I'm trying to figure out if it's possible to create a ModelAdmin with multiple nested inlines like:
Contract
Mainproduct
Subproduct1
Subproduct2
SubSubproduct
And I'm also trying to solve the models with mptt.
My models are looking like this:
class Contract(models.Model):
contractnumber = models.CharField(max_length=25)
field2 = models.CharField(max_length=25)
field3 = models.CharField(max_length=25)
field4 = models.CharField(max_length=25)
def __str__(self):
return self.field1
class Meta:
verbose_name = 'Contract'
verbose_name_plural = 'Contracts'
class Mainproduct(MPTTModel):
pr_c_contractnumber = models.ForeignKey(Contract)
pr_name = models.Charfield(max_length=50)
productdetails = models.Textfield(max_length=5000)
pr_sernr = models.CharField(max_length=50)
parent = TreeForeignKey('self', null=True, blank=True, related_name='children', db_index=True,
on_delete=models.SET_NULL)
def __str__(self):
return self.pr_c_contractnumber, self.pr_name
class MPTTMeta:
order_insertation_by = ['pr_sernr']
class Meta:
verbose_name = 'Product'
verbose_name_plural = 'Products'
My admin.py file is looking like this:
class ProductModelInlineForm(forms.ModelForm):
parent = TreeNodeChoiceField(queryset=Product.objects.all())
class ProductModelInline(admin.TabularInline):
model = Product
form = ProductModelInlineForm
extra = 1
class ProductAdmin(admin.ModelAdmin):
inlines = [ProductModelInline, ]
class ProductInline(admin.TabularInline):
model = Product
extra = 1
class ContractAdmin(admin.ModelAdmin):
inlines = [ProductInline, ]
Is there a way to create these nested inlines? Am I missing something important?
Just use MPTTModelAdmin and it will do it automatically:
from mptt.admin import MPTTModelAdmin
admin.site.register(Mainproduct, MPTTModelAdmin)
Related
I have this model that represents a bookmark or favorite. It has multiple foreign keys to other models. In the api I would like to pull in the data from each of the models that is referenced in the particular bookmark.
The model:
class Bookmark(models.Model):
marktype = models.CharField(max_length=10)
post = models.OneToOneField(Post, on_delete=models.CASCADE, null=True, blank=True)
question = models.OneToOneField(Question, on_delete=models.CASCADE, null=True, blank=True)
owner = models.ForeignKey(User, on_delete=models.CASCADE)
created_at = models.DateTimeField(auto_now_add=True, verbose_name="created at")
updated_at = models.DateTimeField(auto_now=True, verbose_name="updated at")
class Meta:
verbose_name = "bookmark"
verbose_name_plural = "bookmarks"
ordering = ["created_at"]
db_table = "bookmarks"
def __str__(self):
return "{}'s bookmark".format(self.owner.username)
I tried to use a SerializerMethodField but I get an error: 'NoneType' object has no attribute 'id'
Here is the serializer
class BookmarkSerializer(serializers.ModelSerializer):
post = serializers.SerializerMethodField()
question = serializers.SerializerMethodField()
class Meta:
model = Bookmark
fields = '__all__'
def get_post(self, obj):
obj = Post.objects.get(id=obj.post.id)
post = ShortPostSerializer(obj)
return post.data
def get_question(self, obj):
obj = Question.objects.get(id=obj.question.id)
question = ShortQuestionSerializer(obj)
return question.data
what am I doing wrong please?
You can update your serializer like the following (You can short it as you want or use your ShortQuestionSerializer as well instead of QuestionSerializer),
class QuestionSerializer(serializers.ModelSerializer):
class Meta:
model = Question
fields = '__all__'
class PostSerializer(serializers.ModelSerializer):
class Meta:
model = Post
fields = '__all__'
class BookmarkSerializer(serializers.ModelSerializer):
post = PostSerializer()
question = QuestionSerializer()
class Meta:
model = Bookmark
fields = '__all__'
I'm trying to show my all children category from parent category. I want to just hit one API end and show all tables which is related to that item. I want to hit "Master-Category" and show all releated "Category","Sub-Category" and "Root-Item" in Hierarchy form. I display all the data but cannot in Hierarchy form. Can anyone please give me the solution for this problem.
