How can I access a service from a Nest service?

Question

Node.js

I have a PurchaseService that needs to access a second userService .
When I try to import userService into PurchaseService, I get an error like this:

Nest can't resolve dependencies of the PurchaseService (paymentsEntityRepository, ?). Please make sure
 that the argument userService at index [1] is available in the PurchaseModule context.

Potential solutions:
- If userService is a provider, is it part of the current PurchaseModule?
- If userService is exported from a separate @Module, is that module imported within PurchaseModule?
  @Module({
    imports: [ /* the Module containing userService */ ]
  })

How to solve it?

Answer 1

In the module where the PurchaseService service is, you need to import the module where the userService service is, or add userService to the providers array of the module where the PurchaseService.