hi I am trying to get the same value in a many to many tables but I don't know how can I achieve that
here is my model:
class Raza(models.Model):
Nombre = models.CharField(max_length=50)
Origen = models.CharField(max_length=45)
Altura = models.CharField(max_length=10)
Peso = models.CharField(max_length=10)
Esperanza_vida = models.CharField(max_length=10)
Actividad_fisica = models.CharField(max_length=45)
Recomendaciones = models.CharField(max_length=500)
Clasificacion_FCI = models.ForeignKey(Clasificacion_FCI,null=True,blank=True,on_delete=models.CASCADE)
Tipo_pelo = models.ManyToManyField(Tipo_pelo,blank=True)
Caracteristicas_fisicas = models.ManyToManyField(Caracteristicas_fisicas,blank=True)
Caracter = models.ManyToManyField(Caracter,blank=True)
Ideal = models.ManyToManyField(Ideal,blank=True)
Tamanio = models.ForeignKey(Tamanio,null=True,blank=True,on_delete=models.CASCADE)
User = models.ManyToManyField(User,blank=True)
I am using the User model that's provided by Django
I have no idea how can I do that
I want do something like that
table user
id_usuario = 1
name = "Juan"
table raza
id_raza = 1
name = "pitbull"
table user_raza
id_user_raza = 1
id_user = 1
id_raza = 1
Please write class attributes with small letters in python.
to your question:
raza = Raza.objects.get(id=1)
tipo_pelos = raza.tipo_pelo.all()
for tp in tipo_pelos:
print(tp.id)
...
...
Django has wonderful documentation for this. Have fun.
Related
Please need help with the following
I am trying to update database in comparison to previous uploaded csv file. I need to update all fields except the vin if it changes (vin is the unique value), delete the item if it is no longer in the csv file and create one if one is new
vin. stock_no make model trim miles
12345789098765432 4535 honda civic lx 89000
j4j4jj49098765432 3453 toyota corolla DX 54555
12345345438765432 6254 ford mustang es 101299
When I change any value and the csv is uploaded it makes a duplicate:
def upload_file__view(request):
form = form(request.POST or None, request.FILES or
None)
company = Comp_info.objects.last()
if form.is_valid():
form.save()
obj = c.objects.get(activated=False)
with open(obj.file_name.path, 'r+') as f:
reader = c.reader(f)
for i, row in enumerate(reader):
if i==0:
pass
else:
# row = "".join(row)
# row = row.replace(",", " ")
# row = row.split()
print(row)
print(type(row))
vin = row[0].upper()
condition = row[1].replace("U", "Used").replace("N", "New")
stock_no = row[2]
year = int(row[5])
make = row[3]
model = row[4]
trim = row[6]
mileage = row[8]
mpg_city = row[18]
mpg_hwy = row[19]
engine = row[9]
transmission = row[12]
fuel_type = row[11]
vehicle_type = row[7]
drive_type = row[20].replace("4X2", "2WD").replace("4X4", "4WD")
exterior_color = row[15]
interior_color = row[16]
price = row[13].replace("0", "")
description = row[22]
features_2 = row[21]
images_data = row[23]
raw_images_list = images_data.split(',')
images_list = [""] * 25
for x in range(image_count):
if x == 25:
break
images_list[x] = raw_images_list[x]
for x in images_list:
print(x)
if images_list[0] == "":
images_list[0] = "https://www.beverlyhillscarclub.com/template/images/ina_f.jpg"
car_photo = images_list[0]
car_photo_1 = images_list[1]
car_photo_2 = images_list[2]
car_photo_3 = images_list[3]
car_photo_4 = images_list[4]
car_photo_5 = images_list[5]
car_photo_6 = images_list[6]
car_photo_7 = images_list[7]
car_photo_8 = images_list[8]
car_photo_9 = images_list[9]
car_photo_10 = images_list[10]
car_photo_11 = images_list[11]
car_photo_12 = images_list[12]
car_photo_13 = images_list[13]
car_photo_14 = images_list[14]
car_photo_15 = images_list[15]
car_photo_16 = images_list[16]
car_photo_17 = images_list[17]
car_photo_18 = images_list[18]
car_photo_19 = images_list[19]
car_photo_20 = images_list[20]
car_photo_21 = images_list[21]
car_photo_22 = images_list[22]
car_photo_23 = images_list[23]
car_photo_24 = images_list[24]
# notes = pip._vendor.requests(images_list[0], stream=True)
#car_photo = row[23]
# user = User.objects.get(username=row[3])
Cars.objects.update_or_create(
vin = vin,
condition = condition,
stock_no = stock_no,
year = year,
make = make,
model = model,
trim = trim,
mileage = mileage,
mpg_city = mpg_city,
engine = engine,
transmission = transmission,