Model.py
from django.db import models
from django.contrib.auth.models import User
class MasterCategory(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE, null=True, blank=True,
verbose_name="Created By")
title = models.CharField(max_length=100, null=False, blank=False)
description = models.TextField(default='')
def __str__(self):
return str(self.title)
#property
def category(self):
data = NewCategory.objects.filter(master_category__id=self.id).values
return data
#property
def sub_category(self):
data = NewSubcategory.objects.filter(category__id=self.id).values
return data
#property
def root_item(self):
data = Rootitem.objects.filter(sub_category__id=self.id).values
return data
class NewCategory(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE, null=True, blank=True,
verbose_name="Created By")
title = models.CharField(max_length=100, null=False, blank=False)
description = models.TextField(default="")
master_category = models.ForeignKey(
MasterCategory, on_delete=models.CASCADE, null=True, blank=True)
def __str__(self):
return str(self.title)
class NewSubcategory(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE, null=True, blank=True,
verbose_name="Created By")
title = models.CharField(max_length=100, null=False, blank=False)
description = models.TextField(default="")
category = models.ForeignKey(NewCategory, on_delete=models.CASCADE, null=True,
blank=True)
def __str__(self):
return str(self.title)
class Rootitem(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE, null=True, blank=True,
verbose_name="Created By")
title = models.CharField(max_length=100, null=False, blank=False)
description = models.TextField(default="")
sub_category = models.ForeignKey(NewSubcategory, on_delete=models.CASCADE,
null=True, blank=True)
def __str__(self):
return str(self.title)
Serializers.py
I add #property function name in MasterCategorySerializer fields, "category", "sub_category", "root_item"
from .models import MasterCategory, NewCategory, NewSubcategory, Rootitem
from rest_framework import serializers
class MasterCategorySerializer(serializers.ModelSerializer):
class Meta:
model = MasterCategory
fields = ["title", 'category', 'sub_category', 'root_item']
class NewCategorySerializer(serializers.ModelSerializer):
class Meta:
model = NewCategory
fields = "__all__"
class NewSubcategorySerializer(serializers.ModelSerializer):
new_cat = NewCategorySerializer(source='category',read_only=True, many=True)
class Meta:
model = NewSubcategory
fields = "__all__"
class RootitemSerializer(serializers.ModelSerializer):
class Meta:
model = Rootitem
fields = "__all__"
**Viewset.py**
from API_app.models import MasterCategory
from API_app.serializers import MasterCategorySerializer
from rest_framework import viewsets
class MasterCategoryViewSet(viewsets.ModelViewSet):
queryset = MasterCategory.objects.all()
serializer_class = MasterCategorySerializer
My Desired Output, what i want.
{
Electronics <---- Master-Category
{
Smart-Phone <---- Category
{
Samsung <---- Sub-Category
{
Samsung S20 Ultra <---- Root-Item
}
}
}
}
Change your serializers as below. For this nested structure you don't need properties. As tables are connected with foreign key you can define related name between models and assign to its serializer. Default related name between table is tablename_set.
class RootitemSerializer(serializers.ModelSerializer):
class Meta:
model = Rootitem
fields = "__all__"
class NewSubcategorySerializer(serializers.ModelSerializer):
rootitem_set = RootitemSerializer(many=True)
class Meta:
model = NewSubcategory
fields = "__all__"
class NewCategorySerializer(serializers.ModelSerializer):
newsubcategory_set = NewSubcategorySerializer(many=True)
class Meta:
model = NewCategory
fields = "__all__"
class MasterCategorySerializer(serializers.ModelSerializer):
newcategory_set = NewCategorySerializer(many=True)
class Meta:
model = MasterCategory
fields = "__all__"
We have relationship between MasterCategory and NewCategory. As you don't define related_name therefore related name is newcategory_set and its response is NewCategorySeralizer. Make many=True because they are related with foreign key as there can be multiple newcategory related to mastercategory. Other relations are same as above explanation.
If you want to change this default related name then look at related_name, you can define it inside models.ForeignKey()
I have 3 models:
class Artist(Timestamps):
name = models.CharField('Name', max_length=255, blank=True)
...
class Festival(Timestamps):
name = models.CharField(max_length=255, blank=True)
...
class Event(Timestamps):
artist = models.ForeignKey(Artist, on_delete=models.CASCADE, null=True)
festival = models.ForeignKey(Festival, on_delete=models.CASCADE, null=True)
Now I wan't all the id's from the festivals an artist is playing. I have a serializer like this:
class ArtistFestivalSerializer(serializers.ModelSerializer):
class Meta:
model = Artist
fields = ('id', 'name', 'event_set')
But this only gives me the id's of the event. Any ideas how to get trough the Event to the Festival?
