Get Objects Not Transacted for Last 3 Months
1
I'm fairly new to Django. I have two objects in a django project: Transaction and Item. Item can have many Transaction objects. Transaction has date_time and item fields. How can I write a django query to fetch Items that haven't had any transactions in the past 20 days?
class Item(models.Model):
name = models.CharField(max_length=80)
class Transaction(models.Model):
date_time = models.DateTimeField(default=timezone.now)
item = models.ForeignKey(Item)
Thanks in advance.
python django
asked Nov 13 '18 at 8:51
TeddyTeddy
83
add a comment |
1
I'm fairly new to Django. I have two objects in a django project: Transaction and Item. Item can have many Transaction objects. Transaction has date_time and item fields. How can I write a django query to fetch Items that haven't had any transactions in the past 20 days?
class Item(models.Model):
name = models.CharField(max_length=80)
class Transaction(models.Model):
date_time = models.DateTimeField(default=timezone.now)
item = models.ForeignKey(Item)
Thanks in advance.
python django
asked Nov 13 '18 at 8:51
TeddyTeddy
83
Show your model and view codes.
– MD. Khairul Basar
Nov 13 '18 at 9:20
Hi Basar, I have shown the models
– Teddy
Nov 13 '18 at 10:09
add a comment |
1
1
1
I'm fairly new to Django. I have two objects in a django project: Transaction and Item. Item can have many Transaction objects. Transaction has date_time and item fields. How can I write a django query to fetch Items that haven't had any transactions in the past 20 days?
class Item(models.Model):
name = models.CharField(max_length=80)
class Transaction(models.Model):
date_time = models.DateTimeField(default=timezone.now)
item = models.ForeignKey(Item)
Thanks in advance.
python django
asked Nov 13 '18 at 8:51
TeddyTeddy
83
I'm fairly new to Django. I have two objects in a django project: Transaction and Item. Item can have many Transaction objects. Transaction has date_time and item fields. How can I write a django query to fetch Items that haven't had any transactions in the past 20 days?
class Item(models.Model):
name = models.CharField(max_length=80)
class Transaction(models.Model):
date_time = models.DateTimeField(default=timezone.now)
item = models.ForeignKey(Item)
Thanks in advance.
python django
python django
asked Nov 13 '18 at 8:51
TeddyTeddy
83
asked Nov 13 '18 at 8:51
TeddyTeddy
83
edited Nov 13 '18 at 10:08
Teddy
asked Nov 13 '18 at 8:51
TeddyTeddy
83
asked Nov 13 '18 at 8:51
TeddyTeddy
83
asked Nov 13 '18 at 8:51
TeddyTeddy
83
83
Show your model and view codes.
– MD. Khairul Basar
Nov 13 '18 at 9:20
Hi Basar, I have shown the models
– Teddy
Nov 13 '18 at 10:09
add a comment |
Show your model and view codes.
– MD. Khairul Basar
Nov 13 '18 at 9:20
Hi Basar, I have shown the models
– Teddy
Nov 13 '18 at 10:09
Show your model and view codes.
– MD. Khairul Basar
Nov 13 '18 at 9:20
Show your model and view codes.
– MD. Khairul Basar
Nov 13 '18 at 9:20
Hi Basar, I have shown the models
– Teddy
Nov 13 '18 at 10:09
Hi Basar, I have shown the models
– Teddy
Nov 13 '18 at 10:09
add a comment |
1 Answer
1
active
oldest
votes
2
Assuming your models are:
class Item(models.Model):
name = models.CharField(max_length=100)
class Transaction(models.Model):
item = models.ForeignKey(Item, on_delete=models.CASCADE)
created_at = models.DateTimeField()
You can do a query like:
from datetime import datetime, timedelta
Item.objects.distinct().exclude(transaction__created_at__gte=datetime.now() - timedelta(days=20))
This query will find items with transactions in past 20 days, then show rest of the items (which dont have any transaction in past 20 days).
Try this on Django Shell. To open shell: python manage.py shell
answered Nov 13 '18 at 9:27
jerrymousejerrymouse
8,490104867
What version of Django are you using?import djangodjango.VERSIONshould give you version.
– jerrymouse
Nov 13 '18 at 10:49
@Teddy can you please copy and paste the exact command that gave you this error?
– jerrymouse
Nov 13 '18 at 10:52
There's no field namedtransactioninItemmodel.