fuel_type = fuel_type,
vehicle_type = vehicle_type,
drive_type = drive_type,
exterior_color = exterior_color,
interior_color = interior_color,
price = price,
description = description,
company_name = company.company_name,
address = company.company_address,
city = company.city,
state = company.state,
zip = company.zip_code,
phone_number = company.phone_number,
email = company.fax_number,
features_2 = features_2,
car_photo = downloadFile(car_photo),
car_photo_1 = downloadFile(car_photo_1),
car_photo_2 = downloadFile(car_photo_2),
car_photo_3 = downloadFile(car_photo_3),
car_photo_4 = downloadFile(car_photo_4),
car_photo_5 = downloadFile(car_photo_5),
car_photo_6 = downloadFile(car_photo_6),
car_photo_7 = downloadFile(car_photo_7),
car_photo_8 = downloadFile(car_photo_8),
car_photo_9 = downloadFile(car_photo_9),
car_photo_10 = downloadFile(car_photo_10),
car_photo_11 = downloadFile(car_photo_11),
car_photo_12 = downloadFile(car_photo_12),
car_photo_13 = downloadFile(car_photo_13),
car_photo_14 = downloadFile(car_photo_14),
car_photo_15 = downloadFile(car_photo_15),
car_photo_16 = downloadFile(car_photo_16),
car_photo_17 = downloadFile(car_photo_17),
car_photo_18 = downloadFile(car_photo_18),
car_photo_19 = downloadFile(car_photo_19),
car_photo_20 = downloadFile(car_photo_20),
car_photo_21 = downloadFile(car_photo_21),
car_photo_22 = downloadFile(car_photo_22),
car_photo_23 = downloadFile(car_photo_23),
car_photo_24 = downloadFile(car_photo_24)
#car_photo = car_photo,
# quantity = int(row[2]),
# salesman = user
)
obj.activated = True
obj.save()
data = {
'form' : form,
'now' : now,
}
return render(request, 'uploads.html', data)
Thanks in advance for any help!
Thank you
Step 1
An empty list was created to compare with uploaded data:
imported_cars = []
Step 2
Created a filter of unique value (primary Key) and checked if it existed and used the method get to update items. Created car (item variable) to update or create ubject.
if Cars.objects.filter(vin=vin).exists():
car = Cars.objects.get(vin=vin)
Step 3
Used else statement to create item if it did not exist.
else:
car = Cars.objects.create(vin=vin, condition=condition...)
Last, out of the loop populated empty list with updated and created cars and deleted items that were in the database but not in the csv file.
imported_cars_vin_numbers = [car.vin for car in imported_cars]
for car in Cars.objects.all():
if car.vin not in imported_cars_vin_numbers:
car.delete()
Special thanks and credit to Zack Plauché who was extremely helpful and professional in helping me and teaching me how to solve this issue.
Your issue is in the model.py
you should write the Cars object with the following.
vin = models.CharField(primary_key=True, editable=False)
Confirm this works, since I am suggesting solution without actually seeing the model.py
This should handle the update aspect of your logic. The part where you delete a vin if its not in the CSV will have to be done with new process I don't see written here.But a suggestion would be to clear the DB and repopulate, or create function that compares DB with CSV and delete object if not in CSV.
i found some problem when i try to update multiple object in my models. here is my models:
class NumberSequence(models.Model):
code = models.CharField(max_length=12)
name = models.CharField(max_length=60)
prefix = models.CharField(max_length=3)
length = models.IntegerField()
last = models.IntegerField(verbose_name='Last Number Used')
def getNumberSequence():
ns = NumberSequence.objects.filter(code='REQ')
letter = ns[0].prefix
lastNumber = ns[0].last+1
l = '{0}-{1:0'+str(ns[0].length)+'d}'
for num in ns:
num.last = lastNumber
num.save()
return l.format(letter,lastNumber+1)
class Requisitions(models.Model):
number = models.CharField(max_length=20, default=getNumberSequence())
transDate = models.DateField(verbose_name='Date')
businessUnit = models.ForeignKey(BusinessUnit, verbose_name='Unit')
division = models.ForeignKey(Division, verbose_name='Division')
remarks = models.TextField
status = models.IntegerField(verbose_name='Status')
when i create new record in Requisition, the table Number Sequence does not update. but if i restart the service, the number sequence table updated automatically.
what's happened with my code?
any suggestion, please..
