express+mongoose寫接口的時候，第二次請求報錯

原創 吴文炜 2020-07-08 06:31

出現如下報錯：

(node:3488) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): OverwriteModelEr
ror: Cannot overwrite col_1 model once compiled.

解決辦法是將 mongoose.model 模型定義在請求接口外面，不能重複定義！

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