Develop Reference

drf: serializers.ModelField > How can i get user_id appropriately?

I want to implement the 'user_id' to be automatically saved at the backend without receiving it from the client. (when create object!)
This is my code.
models.py
class User(AbstractUser):
username = None
email = models.EmailField(max_length=255, unique=True)
USERNAME_FIELD = 'email'
REQUIRED_FIELDS = []
objects = UserManager()
social_profile = models.URLField(null=True,blank=True)
realname = models.CharField(max_length=50, blank=True)
nickname = models.CharField(max_length=50, null=True, unique=True)
address = models.CharField(max_length=200, blank=True)
phone = models.CharField(max_length=100, blank=True)
def __str__(self):
return self.email
class Item(models.Model):
user_id = models.ForeignKey(User, related_name='item_sets', on_delete=models.CASCADE)
category_id = models.ForeignKey(Category, related_name='item_sets', on_delete=models.DO_NOTHING)
description = models.TextField()
feature = models.TextField()
product_defect = models.TextField()
size = models.CharField(max_length=6)
height = models.DecimalField(max_digits=4, decimal_places=1, default=0)
weight = models.DecimalField(max_digits=4, decimal_places=1, default=0)
condition = models.CharField(max_length=20)
price = models.IntegerField()
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
sold_out = models.BooleanField(default=False)
def __str__(self):
return self.description
view.py
class ItemViewSet(ModelViewSet):
queryset = Item.objects.all()
serializer_class = ItemSerializer
filter_backends = [SearchFilter, OrderingFilter]
search_fields = ['description'] # ?search=
ordering_fields = ['created_at'] # ?ordering=
ordering = ['-created_at']
authentication_classes = (JWTCookieAuthentication,)
# create
def create(self, request, *args, **kwargs):
city = request.data['city']
gu = request.data['gu']
dong = request.data['dong']
if city is not None and gu is not None and dong is not None:
location = Location.objects.get(
Q(city=city) & Q(gu=gu) & Q(dong=dong)
)
else:
return Response(
{"message": "주소정보를 모두 입력해주세요."},
status=status.HTTP_400_BAD_REQUEST
)
serializer = self.get_serializer(data=request.data)
serializer.is_valid(raise_exception=True)
self.perform_create(serializer)
new_item = Item.objects.get(id=serializer.data['id'])
headers = self.get_success_headers(serializer.data)
LocationSet.objects.create(item_id=new_item, location_id=location)
return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)
# here!
def perform_create(self, serializer):
serializer.save(user_id=self.request.user)
serializers.py
class ItemSerializer(serializers.ModelSerializer):
photos = PhotoSerializer(source='photo_sets', many=True, read_only=True)
style_photos = StylePhotoSerializer(source='style_photo_sets', many=True, read_only=True)
user_id = serializers.ModelField(model_field=User()._meta.get_field('id'), required=False) #here!
class Meta:
model = Item
fields = '__all__'
# Photo, StylePhoto
def create(self, validated_data):
images_data = self.context['request'].FILES
item = Item.objects.create(**validated_data)
for photo_data in images_data.getlist('photos_data'):
Photo.objects.create(item_id=item, photo=photo_data)
for style_photo_data in images_data.getlist('style_photos_data'):
StylePhoto.objects.create(item_id=item, user_id=self.context['request'].user,
photo=style_photo_data)
print(User()._meta.get_field('id'))
return item
so I overrided perform_create() in views.py
and write 'user_id = serializers.ModelField(model_field=User()._meta.get_field('id'), required=False)' in serializers.py
but it doesn't work well like my intend...
correct user_id is 8. but my object has 18..:<
18 is just item_id, not user_id..
what should I do to fix this error?

