Description

Quite often, I find myself in a situation where I need to update an existing Service in my Symfony application and I need to find "all the services relying on it" to update them.

So I have service app.category.data_provider and I want to see all other services that are being injected this instance.

So I would like this to happen:

$ php bin/console debug:container app.category.data_provider --show-usage

Information for Service "app.category.data_provider"
======================================================================

 ---------------- -----------------------------------------------------------------------
  Option           Value
 ---------------- -----------------------------------------------------------------------
  Service ID    app.category.data_provider
  Class            App\Category\Data_provider
  Tags             -
  Public           yes
  Synthetic     no
  Lazy             no
  Shared         yes
  Abstract       no
  Autowired        no
  Autoconfigured   no
  Used by:              app.category.data_handler, app.product.registrar
 ---------------- -----------------------------------------------------------------------

I think about making it optional because I expect the operation to be resources consuming, so no need to clutter the default debug:container Command with it.

I have an idea about how to do it, but it's an expensive one: go through the full container graph and look for all declarations 😅 . I'm checking whether or not the idea is good by opening this issue before diving into the code and submitting a PR.

If the application is leveraging the power of auto-wiring and strict typing, the "find usage" search can be done by any good IDE. However on legacy applications, auto-wiring and strict typing are not that common ...