Sequelize issue with Webpack.

[verinderSingh]

Bug Description

Sequelize(6.32.1) associations issue when the application is built with Webpack

Reproducible Example

In my serverless.yml file, I have a plugin as below which helps in bundling my nodejs project with webpack:

plugins:
  - serverless-webpack

In .js file, I have defined the association as below:

Appointment.hasMany(WorkOrder, {
      foreignKey: 'appointment_id'
    });
    WorkOrder.belongsTo(Appointment, {
      foreignKey: 'appointment_id'
    });

Below code snippet is failing with error : 'TypeError: r.addWorkOrder is not a function '

await sequelize.transaction(async (t) => {
      const savedAppt = await Appointment.create(body, {
        transaction: t
      });
      const savedWO= await WorkOrder.bulkCreate(woData, {
        transaction: t
      });
      await savedAppt.addWorkOrder(savedWO, { transaction: t }); // this line is failing
    });

I tried to print savedAppt.countWorkOrders() to verify if other under-the-hood functions are working or not. But found the same error.
console.log("workorders:: ", savedAppt.countWorkOrders());

If I run the code locally without webpack bundling, then the code runs fine.

What do you expect to happen?

Association functions(addWorkOrders,countMasterCredTypes etc ) should work without any errors.

What is actually happening?

The code is failing with the below error after bundling the app with webpack.

TypeError: r.addWorkOrder is not a function

Environment

DEV, QA, STAGE

• Sequelize version: sequelize@6.32.1 . No data found for 'npm list @sequelize/core'
• Node.js version: v18.15.0
• If TypeScript related: TypeScript version: npm list typescript gave response as below :

- └─┬ serverless-webpack@5.11.0
  ├─┬ ts-node@10.9.1
  │ └── typescript@5.0.3 deduped
  └── typescript@5.0.3

• Database & Version: PostgreSQL 14.5
• Connector library & Version: "pg": 8.11.1

Would you be willing to resolve this issue by submitting a Pull Request?

No, I don't have the time, and I understand that I will need to wait until someone from the community or maintainers is interested in resolving my issue.

Indicate your interest in the resolution of this issue by adding the 👍 reaction. Comments such as "+1" will be removed.

[WikiRik]

There's been more issues in the past with using webpack, but the current maintainers do not have a lot of experience with this. I'll remove the pending-approval label but as it works well without webpack bundling you'll have to wait until somebody of the community can help you out

[ephys]

I do have lots of experience with webpack, but we need a reproducible example to be able to help you

[verinderSingh]

I do have lots of experience with webpack, but we need a reproducible example to be able to help you

I will create a small sample project and will share it here...basically, the issue only occurs if we have table associations. No function is accessible that sequelize provides by default for associations. I have provided the error and code snippet in the description. Let me create an example to share with you

[ephys]

@verinderSingh have you figured out how to solve this issue?