Try this:
views.py : use the perform_create() method to save the user_id.
Note: the user must be authenticated so that we can get them from the request.
class ItemViewSet(ModelViewSet):
# your code ...
# create
def create(self, request, *args, **kwargs):
# your code code ...
def perform_create(self, serializer): # new
serializer.save(user_id=self.request.user)
serializers.py :
Get the user_id from the database and make it readonly as it is not supposed to be edited by the user:
class ItemSerializer(serializers.ModelSerializer):
# your code ..
user_id = serializers.ReadOnlyField(source='user_id.id') # new
class Meta:
model = Item
fields = '__all__'
# Photo, StylePhoto
def create(self, validated_data):
images_data = self.context['request'].FILES
item = Item.objects.create(**validated_data)
for photo_data in images_data.getlist('photos_data'):
Photo.objects.create(item_id=item, photo=photo_data)
for style_photo_data in images_data.getlist('style_photos_data'):
StylePhoto.objects.create(item_id=item,photo=style_photo_data) # new
print(User()._meta.get_field('id'))
return item
I would also recommend you change the user_id field to something like owner to prevent future confusion.

Serialize a queryset including the ForeignKey values

models.py:
class Project(models.Model):
project_code = models.CharField(max_length=250, null=False, blank=False)
description = models.CharField(max_length=1000, null=True, blank=True)
class ProjectManager(models.Model):
name = models.CharField(max_length=250, null=False, blank=False)
project_id = models.ForeignKey(
Project,
on_delete=models.CASCADE
)
views.py:
def ajax_search(request):
if request.method == 'GET':
category = request.GET['category']
if category == 'Project':
result = Project.objects.all()
data = serialize("json", result, cls=DatetimeJSONEncoder)
return HttpResponse(data, content_type="application/json")
else:
result = ProjectManager.objects.select_related('project_id').all()
data = serialize("json", result, cls=DatetimeJSONEncoder)
return HttpResponse(data, content_type="application/json")
return HttpResponse('')
return HttpResponse('')
I would like to return a json response with the content of ProjectManager + the content of the Project associated to that ProjectManager (ForeignKey).
According to what I have read in the Django documentation, to do a left join, the best thing to do would be to use select_related.
In fact, it works, but when I serialize ProjectManager, the Project values are not included in the JSON string. How could I put all into the JSON?

you can create serializers.py file and insert this code there
# import your models
from rest_framework import serializers
class ProjectSerializer(serializers.ModelSerializer):
class Meta:
model = Project
fields = "__all__"
class ProjectManagerSerializer(serializers.ModelSerializer):
project_id = ProjectSerializer(many=True)
class Meta:
model = ProjectManager
fields = "__all__"
# views.py
qs = ProjectManager.objects.select_related('project_id').all()
resp = ProjectManagerSerializer(qs, many=True).data