– MD. Khairul Basar
Nov 13 '18 at 10:55
1
@MD.KhairulBasar From docs.djangoproject.com/en/2.1/topics/db/queries/…It works backwards, too. To refer to a “reverse” relationship, just use the lowercase name of the model.
– jerrymouse
Nov 13 '18 at 11:02
@jerrymouse if there has been a transaction both before and after 20 days, the Item will still show up but all I need is only the Items that haven't had any transaction in the last 20 days
– Teddy
Nov 13 '18 at 11:42
|
show 2 more comments
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1 Answer
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active
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votes
1 Answer
1
active
oldest
votes
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oldest
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oldest
votes
2
Assuming your models are:
class Item(models.Model):
name = models.CharField(max_length=100)
class Transaction(models.Model):
item = models.ForeignKey(Item, on_delete=models.CASCADE)
created_at = models.DateTimeField()
You can do a query like:
from datetime import datetime, timedelta
Item.objects.distinct().exclude(transaction__created_at__gte=datetime.now() - timedelta(days=20))
This query will find items with transactions in past 20 days, then show rest of the items (which dont have any transaction in past 20 days).
Try this on Django Shell. To open shell: python manage.py shell
answered Nov 13 '18 at 9:27
jerrymousejerrymouse
8,490104867
What version of Django are you using?import djangodjango.VERSIONshould give you version.
– jerrymouse
Nov 13 '18 at 10:49
@Teddy can you please copy and paste the exact command that gave you this error?
– jerrymouse
Nov 13 '18 at 10:52
There's no field namedtransactioninItemmodel.
– MD. Khairul Basar
Nov 13 '18 at 10:55
1
@MD.KhairulBasar From docs.djangoproject.com/en/2.1/topics/db/queries/…It works backwards, too. To refer to a “reverse” relationship, just use the lowercase name of the model.
– jerrymouse
Nov 13 '18 at 11:02
@jerrymouse if there has been a transaction both before and after 20 days, the Item will still show up but all I need is only the Items that haven't had any transaction in the last 20 days
– Teddy
Nov 13 '18 at 11:42
|
show 2 more comments
2
Assuming your models are:
class Item(models.Model):
name = models.CharField(max_length=100)
class Transaction(models.Model):
item = models.ForeignKey(Item, on_delete=models.CASCADE)
created_at = models.DateTimeField()
You can do a query like:
from datetime import datetime, timedelta
Item.objects.distinct().exclude(transaction__created_at__gte=datetime.now() - timedelta(days=20))
This query will find items with transactions in past 20 days, then show rest of the items (which dont have any transaction in past 20 days).
Try this on Django Shell. To open shell: python manage.py shell
answered Nov 13 '18 at 9:27
jerrymousejerrymouse
8,490104867
What version of Django are you using?import djangodjango.VERSIONshould give you version.
– jerrymouse
Nov 13 '18 at 10:49
@Teddy can you please copy and paste the exact command that gave you this error?
– jerrymouse
Nov 13 '18 at 10:52
There's no field namedtransactioninItemmodel.
– MD. Khairul Basar
Nov 13 '18 at 10:55
1
@MD.KhairulBasar From docs.djangoproject.com/en/2.1/topics/db/queries/…It works backwards, too. To refer to a “reverse” relationship, just use the lowercase name of the model.
– jerrymouse
Nov 13 '18 at 11:02
@jerrymouse if there has been a transaction both before and after 20 days, the Item will still show up but all I need is only the Items that haven't had any transaction in the last 20 days
– Teddy
Nov 13 '18 at 11:42
|
show 2 more comments
2
2
2
Assuming your models are:
class Item(models.Model):
name = models.CharField(max_length=100)
class Transaction(models.Model):
item = models.ForeignKey(Item, on_delete=models.CASCADE)
created_at = models.DateTimeField()
You can do a query like:
from datetime import datetime, timedelta
Item.objects.distinct().exclude(transaction__created_at__gte=datetime.now() - timedelta(days=20))
This query will find items with transactions in past 20 days, then show rest of the items (which dont have any transaction in past 20 days).
