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;
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 would like to make a Ingredientslist for recipies(model named articles) and therefore need to assign unique values to Ingredients out of a Many to Many Infredient list.
I know that there is no straight forward way to implement a two dimensional array in django but I hope someone here has had this issue and knows a workaround.
Here I have my models being part of this issue:
class Ingredient(models.Model):
name = models.CharField(max_length=200, null=False)
kcal = models.IntegerField(validators=[MinValueValidator(0), MaxValueValidator(800)], blank=True, default=0)
carbs = models.IntegerField(validators=[MinValueValidator(0), MaxValueValidator(99)], blank=True, default=0)
protein = models.IntegerField(validators=[MinValueValidator(0), MaxValueValidator(99)], blank=True, default=0)
fat = models.IntegerField(validators=[MinValueValidator(0), MaxValueValidator(99)], blank=True, default=0)
class Article(models.Model):
banner = models.ImageField(null=True, default='dashboard-BG.jpg')
headline = models.CharField(max_length=200, null=False, default='Unnamed')
subtitle = models.CharField(max_length=300, null=False, default='Unnamed')
article_body = models.CharField(max_length=4000, null=False, default='Lorem Ipsum')
date_created = models.DateTimeField(auto_now_add=True)
ingredientList = models.BooleanField(null=True, default=False)
ingredients = models.ManyToManyField(Ingredient, blank=True)
kcal = models.IntegerField(validators=[MinValueValidator(0), MaxValueValidator(3000)], null=True, blank=True)
carbs = models.IntegerField(validators=[MinValueValidator(0), MaxValueValidator(3000)], null=True, blank=True)
protein = models.IntegerField(validators=[MinValueValidator(0), MaxValueValidator(3000)], null=True, blank=True)
fat = models.IntegerField(validators=[MinValueValidator(0), MaxValueValidator(3000)], null=True, blank=True)
def save(self, *args, **kwargs):
super().save(*args, **kwargs)
ingredients = self.ingredients
totalCalories = 0
totalCarbs = 0
totalProtein = 0
totalFat = 0
for i in ingredients:
totalCalories += i.kcal
totalCarbs += i.carbs
totalProtein += i.protein
totalFat += i.fat
if i == 0:
return
self.kcal = totalCalories
self.carbs = totalCarbs
self.protein = totalProtein
self.fat = totalFat
self.save()
def __str__(self):
return self.headline
The 'two dimensional array should be the ingredients model field. Many ingredients having a specific unique amount for this recipe.
Thx for all the answers in advance ;)
In Django, models are representations of fields in SQL datatables. You could look into the JSONField type. This Field will hold any form of JSON data, basically a python dictionary. You could have one key for the ingredient and one key for the amount. Hope this helps!
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
I am building an app in Django 1.9 with the models Customers and Addresses:
class Customers(models.Model):
name = models.CharField(db_column='NAME', max_length=400)
email = models.CharField(db_column='EMAIL', max_length=255, unique=True)
phone_number = models.CharField(db_column='PHONE_NUMBER', max_length=200, blank=True, null=True)
address = models.ForeignKey(Addresses, db_column='ADDRESS_ID', related_name='customer_address', null=True)
class Addresses(models.Model):
street = models.TextField(db_column='STREET', max_length=2000)
city = models.CharField(db_column='CITY', max_length=400, blank=True, null=True)
postal_code = models.CharField(db_column='POSTAL_CODE', max_length=200, blank=True, null=True)
country = models.ForeignKey(Country, db_column='COUNTRY_ID', null=True)
I am new in Django, so please forgive me if this has too much mistakes.
I want to create a new Customer using a form:
class CustomersForm(ModelForm):
name = forms.CharField(label=_(u'Name'), widget=TextInput())
email = forms.CharField(label=_(u'Email'), widget=TextInput())
phone_number = forms.IntegerField(label=_(u'Phone Number'), required=False, widget=TextInput(attrs={'style': 'width:80px'}))
But I still want to be able to add the address. I read some stuff about nested forms, but I didn't understand.
Could you, please, help in building a form that creates a Customer with name, email, phone_number and address?
I figured it out! :)
You have to override the save method of the form.
class CustomersForm(ModelForm):
name = forms.CharField(label=_(u'Name'), widget=TextInput())
email = forms.CharField(label=_(u'Email'), widget=TextInput())
a_street = forms.CharField(label=_(u'Street'), widget=TextInput(), required=False)
a_postal_code = forms.CharField(label=_(u'Postal Code'), widget=TextInput(), required=False)
a_city = forms.CharField(label=_(u'City'), widget=TextInput(), required=False)
a_country = forms.CharField(label=_(u'Country'), widget=TextInput(), required=False)
# Override the save method like this
def save(self, commit=True):
c = super(CustomersForm, self).save(commit=False)
# Address
if c.address:
a = c.address
else:
a = Addresses()
a.street = self.cleaned_data.get('a_street')
a.city = self.cleaned_data.get('a_city')
a.postal_code = self.cleaned_data.get('a_postal_code')
a.country = self.cleaned_data.get('a_country')
if commit:
a.save()
c.address = a
c.save()
return c