AttributeError at /apiv2/api/processorder/order/

I am trying to post multiple data into my DataBase Using Django Rest framework (DRF).
AttributeError at /apiv2/api/processorder/order/
Got AttributeError when attempting to get a value for field subcategory on serializer MyProcessOrderSerializer.
The serializer field might be named incorrectly and not match any attribute or key on the list instance.
Original exception text was: 'list' object has no attribute 'subcategory'.
models.py
class SubCategory(models.Model):
category = models.ForeignKey(Category, related_name='subcategory', on_delete=models.CASCADE)
name = models.CharField("Food Name", max_length=50, help_text="Name of The Food")
price = models.DecimalField("Food Price", max_digits=5, decimal_places=2)
quantity = models.PositiveIntegerField("Qty.", help_text="Quantity of the food Item you want")
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
def __str__(self):
return f'{self.name}'
class Meta:
verbose_name = 'SubCategory'
verbose_name_plural = 'SubCategories'
class Order(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
bike = models.ForeignKey(User, related_name='bike', on_delete=models.CASCADE, blank=True, null=True)
package = models.ForeignKey(PackageType, related_name='package', on_delete=models.CASCADE, blank=True, null=True)
total_price = models.DecimalField(max_digits=10, decimal_places=2, default=0000.0)
qty = models.PositiveIntegerField(default=1)
shipping_address = models.CharField("Delivery Address", max_length=150)
paid = models.BooleanField(default=False)
ordernote = models.TextField("Order Notes", null=True)
shipped = models.BooleanField(default=False)
complete = models.BooleanField(default=False)
received = models.BooleanField(default=False)
refund_requested = models.BooleanField(default=False)
refund_granted = models.BooleanField(default=False)
ref_code = models.CharField(max_length=20, blank=True, null=True)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
class Meta:
ordering = ('-created_at',)
def __str__(self):
return '{}'.format(self.id)
def order(self):
if not hasattr(self, '_order'):
self._order = self.order.all()
return self._order
'''
def get_total_cost(self):
total_cost = sum(orders.get_cost() for orders in self.order.all())
return total_cost
'''
class ProcessOrder(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
order = models.ForeignKey(Order, related_name='order', on_delete=models.CASCADE)
quantity = models.PositiveIntegerField("Qty.", default=1, help_text="Quantity of the food Item you want")
#category = models.ForeignKey(Category, related_name='category', on_delete=models.CASCADE)
subcategory = models.ForeignKey(SubCategory, on_delete=models.CASCADE)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
def __str__(self):
return f'{self.order} -- {self.subcategory.name}'
serializers.py
class MyProcessOrderSerializer(serializers.ModelSerializer):
#subcategory_name = serializers.RelatedField(source='subcategory.id', read_only=True)
#subcategory_set = SubCategoryOrderSerializer(many=True)
class Meta:
model = ProcessOrder
fields = ('quantity', 'subcategory', 'user')
read_only_fields = ('user', )
def create(self, validated_data):
return ProcessOrder.objects.create(**validated_data)
view.pf
#api_view(['POST'])
#permission_classes([IsAuthenticated])
def processorder_view(request):
orderuser = User.objects.get(id=request.user.id)
serializer = MyProcessOrderSerializer(data=request.data, many=True)
if serializer.is_valid():
order = Order.objects.create(user=orderuser, ref_code=create_ref_code())
order.save()
processorder = serializer.save(order=order, user=orderuser)
return Response(MyProcessOrderSerializer(processorder).data, status=status.HTTP_201_CREATED)
else: #return Response("Process Order Created Successfully")
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
I am now trying to make a POST such as this but getting the above error.
[{
"quantity": 16,
"subcategory": 1
},
{
"quantity": 14,
"subcategory": 3
}
]

You have to explicitly specify the relation in the serializer either with one of the built-in serializer:
Serializer relations
class MyProcessOrderSerializer(serializers.ModelSerializer):
# StringRelatedField and PrimaryKeyRelatedField are some of the built in ones.
subcategory = serializers.StringRelatedField(source='subcategory.id', read_only=True)
user = serializer.PrimaryKeyRelatedField()
class Meta:
model = ProcessOrder
fields = ('quantity', 'subcategory', 'user')
read_only_fields = ('user', )
def create(self, validated_data):
# If you want to accect new subcategory object via the endpoint you need further action here, see the docs.
return ProcessOrder.objects.create(**validated_data)
or by creating a custom subcategory serializer and then in serializer:
class UserSerializer(serializers.ModelSerializer):
class Meta:
fields = ('id', 'email', 'password', 'first_name', 'last_name')
class SubCategorySerializer(serializers.ModelSerializer):
class Meta:
fields = # whatever fields youd'e like to include
class MyProcessOrderSerializer(serializers.ModelSerializer):
# StringRelatedField is One of the built in ones.
sybcategory = SubCategorySerializer()
user = UserSerializer()
class Meta:
model = ProcessOrder
fields = ('quantity', 'subcategory', 'user')
read_only_fields = ('user', )
def create(self, validated_data):
# If you want to accect new subcategory object via the endpoint you need further action here, see the docs.
return ProcessOrder.objects.create(**validated_data)
And, I noticed you have Foreign Key to User in process order and order itself,
You could delete the user field from the process order and access it via the order relation, for that you can specify the user field in the subcategory serializer and the subcategory serializer in the process order serializer as I showed above.
And if I understand the purpose of creating a process order model, the relation should be a One to One and not Foreign key, But maybe I'm not seeing the whole picture here.

