javascript - Bluebird 在 return 语句中不可分配给 Bluebird

Question

我试图用 .try(function(){}).catch(function(){}) 块返回一个 promise 。我的问题是由我的 promise 类型引起的。

    deleteProcess(processId: number): Promise<ProcessInstance> {
    let deletedProcess = this.Process.findById(processId);

    return Promise
        .try(function () {
            this.Process.destroy({
                where: {
                    processId: processId
                }
            })
                .then(function (rowDeleted) {
                    if (rowDeleted === 1) {
                        console.log('Deleted successfully');
                        return this.getDeletedProcess();
                    }
                })
                .catch(function (err) {
                    console.log(err);
                })
        });

    function getDeletedProcess(): ProcessInstance {
        return this.deletedProcess;
    };
};

错误说，“Bluebird void”类型不能分配给“Bluebird ProcessInstance”类型

Answer 1

这篇文章对解决问题真的很有帮助

Bluebird.JS Promise: new Promise(function (resolve, reject){}) vs Promise.try(function(){})

这解决了这个问题:

    return new Promise<ProcessInstance>(
        (function (resolve, reject) {
            this.Process.destroy({
                where: {
                    processId: processId
                }
            })
                .then(function (rowDeleted) {
                    if (rowDeleted === 1) {
                        console.log('Deleted successfully');
                        return this.getDeletedProcess();
                    }
                })
                reject(function (err) {
                    console.log(err);
                })
        })
        )