How to write joins in orm
0
class Test(models.Model):
name = models.CharField(max_length=50)
class TestDetails(models.Model):
user = models.ForeignKey(User,on_delete = models.CASCADE)
test = models.ForeignKey(Test,on_delete = models.CASCADE)
mark = models.IntegerField(default=0)
I create a TestDetails when a user signs up for a test. I need to get the list of tests that the user has not signed up.
django django-models
asked Nov 14 '18 at 4:17
Garry KevinGarry Kevin
114
add a comment |
0
class Test(models.Model):
name = models.CharField(max_length=50)
class TestDetails(models.Model):
user = models.ForeignKey(User,on_delete = models.CASCADE)
test = models.ForeignKey(Test,on_delete = models.CASCADE)
mark = models.IntegerField(default=0)
I create a TestDetails when a user signs up for a test. I need to get the list of tests that the user has not signed up.
django django-models
asked Nov 14 '18 at 4:17
Garry KevinGarry Kevin
114
1
TryTest.objects.exclude(testdetails__user=my_user)
– Selcuk
Nov 14 '18 at 4:30
1
@Selcuk Doesn't that assume arelated_namethat doesn't appear to be set onTestDetails.test? I think the default would betest_details_setin this case.
– kungphu
Nov 14 '18 at 4:34
1
@kungphu No,_setconvention generates a convenience property to access all child objects. In a query you should be using the actual model name. See docs.djangoproject.com/en/2.1/topics/db/examples/many_to_one for more examples; for exampleReporter.objects.filter(article__headline__startswith='This'). Note that it isarticle__headlineand notarticle__set__headline.
– Selcuk
Nov 14 '18 at 5:13
Well that's interesting. I can't say I like the fact that it usestestdetailsinstead oftest_details; seems a little counter to the way names are usually treated in Python and Django.
– kungphu
Nov 14 '18 at 6:59
@kungphu Agreed, it is a bit inconsistent but I guess the reason was to reduce the number of underscores in a long traversal, or it's just¯_(ツ)_/¯.
– Selcuk
Nov 15 '18 at 3:34
add a comment |
0
0
0
class Test(models.Model):
name = models.CharField(max_length=50)
class TestDetails(models.Model):
user = models.ForeignKey(User,on_delete = models.CASCADE)
test = models.ForeignKey(Test,on_delete = models.CASCADE)
mark = models.IntegerField(default=0)
I create a TestDetails when a user signs up for a test. I need to get the list of tests that the user has not signed up.
django django-models
asked Nov 14 '18 at 4:17
Garry KevinGarry Kevin
114
class Test(models.Model):
name = models.CharField(max_length=50)
class TestDetails(models.Model):
user = models.ForeignKey(User,on_delete = models.CASCADE)
test = models.ForeignKey(Test,on_delete = models.CASCADE)
mark = models.IntegerField(default=0)
I create a TestDetails when a user signs up for a test. I need to get the list of tests that the user has not signed up.
django django-models
django django-models
asked Nov 14 '18 at 4:17
Garry KevinGarry Kevin
114
asked Nov 14 '18 at 4:17
Garry KevinGarry Kevin
114
asked Nov 14 '18 at 4:17
Garry KevinGarry Kevin
114
asked Nov 14 '18 at 4:17
Garry KevinGarry Kevin
114
asked Nov 14 '18 at 4:17
Garry KevinGarry Kevin
114
114
1
TryTest.objects.exclude(testdetails__user=my_user)
– Selcuk
Nov 14 '18 at 4:30
1
@Selcuk Doesn't that assume arelated_namethat doesn't appear to be set onTestDetails.test? I think the default would betest_details_setin this case.
– kungphu
Nov 14 '18 at 4:34
1
@kungphu No,_setconvention generates a convenience property to access all child objects. In a query you should be using the actual model name. See docs.djangoproject.com/en/2.1/topics/db/examples/many_to_one for more examples; for exampleReporter.objects.filter(article__headline__startswith='This'). Note that it isarticle__headlineand notarticle__set__headline.
– Selcuk
Nov 14 '18 at 5:13
Well that's interesting. I can't say I like the fact that it usestestdetailsinstead oftest_details; seems a little counter to the way names are usually treated in Python and Django.
– kungphu
Nov 14 '18 at 6:59
@kungphu Agreed, it is a bit inconsistent but I guess the reason was to reduce the number of underscores in a long traversal, or it's just¯_(ツ)_/¯.