Thanks in advance
EDIT - the view is:
class FestivalArtists(generics.ListAPIView):
serializer_class = ArtistFestivalSerializer
def get_queryset(self):
queryset = Artist.objects.prefetch_related('event_set').filter(event__isnull=False).distinct().order_by('name')
return queryset
I think you need to add the custom field for that.
class ArtistFestivalSerializer(serializers.ModelSerializer):
festival_ids = serializers.SerializerMethodField(read_only = True)
class Meta:
model = Artist
fields = ('id', 'name', 'event_set', 'festival_ids')
def get_festival_ids(self, obj):
return list(Event.objects.filter(artist = obj).values_list('festival_id').distinct())
I'm trying to serialize nested relations, but got an error during create model from request: 'MeasureUnit' object has no attribute 'unit'
What am I doing wrong? I'm just trying to create model MeasureItem, but got error in MeasureUnit somehow.
My models:
from django.db import models
from measure_unit.models import MeasureUnit
from main_user.models import MainUser
class Item(models.Model):
code = models.CharField(unique=True, max_length=15)
current_code = models.CharField(blank=True, null=True, max_length=15)
title = models.CharField(default='', max_length=100)
description = models.TextField(blank=True, null=True)
measure_units = models.ManyToManyField(MeasureUnit, through='MeasureItem', through_fields=('item', 'unit'), blank=True)
class Meta:
ordering = ('created_at',)
class MeasureItem(models.Model):
item = models.ForeignKey(Item, on_delete=models.CASCADE, blank=True, null=True)
unit = models.ForeignKey(MeasureUnit, on_delete=models.CASCADE, blank=True, null=True)
quantity = models.IntegerField(default=0)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
class Meta:
ordering = ('created_at',)
My serializer:
from rest_framework import serializers
from .models import Item, MeasureItem
class MeasureUnitSerializer(serializers.ModelSerializer):
class Meta:
model = MeasureItem
fields = ('id', 'unit')
class ItemAdminSerializer(serializers.ModelSerializer):
measure_units = MeasureUnitSerializer(many=True)
class Meta:
model = Item
fields = ('id', 'code', 'current_code', 'title', 'description', 'measure_units')
def create(self, validated_data):
units_data = validated_data.pop('measure_units')
item = Item.objects.create(**validated_data)
for unit_data in units_data:
try:
measure_unit = unit_data['unit']
MeasureItem.objects.create(unit=measure_unit, item=item)
except Exception as e:
print(str(e))
return item
return item
MeasureUnitSerializer is ModelSerializer for MeasureItem model, but you use it for MeasureUnit model in ItemAdminSerializer:
measure_units = MeasureUnitSerializer(many=True)
Since MeasureUnit doesn't have unit field you see error.
You could try to specify source argument of measure_units field:
measure_units = MeasureUnitSerializer(source='measureitem_set', many=True)
I have the following admin.py
class AInlineAdmin(admin.TabularInline):
model = A
class BAdmin(admin.ModelAdmin):
fields = ['name']
list_display = ['name']
ordering = ['name']
inlines = [AInlineAdmin]
admin.site.register(B, BAdmin)
class AAdmin(admin.ModelAdmin):
fields = ['identifier']
list_display = ['identifier']
ordering = ['identifier']
admin.site.register(A, AAdmin)
And the following models.py:
class B(models.Model):
name = models.CharField(max_length=100)
def get_A(self):
return "\n".join([i.identifier for i in self.a.all()])
def __unicode__(self):
return self.name
class A(models.Model):
identifier = models.CharField(max_length=200, blank=False, default="")
c = models.ForeignKey(B, related_name='a', default=0)
def __unicode__(self):
return self.identifier
And the following views.py:
class BCreate(CreateView):
model = B
fields = ['name', 'a']
But it is not working with 'a' inside "fields = ['name', 'a']", as 'a' is not found.
How can I get inlines into the view so I could edit/delete/create A inside B view?
The CreateView does not support this. You could use django-extra-views, which comes with CreateWithInlinesView and UpdateWithInlinesView views.