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allow using module-function-combinations as dynamic field defaults

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Daniil Fajnberg 2021-12-29 18:26:16 +01:00
parent 987e83c110
commit 6d80cf957f
1 changed files with 16 additions and 3 deletions
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19
src/yamlhttpforms/form.py
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@ -1,4 +1,5 @@
from pathlib import Path from pathlib import Path
from importlib import import_module
from typing import Dict, Callable, Union, Optional, Any, TYPE_CHECKING from typing import Dict, Callable, Union, Optional, Any, TYPE_CHECKING
from yaml import safe_load from yaml import safe_load
@ -9,14 +10,26 @@ if TYPE_CHECKING:
PathT = Union[Path, str] PathT = Union[Path, str]
CallableDefaultT = Callable[[], Optional[str]] CallableDefaultT = Callable[[], Optional[str]]
DefaultValueT = Union[str, CallableDefaultT] DefaultInitT = Union[str, Dict[str, str]]
OptionsT = Dict[str, str] OptionsT = Dict[str, str]
class FormField: class FormField:
def __init__(self, name: str, default: DefaultValueT = None, options: OptionsT = None, required: bool = False): def __init__(self, name: str, default: DefaultInitT = None, options: OptionsT = None, required: bool = False):
self.name: str = name self.name: str = name
self._default: Optional[DefaultValueT] = default self._default: Union[str, CallableDefaultT, None]
if isinstance(default, dict):
try:
module, function = default['module'], default['function']
except KeyError:
raise TypeError(f"Default for field '{name}' is invalid. The default must be either a string or a "
f"dictionary with the special keys 'module' and 'function'.")
obj = import_module(module)
for attr in function.split('.'):
obj = getattr(obj, attr)
self._default = obj
else:
self._default = default
self.options: Optional[OptionsT] = options self.options: Optional[OptionsT] = options
self.required: bool = required self.required: bool = required