You should not call the default function in your field definition, but pass the callable only without parentheses.
number = models.CharField(max_length=20, default=getNumberSequence)
I want to update a record, but the field is determined by string. Is it possible to do so?
This is my model:
class Wallet(models.Model):
user_id = models.IntegerField(blank=True, null=True)
wallet1 = models.DecimalField(max_digits=15, decimal_places=2, blank=True, null=True)
wallet2 = models.DecimalField(max_digits=15, decimal_places=2, blank=True, null=True)
This is my code:
amount = 200
transfer_from = 'wallet1'
transfer_to = 'wallet2'
obj = Wallet.objects.get(user_id=1)
obj.transfer_from = obj.transfer_from - amount
obj.transfer_to = obj.transfer_to + amount
obj.save()
Django only recognize the field when i write this:
obj.wallet1 = obj.wallet1 - amount
but it doesn't recognize this:
transfer_from = 'wallet1'
obj.transfer_from = obj.transfer_from - amount
Is said 'Wallet' object has no attribute 'transfer_from'. Thank you.
This is not tested but should work.
amount = 200
transfer_from = 'wallet1'
transfer_to = 'wallet2'
obj = Wallet.objects.get(user_id=1)
transfer_from_field_val = getattr(obj,transfer_from)
transfer_to_field_val = getattr(obj,transfer_to)
transfer_from_field_val = transfer_from_field_val - amount
transfer_to_field_val = transfer_to_field_val + amount
setattr(obj , transfer_from, transfer_from_field_val)
setattr(obj , transfer_to, transfer_to_field_val)
obj.save()
Actually this is a Python question.
Please refer to this: What is getattr() exactly and how do I use it?
Using getattr, here is what you could do:
transfer_from_label = 'wallet1'
transfer_from = getattr(obj, transfer_from_label)
transfer_from = transfer_from - amount
setattr(obj, transfer_form, getattr(obj, transfer_form) - amount)
getattr, setattr.
I'm trying to create an advanced search on my website, you are looking at various models related to each one, always returning a list of profiles that meet some parameters
Here are my Models:
class Profile(models.Model):
first_name=models.CharField(max_length=60, blank=False)
last_name=models.CharField(max_length=60, blank=False)
residence=models.CharField(max_length=60, null=True, blank=True)
birthdate=models.DateField(null=True, blank=True)
telephone=models.CharField(max_length=60, null=True, blank=True)
email=models.EmailField(null=True, blank=True)
linkedin=models.URLField(null=True, blank=True)
starred=models.BooleanField(default=False)
created_from = models.ForeignKey(EmployeeUser, related_name='profile_author')
created_on = models.DateField(default=tznow)
internal_id = models.CharField(max_length=5, blank=True)
class Education(models.Model):
almalaurea_id = models.CharField(max_length=60, null=True, blank=True)
profile = models.ForeignKey(Profile, related_name='education_profile')
education_type = models.ForeignKey(Education_type, related_name='education_type')
class Education_type(models.Model):
VALUES = (
(0, 'Altro'),
(1, 'Licenza media'),
(2, 'Diploma'),
(3, 'Laurea Triennale'),
(4, 'Laurea Magistrale'),
)
title = models.CharField(max_length=60)
value = models.IntegerField(choices=VALUES)
I want to search the profiles that meet various results, such as birthdate, residence, starred, education (based on education_type)
This is an example scenario, my research includes other models
These are the research in my view, I thought that having found the results of the two queries, I could extract the profile id and compare them, then run another query by selecting profiles that match, but I think it's not a great idea, the real scenario includes other various models.
filters_profile = []
filters_education = []
year = form.cleaned_data["year"]
residence = form.cleaned_data["residence"]
starred = form.cleaned_data["starred"]
education_type = form.cleaned_data["education_type"]
if year:
filters_profile.append(Q(birthdate__year=year))
if residence:
filters_profile.append(Q(residence__icontains=residence))
if starred:
filters_profile.append(Q(starred=starred))
result_profile = Profile.objects.filter(reduce(lambda q1, q2: q1 & q2, filters_profile)).order_by('first_name')
result_education = None
if education_type:
e = Education_type.objects.filter(title=education_type)
result_education = Education.objects.filter(education_type=e).prefetch_related('profile','education_type')
Any idea?
