Getting "500 Internal Server Error" while posting a request to the MongoDB using Mongoose-CodePudding

I am developing an online survey application based on React, NodeJS, Express, MongoDB and Mongoose. I face this issue when I wanted to post a request (via a form submission) to the MongoDB via Mongoose and I always get error message "Creating answer failed, please try again." with my code to recognize it is related to error happened with DB. I can see the request body is created actually in payload of request; however, the document is not created in the MongoDB. Please refer to the related code as below.

https://codesandbox.io/s/sharp-glitter-885pg?file=/src/backend/model/text-question.js

CodePudding user response：

Try to push the _id of the createdAnswer instead of the whole object after its creation in the text-controller.js file:

...
    const sess = await mongoose.startSession();
    sess.startTransaction();
    await createdAnswer.save({ session: sess });
    // Add createdAnswer id to the specific user
    user.answers.push(createdAnswer._id); // <- CHANGE THIS LINE
    await user.save({ session: sess });
    await sess.commitTransaction();
...