Try this on Django Shell. To open shell: python manage.py shell
answered Nov 13 '18 at 9:27
jerrymousejerrymouse
8,490104867
Assuming your models are:
class Item(models.Model):
name = models.CharField(max_length=100)
class Transaction(models.Model):
item = models.ForeignKey(Item, on_delete=models.CASCADE)
created_at = models.DateTimeField()
You can do a query like:
from datetime import datetime, timedelta
Item.objects.distinct().exclude(transaction__created_at__gte=datetime.now() - timedelta(days=20))
This query will find items with transactions in past 20 days, then show rest of the items (which dont have any transaction in past 20 days).
Try this on Django Shell. To open shell: python manage.py shell
answered Nov 13 '18 at 9:27
jerrymousejerrymouse
8,490104867
edited Nov 13 '18 at 18:02
answered Nov 13 '18 at 9:27
jerrymousejerrymouse
8,490104867
answered Nov 13 '18 at 9:27
jerrymousejerrymouse
8,490104867
answered Nov 13 '18 at 9:27
jerrymousejerrymouse
8,490104867
8,490104867
What version of Django are you using?import djangodjango.VERSIONshould give you version.
– jerrymouse
Nov 13 '18 at 10:49
@Teddy can you please copy and paste the exact command that gave you this error?
– jerrymouse
Nov 13 '18 at 10:52
There's no field namedtransactioninItemmodel.
– MD. Khairul Basar
Nov 13 '18 at 10:55
1
@MD.KhairulBasar From docs.djangoproject.com/en/2.1/topics/db/queries/…It works backwards, too. To refer to a “reverse” relationship, just use the lowercase name of the model.
– jerrymouse
Nov 13 '18 at 11:02
@jerrymouse if there has been a transaction both before and after 20 days, the Item will still show up but all I need is only the Items that haven't had any transaction in the last 20 days
– Teddy
Nov 13 '18 at 11:42
|
show 2 more comments
What version of Django are you using?import djangodjango.VERSIONshould give you version.
– jerrymouse
Nov 13 '18 at 10:49
@Teddy can you please copy and paste the exact command that gave you this error?
– jerrymouse
Nov 13 '18 at 10:52
There's no field namedtransactioninItemmodel.
– MD. Khairul Basar
Nov 13 '18 at 10:55
1
@MD.KhairulBasar From docs.djangoproject.com/en/2.1/topics/db/queries/…It works backwards, too. To refer to a “reverse” relationship, just use the lowercase name of the model.
– jerrymouse
Nov 13 '18 at 11:02
@jerrymouse if there has been a transaction both before and after 20 days, the Item will still show up but all I need is only the Items that haven't had any transaction in the last 20 days
– Teddy
Nov 13 '18 at 11:42
What version of Django are you using?
import django django.VERSION should give you version.– jerrymouse
Nov 13 '18 at 10:49
What version of Django are you using?
import django django.VERSION should give you version.– jerrymouse
Nov 13 '18 at 10:49
@Teddy can you please copy and paste the exact command that gave you this error?
– jerrymouse
Nov 13 '18 at 10:52
@Teddy can you please copy and paste the exact command that gave you this error?
– jerrymouse
Nov 13 '18 at 10:52
There's no field named
transaction in Item model.– MD. Khairul Basar
Nov 13 '18 at 10:55
There's no field named
transaction in Item model.– MD. Khairul Basar
Nov 13 '18 at 10:55
1
1
@MD.KhairulBasar From docs.djangoproject.com/en/2.1/topics/db/queries/…
It works backwards, too. To refer to a “reverse” relationship, just use the lowercase name of the model.– jerrymouse
Nov 13 '18 at 11:02
@MD.KhairulBasar From docs.djangoproject.com/en/2.1/topics/db/queries/…
It works backwards, too. To refer to a “reverse” relationship, just use the lowercase name of the model.– jerrymouse
Nov 13 '18 at 11:02
@jerrymouse if there has been a transaction both before and after 20 days, the Item will still show up but all I need is only the Items that haven't had any transaction in the last 20 days
– Teddy
Nov 13 '18 at 11:42
@jerrymouse if there has been a transaction both before and after 20 days, the Item will still show up but all I need is only the Items that haven't had any transaction in the last 20 days
– Teddy
Nov 13 '18 at 11:42
|
show 2 more comments
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Show your model and view codes.
– MD. Khairul Basar
Nov 13 '18 at 9:20
Hi Basar, I have shown the models
– Teddy
Nov 13 '18 at 10:09