– Selcuk
Nov 15 '18 at 3:34
add a comment |
1
TryTest.objects.exclude(testdetails__user=my_user)
– Selcuk
Nov 14 '18 at 4:30
1
@Selcuk Doesn't that assume arelated_namethat doesn't appear to be set onTestDetails.test? I think the default would betest_details_setin this case.
– kungphu
Nov 14 '18 at 4:34
1
@kungphu No,_setconvention generates a convenience property to access all child objects. In a query you should be using the actual model name. See docs.djangoproject.com/en/2.1/topics/db/examples/many_to_one for more examples; for exampleReporter.objects.filter(article__headline__startswith='This'). Note that it isarticle__headlineand notarticle__set__headline.
– Selcuk
Nov 14 '18 at 5:13
Well that's interesting. I can't say I like the fact that it usestestdetailsinstead oftest_details; seems a little counter to the way names are usually treated in Python and Django.
– kungphu
Nov 14 '18 at 6:59
@kungphu Agreed, it is a bit inconsistent but I guess the reason was to reduce the number of underscores in a long traversal, or it's just¯_(ツ)_/¯.
– Selcuk
Nov 15 '18 at 3:34
1
1
Try
Test.objects.exclude(testdetails__user=my_user)– Selcuk
Nov 14 '18 at 4:30
Try
Test.objects.exclude(testdetails__user=my_user)– Selcuk
Nov 14 '18 at 4:30
1
1
@Selcuk Doesn't that assume a
related_name that doesn't appear to be set on TestDetails.test? I think the default would be test_details_set in this case.– kungphu
Nov 14 '18 at 4:34
@Selcuk Doesn't that assume a
related_name that doesn't appear to be set on TestDetails.test? I think the default would be test_details_set in this case.– kungphu
Nov 14 '18 at 4:34
1
1
@kungphu No,
_set convention generates a convenience property to access all child objects. In a query you should be using the actual model name. See docs.djangoproject.com/en/2.1/topics/db/examples/many_to_one for more examples; for example Reporter.objects.filter(article__headline__startswith='This'). Note that it is article__headline and not article__set__headline.– Selcuk
Nov 14 '18 at 5:13
@kungphu No,
_set convention generates a convenience property to access all child objects. In a query you should be using the actual model name. See docs.djangoproject.com/en/2.1/topics/db/examples/many_to_one for more examples; for example Reporter.objects.filter(article__headline__startswith='This'). Note that it is article__headline and not article__set__headline.– Selcuk
Nov 14 '18 at 5:13
Well that's interesting. I can't say I like the fact that it uses
testdetails instead of test_details; seems a little counter to the way names are usually treated in Python and Django.– kungphu
Nov 14 '18 at 6:59
Well that's interesting. I can't say I like the fact that it uses
testdetails instead of test_details; seems a little counter to the way names are usually treated in Python and Django.– kungphu
Nov 14 '18 at 6:59
@kungphu Agreed, it is a bit inconsistent but I guess the reason was to reduce the number of underscores in a long traversal, or it's just
¯_(ツ)_/¯.– Selcuk
Nov 15 '18 at 3:34
@kungphu Agreed, it is a bit inconsistent but I guess the reason was to reduce the number of underscores in a long traversal, or it's just
¯_(ツ)_/¯.– Selcuk
Nov 15 '18 at 3:34
add a comment |
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1
Try
Test.objects.exclude(testdetails__user=my_user)– Selcuk
Nov 14 '18 at 4:30
1
@Selcuk Doesn't that assume a
related_namethat doesn't appear to be set onTestDetails.test? I think the default would betest_details_setin this case.– kungphu
Nov 14 '18 at 4:34
1
@kungphu No,
_setconvention generates a convenience property to access all child objects. In a query you should be using the actual model name. See docs.djangoproject.com/en/2.1/topics/db/examples/many_to_one for more examples; for exampleReporter.objects.filter(article__headline__startswith='This'). Note that it isarticle__headlineand notarticle__set__headline.– Selcuk
Nov 14 '18 at 5:13
Well that's interesting. I can't say I like the fact that it uses
testdetailsinstead oftest_details; seems a little counter to the way names are usually treated in Python and Django.– kungphu
Nov 14 '18 at 6:59
@kungphu Agreed, it is a bit inconsistent but I guess the reason was to reduce the number of underscores in a long traversal, or it's just
¯_(ツ)_/¯.– Selcuk
Nov 15 '18 at 3:34