Writing settings.toml every time an entry got updated or added

[dimasahmad]

I need to add some persistence when my app updated the configurations. What's the best way to do it with dynaconf? Do I really have to implement my own function, not able to extend the __setattr__ to automatically write config to the toml file?

My current code:

# config.py
from dynaconf import Dynaconf, loaders
from dynaconf.utils.boxing import DynaBox


class Config(Dynaconf):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

    def __setattr__(self, name, value):
        super().__setattr__(name, value)
        loaders.write('config.toml', DynaBox(self.as_dict()).to_dict())


config = Config(
    envvar_prefix="",
    settings_files=['config.toml'],
)

It throws an AttributeError exception:

Traceback (most recent call last):
 File "__main__.py", line 2, in <module>
   import bot
 File "/home/runner/app/bot/__init__.py", line 6, in <module>
   from config import config
 File "/home/runner/app/config.py", line 14, in <module>
   config = Config(
 File "/home/runner/app/config.py", line 7, in __init__
   super().__init__(*args, **kwargs)
 File "/opt/virtualenvs/python3/lib/python3.8/site-packages/dynaconf/base.py", line 101, in __init__
   self._warn_dynaconf_global_settings = kwargs.pop(
 File "/home/runner/app/config.py", line 11, in __setattr__
   loaders.write('config.toml', DynaBox(self.as_dict()).to_dict())
 File "/opt/virtualenvs/python3/lib/python3.8/site-packages/dynaconf/base.py", line 146, in __getattr__
   if name in self._wrapped._deleted:  # noqa
AttributeError: 'NoneType' object has no attribute '_deleted'

[ZhymabekRoman]

Hello, thank you for your code, I accidentally stumbled upon this library today and noticed that it is not possible to write the configuration directly to a file. It took me several hours of experimentation to get your code up and running. I think would not be bad to make a PR to the library itself

# new_config.py file
from dynaconf import Dynaconf  # , loaders
from dynaconf.utils.functional import empty

from dynaconf.loaders import ini_loader
from dynaconf.loaders import json_loader
from dynaconf.loaders import py_loader
from dynaconf.loaders import toml_loader
from dynaconf.loaders import yaml_loader

from dynaconf.utils.boxing import DynaBox


class Config(Dynaconf):
    def __setattr__(self, name, value):
        # Bypass infinite __setattr__ loops.
        if name not in ["_wrapped", "_kwargs", "_warn_dynaconf_global_settings"]:
            if self._wrapped is empty:
                self._setup()

        super().__setattr__(name, value)

        if name not in ["_wrapped", "_kwargs", "_warn_dynaconf_global_settings"]:
            settings_file = (self._kwargs["SETTINGS_FILE_FOR_DYNACONF"][0])

            # In the official loader, the merging configuration parameters function of the file record is set to False, which leads to the fact that other configuration parameters are not saved, that is, the entire file is overwritten without saving the previous parameters
            # loaders.write(settings_file, {name: value})

            # Using own version
            _loader_write(settings_file, {name: value})

def _loader_write(filename, data, env=None):
    """Writes `data` to `filename` infers format by file extension."""
    loader_name = f"{filename.rpartition('.')[-1]}_loader"
    loader = globals().get(loader_name)
    if not loader:
        raise IOError(f"{loader_name} cannot be found.")

    data = DynaBox(data, box_settings={}).to_dict()
    if loader is not py_loader and env and env not in data:
        data = {env: data}

    loader.write(filename, data, merge=True)  # --< Here is merge parameter


settings = Config(
    envvar_prefix="",
    settings_files=['bot/settings.toml', 'bot/.secrets.toml']
)

# test.py file
from new_config import settings

settings.bbc = "werwerwerweorcwim"

print(settings.bbc)

[rochacbruno]

A PR is very welcome!