Develop Reference

Value Error: Field 'id' expected a number but got 'create'

I was in the process of making a create gallery image field in Django for my project, but when I try to access the url, I'm getting a Field 'id' expected a number but got 'create'. error. And on postman, I'm getting a { detail: "Method \"POST\" not allowed." }.
class Gallery(models.Model):
SUBTLEPBR = "subtle"
AMULET = "amulet"
F8THFULPBR = "f8thfulpbr"
user = models.ForeignKey(User, on_delete=models.SET_NULL, null=True)
screenshot_by = models.CharField(max_length=200, null=False, blank=False)
image = WEBPField(
verbose_name=('Image'),
upload_to=image_folder,
default="placeholder.png"
)
PACKS = [
(SUBTLEPBR, 'SubtlePBR'),
(AMULET, 'Amulet'),
(F8THFULPBR, 'F8thfulPBR'),
]
pack = models.CharField(max_length=10, choices=PACKS)
def __str__(self):
return "Screenshot by "+ self.screenshot_by + " | " + self.pack
#api_view(["POST"])
#permission_classes([IsAdminUser])
def createGalleryImage(request):
user = request.user
gallery = Gallery.objects.create(
user = user,
screenshot_by = "John Doe",
pack = Gallery.SUBTLEPBR,
)
serializer = GallerySerializer(gallery, many=False)
return Response(serializer.data)
urlpatterns = [
path('admin/users/login/', views.MyTokenObtainPairView.as_view(), name='token_obtain_pair'),
path('', views.getRoutes, name='routes'),
path("gallery/", views.GalleryImages, name="gallery"),
path("gallery/<str:pk>/", views.getGalleryImage, name="gallery-image"),
path("gallery/delete/<str:pk>/", views.deleteGalleryImage, name="gallery-delete"),
path("gallery/create/", views.createGalleryImage, name="gallery-create"),
path("updates/", views.PackUpdatesPage, name="updates"),
path("faq/", views.FaqPage, name="faq"),
path("subtle-roadmap/", views.SubtleRoadmapPage, name="subtle-roadmap"),
path("amulet-roadmap/", views.AmuletRoadmapPage, name="amulet-roadmap"),
path('admin/users/profile/', views.getUserProfile, name="user-profile")
]
The output that is supposed to happen is
{
"id": 51,
"screenshot_by": "Person",
"image": "/placeholder.png",
"pack": "subtle",
"user": 1
}
(added entire urls code to include entirety of paths)

This will "fire" the wrong view. Indeed, if you use /gallery/create, it will fire getGalleryImage with create as pk.
If the primary keys are integers, you can restrict these with:
urlpatterns = [
path('gallery/<int:pk>/', views.getGalleryImage, name='gallery-image'),
path(
'gallery/delete/<int:pk>/',
views.deleteGalleryImage,
name='gallery-delete',
),
path('gallery/create/', views.createGalleryImage, name='gallery-create'),
# …
]
This will then only "fire" if pk is a sequence of digits, like 1425, not create.

django-elasticsearch-dsl does not return all records that match the query condition

I'm writing a site on Django. I'm developing a site search system using django-elasticsearch-dsl. But I noticed a problem that not all records that meet the search condition are displayed.
For example, I know that I have 6 books in my database that contain the word 'Python', but when I use the command
books = BookDocument.search().query('match', title='Python')
django-elasticsearch-dsl gives me only 3 entries
books = BookDocument.search().query('match', title='Python')
for i in books:
print(i.title)
|||||||||||||
Укус Python
Програмуємо на Python
Django:Практика створення Web-сайтів на Python
And the remaining 3 are not displayed
Here is my BookDocument class:
#registry.register_document
class BookDocument(Document):
"""
Індексація таблиці БД Book для Elasticsearch-пошуку
Згідно із документацією django-elasticsearch-dsl
https://django-elasticsearch-dsl.readthedocs.io/en/latest/fields.html
"""
image = FileField()
category = ObjectField(properties={
'title': TextField(),
'pk': IntegerField()
})
authors = NestedField(properties={
'pk': IntegerField(),
'name': TextField()
})
class Index:
name = 'book'
settings = {
'number_of_shards': 1,
'number_of_replicas': 0
}
class Django:
model = Book
fields = [
'id',
'title',
'description',
]
related_models = [Category, Author]
def get_instances_from_related(self, related_instance):
if isinstance(related_instance, Category):
return related_instance.book_set.all()
if isinstance(related_instance, Author):
return related_instance.book_set.all()
Maybe someone has already encountered this and knows how to fix it

read_only but still populated in create method on serializer

I have a custom create method on my serializer for adding tags where the consumer could solely send a payload with the tags key containing a list of tags' names.
{
"id": 1,
"title": "Testing",
...
"tags": ["Python", "Django", "Go"]
}
Serializer:
class StreamSerializer(serializers.HyperlinkedModelSerializer):
streamer = StreamerSerializer()
tags = TagSerializer(many=True)
class Meta:
model = Stream
fields = [
"id",
"source",
"stream_id",
"started_at",
"collected_at",
"title",
"thumbnail_url",
"viewer_count",
"video_type",
"language",
"streamer",
"stream_data",
"tags",
"live_now",
]
extra_kwargs = {"tags": {"validators": []}}
def create(self, validated_data):
# pop streamer and tags from the payload
print(validated_data)
streamer_data = validated_data.pop("streamer")
tag_names = validated_data.pop("tags")
# get_or_create the streamer for this stream
streamer_user_id = streamer_data.pop("user_id")
streamer, created = Streamer.objects.get_or_create(
user_id=streamer_user_id, defaults=streamer_data
)
# use get_or_create on the stream to prevent duplicates if stream
# crashes or a node change and just update the existing stream
# with new data instead.
stream, created = Stream.objects.get_or_create(
streamer=streamer, defaults=validated_data
)
# add tags to the newly created stream
for tag_name in tag_names:
tag = Tag.objects.get(name=tag_name)
stream.tags.add(tag.id)
stream.save()
return stream
I would like for tags to have read_only=True, but by doing this I get a KeyError when posting to this endpoint since this is now excluded from any write methods.
class StreamSerializer(serializers.HyperlinkedModelSerializer):
streamer = StreamerSerializer()
tags = TagSerializer(many=True, read_only=True) # add read_only
...
What could I do in order to not have tags necessary to validate, but still have access to the field in my create method? Would I need a custom validator for this?

