Loopback 4.x - "Error: The connector has not been initialized."

Question

我目前正在采用一个基于 Loopback 构建的项目。我正在尝试切换到开发数据库，并且主要通过查找和替换策略来解决问题。

将对生产数据库的所有引用更改为指向开发数据库后，出现错误：

Cannot start the application. Error: The connector has not been initialized.
    at PostgresDataSource.freeze (project/api/node_modules/loopback-datasource-juggler/lib/datasource.js:1982:11)
    at PostgresDataSource.DataSource.autoupdate (project/api/node_modules/loopback-datasource-juggler/lib/datasource.js:1068:8)
    at InstrideIdentityApiApplication.migrateSchema (project/api/node_modules/@loopback/repository/dist/mixins/repository.mixin.js:186:40)
    at <anonymous>

我不知道这是什么意思。我尝试在 git 中搜索到 find the error code, but got no results. I've looked into the docs on connectors 的环回，但它没有说明连接器在哪个阶段变为 "initialized."

我的问题是：

这个错误到底想告诉我什么？
人们通常会做什么来修复它？

Answer 1

What exactly is this error trying to tell me?

错误告诉您您的数据源没有配置任何连接器。如果您查看堆栈跟踪，则会在调用 migrateSchema 时触发错误。没有连接器，数据源不知道如何连接到数据库，因此无法执行模式迁移。

What does one typically do to fix it?

确保您的数据源配置包含 connector 属性.

Loopback 4.x - "Error: The connector has not been initialized."

Loopback 4.x - "Error: The connector has not been initialized."

compiler-errors

loopbackjs