I think the problem apear in request.data in this line :
serializer = MyProcessOrderSerializer(data=request.data, many=True)
You should loop throught your object list and pass just the object not the whole list .
exemple :
{ "list_":[{"quantity": 7 ,"subcategory": 3}, {"quantity": 7 ,"subcategory": 3}] }
To get the first object from the request :
request.data.get('list_')[0]

I was able to solve the problem with this code both in my views and serialize
views.py
#api_view(['POST'])
#permission_classes([IsAuthenticated])
def processorder_view(request):
orderuser = User.objects.get(id=request.user.id)
data = request.data
order = Order.objects.create(user=orderuser, ref_code=create_ref_code())
if isinstance(data, list):
serializer = MyProcessOrderSerializer(data=request.data, many=True)
else:
serializer = MyProcessOrderSerializer(data=request.data)
if serializer.is_valid():
processorder = serializer.save(order=order, user=request.user)
return Response(status=status.HTTP_201_CREATED)
#return HttpResponse("Question created", status=201)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
serializers.py
class MyProcessOrderSerializer(serializers.ModelSerializer):
#subcategory_name = serializers.RelatedField(source='subcategory.id', read_only=True)
#subcategory_set = SubCategoryOrderSerializer(many=True)
#subcategory = serializers.StringRelatedField(source='subcategory.id', read_only=True)
class Meta:
model = ProcessOrder
fields = ('quantity', 'subcategory', 'user')
read_only_fields = ('user', )
def create(self, validated_data):
return ProcessOrder.objects.create(**validated_data)
Then, I was able to send multiple data with this sample.
[
{
"subcategory": 1,
"quantity": 12
},
{
"subcategory": 3,
"quantity": 12
}
]

How can i fix "too many values to unpack" value error while file uploading in model serializer

