Following this link and documentation, somehow it still can't save an Object with 2 Foreinkeys.
class Photo(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE, null=True) #User.photo_set.all() returns all Photo objects of the photo
photoURL = models.CharField(max_length=256, null=True)
secondPhoto = models.OneToOneField('self', on_delete=models.PROTECT, null=True, blank=True)
timestamp = models.DateTimeField(auto_now_add=True)
description = models.CharField(max_length=1000, null=True)
is_private = models.BooleanField(default=False)
class Clash(models.Model):
win_photo = models.ForeignKey(Photo,on_delete=models.PROTECT, related_name="wins", null=True)
loss_photo = models.ForeignKey(Photo,on_delete=models.PROTECT, related_name="losses", null=True)
is_private = models.BooleanField(default=False) #we will filter those out for user quality calculations
Related
The three models relevant to this question are:
class MaterialList(models.Model):
org = models.ForeignKey(Organizations, on_delete=models.RESTRICT, blank=True)
Material = models.CharField(max_length=100)
Description = models.CharField(max_length=250, blank=True)
PartType = models.ForeignKey(WhsePartTypes, null=True, on_delete=models.RESTRICT)
Price = models.FloatField(null=True, blank=True)
PriceUnit = models.PositiveIntegerField(null=True, blank=True)
TypicalContainerQty = models.IntegerField(null=True, blank=True)
TypicalPalletQty = models.IntegerField(null=True, blank=True)
Notes = models.CharField(max_length=250, blank=True)
UniqueConstraint('org', 'Material')
class Meta:
ordering = ['org','Material']
class CountSchedule(models.Model):
org = models.ForeignKey(Organizations, on_delete=models.RESTRICT, blank=True)
CountDate = models.DateField(null=False)
Material = models.ForeignKey(MaterialList, on_delete=models.RESTRICT)
Counter = models.CharField(max_length=250, blank=True)
Priority = models.CharField(max_length=50, blank=True)
ReasonScheduled = models.CharField(max_length=250, blank=True)
Notes = models.CharField(max_length=250, blank=True)
UniqueConstraint('org', 'CountDate', 'Material')
class Meta:
ordering = ['org','CountDate', 'Material']
class ActualCounts(models.Model):
org = models.ForeignKey(Organizations, on_delete=models.RESTRICT, blank=False)
CountDate = models.DateField(null=False)
CycCtID = models.CharField(max_length=100, blank=True)
Material = models.ForeignKey(MaterialList, on_delete=models.RESTRICT)
Counter = models.CharField(max_length=250, blank=False, null=False)
LocationOnly = models.BooleanField(blank=True, default=False)
CTD_QTY_Expr = models.CharField(max_length=500, blank=False)
BLDG = models.CharField(max_length=100, blank=True)
LOCATION = models.CharField(max_length=250, blank=True)
PKGID_Desc = models.CharField(max_length=250, blank=True)
TAGQTY = models.CharField(max_length=250, blank=True)
FLAG_PossiblyNotRecieved = models.BooleanField(blank=True, default=False)
FLAG_MovementDuringCount = models.BooleanField(blank=True, default=False)
Notes = models.CharField(max_length = 250, blank=True)
class Meta:
ordering = ['org', 'CountDate', 'Material']
These models arise from a migration from a non-Python system to a Python-Django driven system. Most of the time, I only need the forward relations CountSchedule.Material and ActualCounts.Material. There is one report my bosses L_O_V_E, however. This report joins ActualCounts and CountSchedule where ActualCounts.CountDate=CountSchedule.CountDate and ActualCounts.Material=CountSchedule.Material. (Actually, the report has 3 sections, which boil down to a LEFT JOIN, a RIGHT JOIN and an INNER JOIN. For now, I just need help with any of these as a start).
For the moment, I'm going with raw SQL, but I'd like to know if the ORM has a solution.
Any advice?
I've already tried
M = MaterialList.objects.select_related('actualcounts_set', 'countschedule_set').filter(org=_userorg, actualcounts__CountDate=datestr, countschedule__CountDate=datestr)
which resulted in
Invalid field name(s) given in select_related: 'countschedule_set', 'actualcounts_set'. Choices are: org, PartType
Please I'm trying to implement a SIMPLE messaging function (NOT A REAL TIME CHAT)
But I keep getting this error message I understand what it says or mean but I'm not sure why I am unable to establish this relationship
Please I need help to alternative if I can't do things this way
This is my profile(Engineer) models
class Engineer(AbstractUser):
username = models.CharField(max_length=200, null=True)
email = models.EmailField(unique=True, null=True)
bio = models.TextField()
avatar = models.ImageField(default="profile.png")
country = models.CharField(max_length=200)
years_of_experience = models.PositiveIntegerField(null=True, blank=True)
tech_stack = models.CharField(null=True, blank=True, max_length=300)
inbox = models.ForeignKey(Inbox, null=True, on_delete=models.CASCADE)
USERNAME_FIELD = "email"
REQUIRED_FIELDS = ["username"]
def __str__(self):
return self.username
and this is my Inbox models
class Inbox(models.Model):
sender = models.ForeignKey(Engineer, null=True, on_delete=models.CASCADE, related_name='mail_sender')
receiver = models.ForeignKey(Engineer, null=True, on_delete=models.CASCADE, related_name="mail_receiver")
message = models.CharField(max_length=500)
updated = models.DateTimeField(auto_now=True)
created = models.DateTimeField(auto_now_add=True)
class Meta:
ordering = ["-created"]
def __str__(self):
return self.sender.username
Just make the Engineer import as follows
sender = models.ForeignKey('Engineer', null=True, on_delete=models.CASCADE, related_name='mail_sender')
receiver = models.ForeignKey('Engineer', null=True, on_delete=models.CASCADE, related_name="mail_receiver")
I have this models and the view for user profile.
