Modifying interpolated dictionary does not stick

[jzazo]

Describe the bug The following code does not allow modification of a nested interpolated variable:

from dataclasses import dataclass
from omegaconf import OmegaConf

OmegaConf.register_new_resolver("expand", lambda: OmegaConf.create(Expanded()))

@dataclass
class Expanded:
    foo: int = 1
    boo: str = "bar"

@dataclass
class Config:
    bee: Expanded = "${expand:}"

cfg = OmegaConf.structured(Config)
print(cfg.bee.foo)  # prints 1
OmegaConf.resolve(cfg)
cfg.bee.foo = 2  # changes value to 2?
print(cfg.bee.foo)  # should print 2 but prints 1

Expected behavior I would expect that modifying a nested variable even if it comes from an interpolated variable persists.

Additional context

• [x] OmegaConf version: 2.3.0
• [x] Python version: 3.10.6
• [x] Operating system: Ubuntu 22.04
• [x] Please provide a minimal repro

[omry]

Resolvers are running every time you are accessing them. There is mechanism to cache the result, which might give you the behavior you are after.

Try something like:

OmegaConf.register_new_resolver("expand", lambda: OmegaConf.create(Expanded()), use_cache=True)

In any case, what you are describing is not a bug.

[jzazo]

Thanks for the suggested solution, but shouldn't OmegaConf.resolve resolve in-place and then its result be modifyable?

[omry]

It should and looks like it does. This runs smoothly. Double check your example.

from dataclasses import dataclass
from omegaconf import OmegaConf

OmegaConf.register_new_resolver("expand", lambda: OmegaConf.create(Expanded()))

@dataclass
class Expanded:
    foo: int = 1
    boo: str = "bar"

@dataclass
class Config:
    bee: Expanded = "${expand:}"

cfg = OmegaConf.structured(Config)
assert cfg.bee.foo == 1
OmegaConf.resolve(cfg)
cfg.bee.foo = 2
assert cfg.bee.foo == 2

[jzazo]

Ok, thank you, it works. I think I may have added the resolve call later and probably didn't save the file or something like that when I ran it.