Implementation of simple InstanceScope

[davebirch]

Am aware this is more a question, rather than a bug, but perhaps an indication that an example scope implementation (other that an example of seemingly re-implementing NoScope would be helpful for those new to injector.

Anyway, I am trying to implement a simple custom scope which provides the same instance of a given class to any sub-objects in that class that might require a reference to it.

e,g

class A:
  @inject
  def __init__(self, b: B, c: C):
    self.b = b
    self.c = c

class B:
  @inject
  def __init__(self, c: C):
    self.c =c

class C:
  pass

I essentially need a scope that will ensure that the instance of C that is provided at injection of both A and B is the same one for any given instance of A.

It feels like I should be able to do this by creating a custom scope that is applied on A, but the scope documentation is great for everything except for an idea of how you might go about implementing the scoping itself, I feel like I'm missing something obvious somewhere!

Currently I am handling this by using AssistedBuilder instances in a factory class to provide those C instance, but that feels like the wrong approach...

[jstasiak]

Yeah, the documentation can be improved in this regard. About your case – can you provide some pseudo-code of what you're trying to achieve?

[davebirch]

Sorry, hit enter too early - edited the OP to include an example.

[jstasiak]

I don't think there's a way to do this at the moment. Possibly the scope system could be improved to handle this, but it'd require some redesign I believe.