我遇到了函數返回未定義數組的問題。Promise.all返回一個未定義的數組
這裏是代碼:
classMethods.getQueries = function(models, dbId, dateStart, dateEnd) {
return new Promise(function(resolve, reject) {
/* Fetch database .... */
.then(extractQueries, reject)
.then(sortQueries, reject)
.then(onlyTen, reject)
.then(addText, reject)
.then(function(queries) {
console.log('getQueries finished', queries) ; //array of 10 undefined!
resolve(queries);
}, reject);
/* Functions here .... */
});
};
一切都很好,直到addText功能:
function addText(queries) {
return Promise.all(queries.map(function(query) {
models.queries.findById(query.queryId, { raw: true, attributes: ['query'] })
.then(function(queryFetched) {
query.text = queryFetched.query;
console.log(query);
return Promise.resolve(query);
}, function(error) {
return Promise.reject(error);
});
}));
};
這是給我的oupout像:
getQueries finished [undedfined 10x]
10x
[query database]
{queryId: ***, text: ********}
我不知道爲什麼諾言是循環未完成時返回。
感謝您的幫助。
沒有理由來包裝你的承諾那樣。 – MinusFour