This doesn't exactly answer the question, but does achieve the goal I'm going for using to_internal_value on my TagSerializer.
class TagSerializer(serializers.HyperlinkedModelSerializer):
parent = ParentTagSerializer()
class Meta:
model = Tag
fields = ["name", "aliases", "parent"]
extra_kwargs = {"aliases": {"validators": []}}
# to_internal_value will iterate each tag name in the post payload
# and return the tag matching that name.
def to_internal_value(self, tag_name):
tag = Tag.objects.get(name=tag_name)
return tag
class StreamSerializer(serializers.HyperlinkedModelSerializer):
streamer = StreamerSerializer()
tags = TagSerializer(many=True)
...

How can I add a document on a StreamField in Wagtail CMS?

I've a question about Wagtail CMS.
Recently I'm trying to import programmatically some documents in a StreamField of an instance of a Wagtail Page model. I've done some researches but without results.
Currently I'm using:
Wagtail 1.13
Django 1.11.6
Python 2.7
Here the model of the page in which I need to import the documents as attachments (see the homonym field):
class EventPage(TranslatablePage, Page):
# Database fields
uuid = models.UUIDField(verbose_name='UUID', default=uuid.uuid4)
start_date = models.DateField(verbose_name='Start date')
end_date = models.DateField(verbose_name='End date')
location = models.CharField(verbose_name='Place', max_length=255, null=True, blank=True)
body = RichTextField(verbose_name='Body')
attachments = StreamField(blocks.StreamBlock([
('document', DocumentChooserBlock(label='Document', icon='doc-full-inverse')),
]), verbose_name='Attachments', null=True, blank=True)
subscribe = models.BooleanField(verbose_name='Subscribe option', default=False)
# Editor panels configuration
content_panels = [
FieldPanel('title', classname='title'),
MultiFieldPanel([
FieldRowPanel([
FieldPanel('start_date'),
FieldPanel('end_date'),
]),
], heading='Period'),
FieldPanel('location'),
FieldPanel('body'),
StreamFieldPanel('attachments'),
]
promote_panels = Page.promote_panels + [
MultiFieldPanel([
FieldPanel('subscribe'),
], heading='Custom Settings'),
]
settings_panels = TranslatablePage.settings_panels + [
MultiFieldPanel([
FieldPanel('uuid'),
], heading='Meta')
]
parent_page_types = ["home.FolderPage"]
subpage_types = []
On shell, I tried to apply the solution explained on this page but without success.
event = EventPage.objects.get(pk=20)
doc = Document.objects.get(pk=3)
event.attachments = [
('document',
[
StreamValue.StreamChild(
id = None,
block = DocumentChooserBlock(),
value = doc
)
]
)
]
Python give me this error: AttributeError: 'list' object has no attribute 'pk'.

event.attachments = [('document', doc)] should work, I believe. (On the other question you link to, StreamChild was necessary because AccordionRepeaterBlock was a StreamBlock nested in a StreamBlock; that's not the case for your definition.)
To add a document to the existing StreamField content, build a new list and assign that to event.attachments:
new_attachments = [(block.block_type, block.value) for block in blocks]
new_attachments.append(('document', doc))
event.attachments = new_attachments
(Currently you can't append directly to a StreamField value, but this may well be supported in a future Wagtail release...)

Django REST serialize output - group by foreign keys

I have models like below.
Restaurant Model
class Restaurant(models.Model):
name = models.CharField(max_length=40, verbose_name='Name')
Menu Model
class Menu(models.Model):
name = models.CharField(max_length=40, unique=True, verbose_name='menu name')
Item Model
class Item(models.Model):
restaurant = models.ForeignKey(Restaurant)
menu = models.ForeignKey(Menu)
name = models.CharField(max_length=500)
price = models.IntegerField(default=0)
I want to get the menus for the shop id.
How can I group my results by menu for the restaurant id ?
call GET /menus/restaurant_id
Sample.
{
name: menu name 1
items: [ {item1}, {item2}]
},
{
name: menu name 2
items: [ {item1}, {item2}]
}
Thanks..

The only thing i can find it's postgres specific aggregation function ArrayAgg
You can use it like this:
from django.contrib.postgres.aggregates import ArrayAgg
Item.objects.filter(restaurant_id=1).values('menu__name').annotate(items=ArrayAgg('name'))
# example output:
# [
# {
# 'menu__name': 'menu1',
# 'items': ['item1', 'item2']
# },
# {
# 'menu__name': 'menu2',
# 'items': ['item3', 'item4']
# },
# ]
Such qs performs next raw sql query:
SELECT
"appname_menu"."name",
ARRAY_AGG("appname_item"."name") AS "items"
FROM "appname_item"
INNER JOIN "appname_menu" ON ("appname_item"."menu_id" = "appname_menu"."id")
WHERE "appname_item"."restaurant_id" = 1
GROUP BY "appname_menu"."name"
Probably it can help you.