class Room(models.Model):
admin = models.ForeignKey(User, on_delete=models.SET_NULL, null=True)
topic = models.ForeignKey(Topic, on_delete=models.SET_NULL, null=True)
group_photo = models.ImageField(null=True, upload_to = 'images/', default='avatar.svg')
name = models.CharField(unique=True, max_length=100)
description = models.TextField(null=True, blank=True)
members = models.ManyToManyField(User, related_name='members', blank=True)
created = models.DateTimeField(auto_now_add=True)
views.py
#login_required(login_url= 'login')
def userprofile(request, pk):
user = User.objects.get(username=pk)
#groups = user.room_set.all()
groups = Room.objects.filter(admin=user)
all_groups = Room.objects.filter(members=user)
return render(request, 'base/profile.html', {'user':user, 'groups':groups, 'all_groups':all_groups})
Please explain how _set.all method filter method are doing the same job.
I don't understand where the room is coming from (there is only (Room) model.
explain the mechanism of user.room_set.all line respect to filter;
Hey there i have a Order table which has created_at field, as multiple objects will be created at same date i want to list the objects by date.Such as i want to group the objects by date .Thank you.
#model
class SalesOrder(models.Model):
invoice_id = models.CharField(max_length=50, blank=True, null=True)
code = models.CharField(max_length=50, blank=True, null=True)
amount = models.FloatField(default=0.0, null=True, blank=True)
branch = models.ForeignKey('shop.Branch', on_delete=models.SET_NULL, null=True, blank=True)
customer = models.CharField(max_length=50, null=True, blank=True)
customer_contact = models.CharField(max_length=50, null=True, blank=True)
created_at = models.DateTimeField(auto_now_add=True)
def __str__(self):
return str(self.code)
def get_context_data(self, **kwargs): #View
cxt = super().get_context_data()
cxt['dates'] = SaleOrder.objects.annotate(
count=Count('created_at__date'))
# import pdb;pdb.set_trace()
cxt['form'] = SalesOrderForm(self.request.POST or None)
Im Try to Catch any data from database with table name is 'UserUsulan'.
I have two field, 'Ketua' and 'Anggota'.
In Ketua Field is ForeignKey from User, and Anggota is ManyToMany Field with relationship from User.
I want to render the data.
if in Ketua Field equal current.user render the data.
and also if current.user in Anggota field i want it render too.
So,
If the current.user is not able in Ketua Field, but able in Anggota Field. Render the Data
If the current.user is not able in Anggota Field, buat able in Ketua Field. Render the Data Too.
How To Solve this problem.
Im read with this documentation Spanning multi-valued relationships . But the Queryset is empty[].
models.py
tahun = models.IntegerField(_('year'), choices=YEAR_CHOICES, default=datetime.datetime.now().year)
judul_penelitian = models.TextField(blank=True)
jenis_penelitian = models.CharField(max_length=16, blank=True, default="", choices=JENIS_PENELITIAN_CHOICE)
tmt_awal = models.DateField(null=True, blank=True)
tmt_akhir = models.DateField(null=True, blank=True)
bidang_penelitian = models.CharField(max_length=10, blank=True, default="", choices=BIDANG_PENELITIAN_CHOICE)
tujuan_sosial_ekonomi = models.TextField(blank=True)
sumber_dana = models.CharField(max_length=30, blank=True, default="", choices=SUMBER_DANA_CHOICE)
skema_penelitian = models.CharField(max_length=15, blank=True, default="", choices=SKEMA_PENELITIAN_CHOICE)
jumlah_dana_usulan = MoneyField(max_digits=14, decimal_places=2, default_currency='IDR')
target_luaran = models.CharField(max_length=23, blank=True, default="", choices=TARGET_LUARAN_CHOICE)
ketua = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='ketua_penelitian', on_delete=models.CASCADE, null=True, blank=True)
anggota = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name='anggota_penelitian')
upload_file = models.FileField(upload_to='Penelitian/', null=True, blank=True)
status_usulan = models.CharField(max_length=8, blank=True, choices=STATUS_USULAN_CHOICE, default='MENUNGGU')
jumlah_dana_disetujui = MoneyField(max_digits=14, decimal_places=2, default_currency='IDR', null=True, blank=True)
keterangan_operator = models.TextField(null=True, blank=True)
com_reviewer_1 = models.TextField(null=True, blank=True)
com_reviewer_2 = models.TextField(null=True, blank=True)
views.py
def get_queryset(self):
queryset = super(UserUsulanPenelitianCreateAndListView, self).get_queryset()
queryset = queryset.filter(ketua=self.request.user,).filter(anggota=self.request.user,)
print(queryset)
return queryset
I Found The Answer, Using Q for the queryset
Import Q
from django.db.models import Q
Using Q in Queryset
def get_queryset(self):
queryset = super(UserUsulanPenelitianCreateAndListView, self).get_queryset()
queryset = queryset.filter(Q(ketua=self.request.user)|Q(anggota=self.request.user)).distinct()
print(queryset)
return queryset