In the early stages of developing an application using Next.js, Mongoose, and Typescript, I encountered a persistent issue. Whenever I attempt to send a request through Postman after clicking save, it fails, displaying the error message:
OverwriteModelError: Cannot overwrite Expertise Post model once compiled.
Despite diligently researching solutions and implementing suggested changes, such as adding export default mongoose.models.ExpertisePost || mongoose.model<ExpertisePostInterface>("Expertise Post", expertisePostSchema);, the problem persists.
The Problem: Every CRUD action in Postman triggers the aforementioned error. Even after recompiling with "npm run dev", I can only perform a single GET request before encountering the same issue.
Upon further investigation, I noticed that mongoose.models.ExpertisePost returns undefined whenever the error occurs. This indicates a failure to read the defined model, leading to an attempt to overwrite it using the code: mongoose.model("Expertise Post", expertisePostSchema). Such an operation is prohibited post-compilation. The ideal scenario would involve mongoose.models.ExpertisePost returning a pre-compiled model instead of being undefined.
Highlighted below are the files central to this challenge:
1. expertisePost.ts - Houses the Mongoose model for an expertisePost.
[Code snippet from expertisePost.ts]2. expertisePostControllers.ts - Utilizes the above model in multiple functions for various CRUD operations.
[Code snippet from expertisePostControllers.ts]Despite setting up the environment correctly and running the application successfully via "npm run dev", performing actions in Postman results in the recurring OverwriteModelError. These issues impede the smooth execution of CRUD operations expected during API testing with Postman.