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Django Service Objects
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from django import forms | |
from django.core.exceptions import ValidationError | |
from django.db import transaction | |
class InvalidInputsError(Exception): | |
def __init__(self, errors, non_field_errors): | |
self.errors = errors | |
self.non_field_errors = non_field_errors | |
def __str__(self): | |
return f'{repr(self.errors)} {repr(self.non_field_errors)}' | |
class Service(forms.Form): | |
def service_clean(self): | |
if not self.is_valid(): | |
raise InvalidInputsError(self.errors, self.non_field_errors()) | |
@classmethod | |
def execute(cls, inputs, files=None, **kwargs): | |
instance = cls(inputs, files, **kwargs) | |
instance.service_clean() | |
with transaction.atomic(): | |
return instance.process() | |
def process(self): | |
raise NotImplementedError() | |
class MultipleFormField(forms.Field): | |
""" | |
A field that contains many forms, similar to a FormSet but easier to clean | |
""" | |
def __init__(self, form_class, min_count=1, max_count=None, *args, | |
**kwargs): | |
super().__init__(*args, **kwargs) | |
self.form_class = form_class | |
self.min_count = min_count | |
self.max_count = max_count | |
def clean(self, values): | |
if len(values) < self.min_count: | |
raise ValidationError( | |
f'There needs to be at least {self.min_count} item/s.') | |
if self.max_count and len(values) > self.max_count: | |
raise ValidationError( | |
f'There needs to be at most {self.max_count} item/s.') | |
item_forms = [] | |
for index, item in enumerate(values): | |
item_form = self.form_class(item) | |
if not item_form.is_valid(): | |
raise ValidationError(f'[{index}]: {repr(item_form.errors)}') | |
item_forms.append(item_form) | |
return item_forms |
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You can find the library version here.
https://github.com/mixxorz/django-service-objects