78 lines
2.5 KiB
Python
78 lines
2.5 KiB
Python
"""Generic models"""
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import re
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from django.core.exceptions import ValidationError
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from django.core.validators import URLValidator
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from django.db import models
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from django.utils.regex_helper import _lazy_re_compile
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from model_utils.managers import InheritanceManager
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from rest_framework.serializers import BaseSerializer
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class SerializerModel(models.Model):
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"""Base Abstract Model which has a serializer"""
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@property
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def serializer(self) -> BaseSerializer:
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"""Get serializer for this model"""
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raise NotImplementedError
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class Meta:
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abstract = True
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class CreatedUpdatedModel(models.Model):
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"""Base Abstract Model to save created and update"""
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created = models.DateTimeField(auto_now_add=True)
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last_updated = models.DateTimeField(auto_now=True)
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class Meta:
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abstract = True
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class InheritanceAutoManager(InheritanceManager):
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"""Object manager which automatically selects the subclass"""
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def get_queryset(self):
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return super().get_queryset().select_subclasses()
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class InheritanceForwardManyToOneDescriptor(models.fields.related.ForwardManyToOneDescriptor):
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"""Forward ManyToOne Descriptor that selects subclass. Requires InheritanceAutoManager."""
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def get_queryset(self, **hints):
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return self.field.remote_field.model.objects.db_manager(hints=hints).select_subclasses()
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class InheritanceForeignKey(models.ForeignKey):
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"""Custom ForeignKey that uses InheritanceForwardManyToOneDescriptor"""
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forward_related_accessor_class = InheritanceForwardManyToOneDescriptor
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class DomainlessURLValidator(URLValidator):
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"""Subclass of URLValidator which doesn't check the domain
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(to allow hostnames without domain)"""
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def __init__(self, *args, **kwargs) -> None:
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super().__init__(*args, **kwargs)
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self.host_re = "(" + self.hostname_re + self.domain_re + "|localhost)"
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self.regex = _lazy_re_compile(
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r"^(?:[a-z0-9.+-]*)://" # scheme is validated separately
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r"(?:[^\s:@/]+(?::[^\s:@/]*)?@)?" # user:pass authentication
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r"(?:" + self.ipv4_re + "|" + self.ipv6_re + "|" + self.host_re + ")"
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r"(?::\d{2,5})?" # port
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r"(?:[/?#][^\s]*)?" # resource path
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r"\Z",
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re.IGNORECASE,
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)
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self.schemes = ["http", "https", "blank"]
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def __call__(self, value):
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# Check if the scheme is valid.
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scheme = value.split("://")[0].lower()
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if scheme not in self.schemes:
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value = "default" + value
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return super().__call__(value)
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