# coding: utf-8
from django.db import models
from django.http import JsonResponse
from django.utils import timezone
from django.core.cache import cache
from django.utils.translation import ugettext_lazy as _
from django.contrib import messages
from rest_framework.utils import html
from rest_framework.settings import api_settings
from rest_framework.exceptions import ValidationError
from rest_framework.fields import SkipField
from .const import KEY_CACHE_RESOURCES_ID
class NoDeleteQuerySet(models.query.QuerySet):
def delete(self):
return self.update(is_discard=True, discard_time=timezone.now())
class NoDeleteManager(models.Manager):
def get_all(self):
return NoDeleteQuerySet(self.model, using=self._db)
def get_queryset(self):
return NoDeleteQuerySet(self.model, using=self._db).filter(is_discard=False)
def get_deleted(self):
return NoDeleteQuerySet(self.model, using=self._db).filter(is_discard=True)
class NoDeleteModelMixin(models.Model):
is_discard = models.BooleanField(verbose_name=_("is discard"), default=False)
discard_time = models.DateTimeField(verbose_name=_("discard time"), null=True, blank=True)
objects = NoDeleteManager()
class Meta:
abstract = True
def delete(self):
self.is_discard = True
self.discard_time = timezone.now()
return self.save()
class JSONResponseMixin(object):
"""JSON mixin"""
@staticmethod
def render_json_response(context):
return JsonResponse(context)
class IDInFilterMixin(object):
def filter_queryset(self, queryset):
queryset = super(IDInFilterMixin, self).filter_queryset(queryset)
id_list = self.request.query_params.get('id__in')
if id_list:
import json
try:
ids = json.loads(id_list)
except Exception as e:
return queryset
if isinstance(ids, list):
queryset = queryset.filter(id__in=ids)
return queryset
class IDInCacheFilterMixin(object):
def filter_queryset(self, queryset):
queryset = super(IDInCacheFilterMixin, self).filter_queryset(queryset)
spm = self.request.query_params.get('spm')
cache_key = KEY_CACHE_RESOURCES_ID.format(spm)
resources_id = cache.get(cache_key)
if resources_id and isinstance(resources_id, list):
queryset = queryset.filter(id__in=resources_id)
return queryset
class IDExportFilterMixin(object):
def filter_queryset(self, queryset):
# 下载导入模版
if self.request.query_params.get('template') == 'import':
return []
else:
return super(IDExportFilterMixin, self).filter_queryset(queryset)
class BulkSerializerMixin(object):
"""
Become rest_framework_bulk not support uuid as a primary key
so rewrite it. https://github.com/miki725/django-rest-framework-bulk/issues/66
"""
def to_internal_value(self, data):
from rest_framework_bulk import BulkListSerializer
ret = super(BulkSerializerMixin, self).to_internal_value(data)
id_attr = getattr(self.Meta, 'update_lookup_field', 'id')
if self.context.get('view'):
request_method = getattr(getattr(self.context.get('view'), 'request'), 'method', '')
# add update_lookup_field field back to validated data
# since super by default strips out read-only fields
# hence id will no longer be present in validated_data
if all((isinstance(self.root, BulkListSerializer),
id_attr,
request_method in ('PUT', 'PATCH'))):
id_field = self.fields[id_attr]
if data.get("id"):
id_value = id_field.to_internal_value(data.get("id"))
else:
id_value = id_field.to_internal_value(data.get("pk"))
ret[id_attr] = id_value
return ret
class BulkListSerializerMixin(object):
"""
Become rest_framework_bulk doing bulk update raise Exception:
'QuerySet' object has no attribute 'pk' when doing bulk update
so rewrite it .
https://github.com/miki725/django-rest-framework-bulk/issues/68
"""
def to_internal_value(self, data):
"""
List of dicts of native values <- List of dicts of primitive datatypes.
"""
if html.is_html_input(data):
data = html.parse_html_list(data)
if not isinstance(data, list):
message = self.error_messages['not_a_list'].format(
input_type=type(data).__name__
)
raise ValidationError({
api_settings.NON_FIELD_ERRORS_KEY: [message]
}, code='not_a_list')
if not self.allow_empty and len(data) == 0:
if self.parent and self.partial:
raise SkipField()
message = self.error_messages['empty']
raise ValidationError({
api_settings.NON_FIELD_ERRORS_KEY: [message]
}, code='empty')
ret = []
errors = []
for item in data:
try:
# prepare child serializer to only handle one instance
if 'id' in item.keys():
self.child.instance = self.instance.get(id=item['id']) if self.instance else None
if 'pk' in item.keys():
self.child.instance = self.instance.get(id=item['pk']) if self.instance else None
self.child.initial_data = item
# raw
validated = self.child.run_validation(item)
except ValidationError as exc:
errors.append(exc.detail)
else:
ret.append(validated)
errors.append({})
if any(errors):
raise ValidationError(errors)
return ret
class DatetimeSearchMixin:
date_format = '%Y-%m-%d'
date_from = date_to = None
def get_date_range(self):
date_from_s = self.request.GET.get('date_from')
date_to_s = self.request.GET.get('date_to')
if date_from_s:
date_from = timezone.datetime.strptime(date_from_s, self.date_format)
tz = timezone.get_current_timezone()
self.date_from = tz.localize(date_from)
else:
self.date_from = timezone.now() - timezone.timedelta(7)
if date_to_s:
date_to = timezone.datetime.strptime(
date_to_s + ' 23:59:59', self.date_format + ' %H:%M:%S'
)
self.date_to = date_to.replace(
tzinfo=timezone.get_current_timezone()
)
else:
self.date_to = timezone.now()
def get(self, request, *args, **kwargs):
self.get_date_range()
return super().get(request, *args, **kwargs)
class ApiMessageMixin:
success_message = _("%(name)s was %(action)s successfully")
_action_map = {"create": _("create"), "update": _("update")}
def get_success_message(self, cleaned_data):
if not isinstance(cleaned_data, dict):
return ''
data = {k: v for k, v in cleaned_data.items()}
action = getattr(self, "action", "create")
data["action"] = self._action_map.get(action)
try:
message = self.success_message % data
except:
message = ''
return message
def dispatch(self, request, *args, **kwargs):
resp = super().dispatch(request, *args, **kwargs)
if request.method.lower() in ("get", "delete", "patch"):
return resp
if resp.status_code >= 400:
return resp
message = self.get_success_message(resp.data)
if message:
messages.success(request, message)
return resp