, jobTitle: "National Research Facilitator", department: "Home", favouriteColour: "turquoise", } ]; // Using filter method const filterResult = roles.filter((role)=> role.fullName === null && role.programId ==='e3e20d57-571d-45ab-b13a-b07d29fcf968'); // note: result here is an array of object/s console.log(filterResult); // Using find method const findResult = roles.find((role)=> role.fullName === null && role.programId ==='e3e20d57-571d-45ab-b13a-b07d29fcf968'); // note: result here is an object console.log(findResult);
我认为它导致了错误,
await roles.find({
fullName: null,
programId: 'e3e20d57-571d-45ab-b13a-b07d29fcf968'
}).then((res.update({ // <
programId: x._id, // <
}, { // <
fullName: x.name, // <
}))) // <
.catch(err => console.log(err));
我想,你试图做这样的事情,
.then(res =>
res.update({
programId: x._id
}, {
fullName: x.name
})
)
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