Support for fields in Python

[Desdaemon]

Completions/references/definitions for fields in Python (already done in XML)

class Foo(models.Model):
    def fun(self):
        self.env['foo.bar'].|

Two approaches:

• Self-contained: perform rudimentary analysis by walking the AST to determine if expression is a model type, then generate completions based on that information.
  • Doable, does not depend on Python
  • Con: duplicates the work of Pyright
• Pyright: find a way to supplement type info for Pyright from outside
  • If successful, other features can benefit as well
  • Con: Pyright does not expose an easily consumable API

[Desdaemon]

Third approach: Mypy

• Has a plugin framework suitable for this purpose
• Con: Communication between the LSP and mypy is non-trivial and adds overhead
• Con: Desync between pyright and mypy is very easy