Many thanks in advance :)
EDIT :
About the solution of #Geo Jacob
Here is the third models:
if valutation:
result_valutation = Status.objects.filter(valutation=valutation).values_list('profile_id', flat=True)
key['id__in'] = result_valutation
Adding this code for my scenario, this solution don't work, as i written in the comments :)
"in practice, the content of key['id__in'] is overwritten when the other model query (this) is executed"
Try this:
key = {}
year = form.cleaned_data["year"]
residence = form.cleaned_data["residence"]
starred = form.cleaned_data["starred"]
education_type = form.cleaned_data["education_type"]
if year:
key['birthdate__year'] = year
if residence:
key['residence__icontains'] = residence
if starred:
key['starred'] = starred
if education_type:
e = Education_type.objects.filter(title=education_type)
result_education = Education.objects.filter(education_type=e).values_list('profile_id', flat=True)
key['id__in'] = result_education
result_profile = Profile.objects.filter(**key).order_by('first_name')
My solution working on more than 2 models, based on #Geo Jacob solution, thank you
I make a check and put in key['id__in'] only matched id from the previous query, so as to intersect the results
key = {}
statokey = 0
year = form.cleaned_data["year"]
residence = form.cleaned_data["residence"]
starred = form.cleaned_data["starred"]
education_type = form.cleaned_data["education_type"]
valutation = form.cleaned_data["valutation"]
if year:
key['birthdate__year'] = year
if residence:
key['residence__icontains'] = residence
if starred:
key['starred'] = starred
if education_type:
e = Education_type.objects.filter(title=education_type)
result_education = Education.objects.filter(education_type=e).values_list('profile_id', flat=True)
if statokey > 0:
for r in result_education:
for k in key['id__in']:
if r == k:
key['id__in'] = str(r)
else:
key['id__in'] = result_education
statokey += 1
if valutation:
result_valutation = Status.objects.filter(valutation=valutation).values_list('profile_id', flat=True)
if statokey > 0:
for r in result_valutation:
for k in key['id__in']:
if r == k:
key['id__in'] = str(r)
else:
key['id__in'] = result_valutation
statokey += 1
result_profile = Profile.objects.filter(**key).order_by('first_name')
I have 3 models in django:
class Movie(models.Model):
mid = models.IntegerField(primary_key = True)
name = models.CharField(max_length = 100)
class User(models.Model):
username = models.CharField(max_length=128, null=True)
uid = models.CharField(max_length=100)
movie = models.ManyToManyField(Movie, through = "Vote")
class Vote(models.Model):
movie = models.ForeignKey(Movie)
user = models.ForeignKey(User)
rating = models.IntegerField()
here rating = 0/1, 0 means dislike, 1 means like
i want to make some queries using filters:
find out all movies that a current user likes. For that i use this following 2 queries, but none of them work. In both cases it gives erroneous results
ans = Movie.objects.filter(vote__user = self).filter(vote__rating = 1)
ans = Movie.objects.filter(user__uid = self.uid).filter(vote__rating = 1)
I have a list of users in an array ids. I want to find out how many users from this list like a particular movie?
i tried this, but this is also incorrect:
ret = User.objects.filter(uid__in = ids).filter(vote__movie = mov).filter(vote__rating = 1)
can somebody please help me with these 2 queries?
I'd also suggest letting django assign the model's id's but if you are using a legacy database or for some other reason need to assign the id's you can query like so:
# uid is some uid
user = User.objects.get(uid=uid)
likes = Movie.objects.filter(vote__user=user, vote__rating=1)
or
likes = Movie.objects.filter(vote__user__uid=some_uid, vote__rating=1)
count of people in the list of users who like a specific movie:
>>> uids = ['1','2','3']
>>> # if mov is a Movie instance
>>> votes = Vote.objects.filter(user__uid__in=uids, movie=mov, rating=1)
>>> print votes.query
SELECT "so1_vote"."id", "so1_vote"."movie_id", "so1_vote"."user_id", "so1_vote"."rating" FROM "so1_vote" INNER JOIN "so1_user" ON ("so1_vote"."user_id" = "so1_user"."id") WHERE ("so1_user"."uid" IN (1, 2, 3) AND "so1_vote"."movie_id" = 1 AND "so1_vote"."rating" = 1 )
>>> # if mov is a mid for a movie
>>> # get movie instance by using Movie.objects.get(mid=mov)
>>> # or query:
>>> # votes = Vote.objects.filter(user__uid__in=uids, movie__mid=mov, rating=1)
>>> likes_count = votes.count()
>>> print likes_count
0
combined:
likes_count = Votes.objects.filter(user__uid__in=uids, movie=mov, rating=1).count()