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Created Dec 9, 2019
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from django.contrib.admin import ModelAdmin, register
from django.db.models import IntegerField
from django.db.models.functions import Cast
from django.db.models.expressions import Func, Value
from .models import Foo
class RegexpMatches(Func):
function = 'REGEXP_MATCHES'
def __init__(self, source, regexp, flags=None, group=None, output_field=None, **extra):
template = '%(function)s(%(expressions)s)'
if group:
if not hasattr(regexp, 'resolve_expression'):
regexp = Value(regexp)
template = '({})[{}]'.format(template, str(group))
expressions = (source, regexp)
if flags:
if not hasattr(flags, 'resolve_expression'):
flags = Value(flags)
expressions += (flags,)
self.template = template
super().__init__(*expressions, output_field=output_field, **extra)
class Foo(ModelAdmin):
list_display = ['id', 'required_field', 'required_field_string']
def get_queryset(self, request):
qs = super().get_queryset(request)
return qs.annotate(
required_field=Cast(RegexpMatches('id', r'^(.*\D)([0-9]*)$', group=2), output_field=IntegerField()),
required_field_string=RegexpMatches('id', r'^(.*\D)([0-9]*)$', group=2)
def required_field(self, obj):
return obj.required_field
def required_field_string(self, obj):
return obj.required_field_string
from django.db import models
class Foo(models.Model):
id = models.CharField(primary_key=True, max_length=100)
def __str__(self):
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