I'm facing below issue in ModelSerializer file upload.
Issue 1) I'm trying to upload files using ModelSerializer. I have two models BlogFilesSerializer and BlogSerializer. when trying to upload a file it shows too many values to unpack error and I know its meaning why is this occurring but don't know how to handle these exceptions.
serializers.py
class BlogFilesSerializer(ModelSerializer):
created_at = serializers.SerializerMethodField()
updated_at = serializers.SerializerMethodField()
class Meta:
model = BlogFilesModel
fields = ('blog_files_id', 'blog', 'path',
'created_at', 'updated_at')
class BlogSerializer(ModelSerializer):
blog_files = serializers.SerializerMethodField()
uploaded_files = serializers.FileField(required=True, source='*')
blog_created_at = serializers.SerializerMethodField()
def get_blog_files(self, obj):
info = BlogFilesSerializer(BlogFilesModel.objects.filter(
blog=obj).order_by('-pk'), many=True)
if info.data:
for i in info.data:
user_detail = User.objects.get(pk=obj.user.id)
i.__setitem__('user_detail', UserSerializer(user_detail).data)
if i.get('user_detail'):
try:
del i['user_detail']['password']
except expression as identifier:
pass
return info.data
def get_blog_created_at(self, obj):
formatted_date = obj.created_at.strftime("%d-%m-%Y")
return formatted_date
class Meta:
model = BlogModel
fields = ('blog_id', 'user', 'title', 'content',
'status',
'blog_files', 'blog_created_at',
'uploaded_files'
)
def create(self, validated_data):
instance = BlogModel.objects.create(**validated_data)
return instance
views.py
class BlogViewSet(viewsets.ModelViewSet):
queryset = BlogModel.objects.all()
lookup_field = 'blog_id'
serializer_class = BlogSerializer
parser_classes = (MultiPartParser, FormParser,FileUploadParser)
models.py
class BlogModel(models.Model):
BLOG_STATUS = (
('PUBLISH', 'Publish'),
('DRAFT', 'Draft'),
)
blog_id = models.AutoField(primary_key=True)
user = models.ForeignKey(
User, on_delete=models.CASCADE, related_name='blogs')
title = models.CharField(max_length=255)
content = models.TextField(blank=True, null=True)
status = models.CharField(max_length=7, choices=BLOG_STATUS)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
class Meta():
db_table = 'blogs'
verbose_name = 'Blog'
verbose_name_plural = 'Blogs'
def __str__(self):
return self.title
#property
def files(self):
return 'something'
def blog_directory_path(instance, filename):
return 'uploads/blogs/{}'.format(filename+str(datetime.now()))
class BlogFilesModel(models.Model):
blog_files_id = models.AutoField(primary_key=True)
blog = models.ForeignKey(
BlogModel, on_delete=models.CASCADE, related_name='blogs',blank=True)
path = models.FileField(blank=False, null=False,upload_to=blog_directory_path)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
class Meta():
db_table = 'blog_files'
verbose_name = 'Blog'
verbose_name_plural = 'Blogs'
def __str__(self):
return str(self.path)
Issue 2) i'm also unable to select multiple files for upload in BlogSerializer and in field uploaded_files = serializers.FileField(required=True, source='*') and their is no detailed explanation is DRF documentation. How can i add multple attribute to file field.
EDIT 1: I tried and got till here in def to_internal_value(self, data): the field.source_attrs = [] their is no key so i'm getting this error.
in my ModelSerializer i tried this uploaded_files = serializers.FileField(required=True, source='files') added files as property to BlogModel now i'm getting 'Error = files' is an invalid keyword argument for this function can someone guide me here.
Hope is have explained my problem well.
Thank you.

Django restful create api marks a new entry as edited on creation

I have been working on tracking edit history of comments in my app using django-simple-history, I have been able to track the edited comments but just realized that am also tracking entries upon creation. ie new entries are added to the history table on creation.
my model
class Comments(models.Model):
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateField(auto_now=True)
body = models.TextField(max_length=200)
is_Child = models.BooleanField(default=False)
author = models.ForeignKey(User, related_name='author_rel',
on_delete=models.CASCADE)
article = models.ForeignKey(Article, related_name='comments',
on_delete=models.CASCADE, null=False)
parent = models.ForeignKey('self', null=True, blank=True,
on_delete=models.CASCADE, related_name='threads')
history = HistoricalRecords()
def __str__(self):
return str(self.body)
class Meta:
ordering = ['-created_at']
My view class
class CommentsListView(ListCreateAPIView):
serializer_class = CommentSerializer
permission_classes = (IsAuthenticatedOrReadOnly,)
queryset = Comments.objects.all()
renderer_classes = (CommentJSONRenderer,)
def create(self, request, slug, *args, **kwargs):
serializer_context = {
'request': request,
'article': get_object_or_404(Article, slug=self.kwargs["slug"])
}
article = Article.objects.filter(slug=slug).first()
data = request.data
serializer = self.serializer_class(
data=data, context=serializer_context)
serializer.is_valid(raise_exception=True)
serializer.save(author=self.request.user, article_id=article.pk)
return Response(serializer.data, status=status.HTTP_201_CREATED)

That's part of django-simple-history behavior but what you could do is delete that type of records in a signal if you do not want to store that information.
from django.dispatch import receiver
from simple_history.signals import (
post_create_historical_record
)
#receiver(post_create_historical_record)
def post_create_historical_record_callback(sender, **kwargs):
history_instance = kwargs['history_instance']
if history_instance.get_history_type_display() == "Created":
history_instance.delete()