Mixing
Django querying on model which is involved in generic relation
Here I have 2 models, Company and UserSupervision. Company is related as a foreign key with generic relation model UserSupervision.
I want to have a query as following:
Company.objects.filter(**{'usersupervision__content_type': Company,
'usersupervision__user': some_user,
'usersupervision__date_cancelled': None})
So, I want to get all companies of some_user appeared in UserSupervision model. I know that Company and UserSupervision are not directly related, so i thought, maybe i have to use raw sql with joins? Or any other more appropriate solution?
class Company(models.Model):
id = models.UUIDField(blank=True, editable=False, primary_key=True, default=uuid.uuid4)
name = models.CharField(max_length=150, unique=True)
users = models.ManyToManyField(User, related_name='companies', through='CompanyMembership')
date_created = models.DateTimeField('created date', blank=True, editable=False, auto_now_add=True)
date_updated = models.DateTimeField('updated date', blank=True, editable=False, auto_now=True)
class UserSupervision(models.Model):
user = models.ForeignKey(User, on_delete=models.SET_NULL, null=True)
supervision = models.ForeignKey(Supervision, on_delete=models.SET_NULL, null=True)
content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
object_id = models.UUIDField()
content_object = GenericForeignKey()
date_assigned = models.DateTimeField('assigned date', blank=True, editable=False, auto_now_add=True)
date_cancelled = models.DateTimeField('cancelled date', blank=True, null=True, default=None)
sql django django-models querying
edited Nov 19 '18 at 16:34
Daniel Roseman
444k41575631
asked Nov 19 '18 at 16:09
Bedilbek
82
add a comment |
Here I have 2 models, Company and UserSupervision. Company is related as a foreign key with generic relation model UserSupervision.
I want to have a query as following:
Company.objects.filter(**{'usersupervision__content_type': Company,
'usersupervision__user': some_user,
'usersupervision__date_cancelled': None})
So, I want to get all companies of some_user appeared in UserSupervision model. I know that Company and UserSupervision are not directly related, so i thought, maybe i have to use raw sql with joins? Or any other more appropriate solution?
class Company(models.Model):
id = models.UUIDField(blank=True, editable=False, primary_key=True, default=uuid.uuid4)
name = models.CharField(max_length=150, unique=True)
users = models.ManyToManyField(User, related_name='companies', through='CompanyMembership')
date_created = models.DateTimeField('created date', blank=True, editable=False, auto_now_add=True)
date_updated = models.DateTimeField('updated date', blank=True, editable=False, auto_now=True)
class UserSupervision(models.Model):
user = models.ForeignKey(User, on_delete=models.SET_NULL, null=True)
supervision = models.ForeignKey(Supervision, on_delete=models.SET_NULL, null=True)
content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
object_id = models.UUIDField()
content_object = GenericForeignKey()
date_assigned = models.DateTimeField('assigned date', blank=True, editable=False, auto_now_add=True)
date_cancelled = models.DateTimeField('cancelled date', blank=True, null=True, default=None)
sql django django-models querying
edited Nov 19 '18 at 16:34
Daniel Roseman
444k41575631
asked Nov 19 '18 at 16:09
Bedilbek
82
add a comment |
Here I have 2 models, Company and UserSupervision. Company is related as a foreign key with generic relation model UserSupervision.
I want to have a query as following:
Company.objects.filter(**{'usersupervision__content_type': Company,
'usersupervision__user': some_user,
'usersupervision__date_cancelled': None})
So, I want to get all companies of some_user appeared in UserSupervision model. I know that Company and UserSupervision are not directly related, so i thought, maybe i have to use raw sql with joins? Or any other more appropriate solution?
class Company(models.Model):
id = models.UUIDField(blank=True, editable=False, primary_key=True, default=uuid.uuid4)
name = models.CharField(max_length=150, unique=True)
users = models.ManyToManyField(User, related_name='companies', through='CompanyMembership')
date_created = models.DateTimeField('created date', blank=True, editable=False, auto_now_add=True)
date_updated = models.DateTimeField('updated date', blank=True, editable=False, auto_now=True)
class UserSupervision(models.Model):
user = models.ForeignKey(User, on_delete=models.SET_NULL, null=True)
supervision = models.ForeignKey(Supervision, on_delete=models.SET_NULL, null=True)
content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
object_id = models.UUIDField()
content_object = GenericForeignKey()
date_assigned = models.DateTimeField('assigned date', blank=True, editable=False, auto_now_add=True)
date_cancelled = models.DateTimeField('cancelled date', blank=True, null=True, default=None)
sql django django-models querying
edited Nov 19 '18 at 16:34
Daniel Roseman
444k41575631
asked Nov 19 '18 at 16:09
Bedilbek
82
Here I have 2 models, Company and UserSupervision. Company is related as a foreign key with generic relation model UserSupervision.
I want to have a query as following:
Company.objects.filter(**{'usersupervision__content_type': Company,
'usersupervision__user': some_user,
'usersupervision__date_cancelled': None})
So, I want to get all companies of some_user appeared in UserSupervision model. I know that Company and UserSupervision are not directly related, so i thought, maybe i have to use raw sql with joins? Or any other more appropriate solution?
class Company(models.Model):
id = models.UUIDField(blank=True, editable=False, primary_key=True, default=uuid.uuid4)
name = models.CharField(max_length=150, unique=True)
users = models.ManyToManyField(User, related_name='companies', through='CompanyMembership')
date_created = models.DateTimeField('created date', blank=True, editable=False, auto_now_add=True)
date_updated = models.DateTimeField('updated date', blank=True, editable=False, auto_now=True)
class UserSupervision(models.Model):
user = models.ForeignKey(User, on_delete=models.SET_NULL, null=True)
supervision = models.ForeignKey(Supervision, on_delete=models.SET_NULL, null=True)
content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
object_id = models.UUIDField()
content_object = GenericForeignKey()
date_assigned = models.DateTimeField('assigned date', blank=True, editable=False, auto_now_add=True)
date_cancelled = models.DateTimeField('cancelled date', blank=True, null=True, default=None)
sql django django-models querying
sql django django-models querying
edited Nov 19 '18 at 16:34
Daniel Roseman
444k41575631
asked Nov 19 '18 at 16:09
Bedilbek
82
edited Nov 19 '18 at 16:34
Daniel Roseman
444k41575631
asked Nov 19 '18 at 16:09
Bedilbek
82
edited Nov 19 '18 at 16:34
Daniel Roseman
444k41575631
edited Nov 19 '18 at 16:34
Daniel Roseman
444k41575631
edited Nov 19 '18 at 16:34
Daniel Roseman
444k41575631
444k41575631
asked Nov 19 '18 at 16:09
Bedilbek
82
asked Nov 19 '18 at 16:09
Bedilbek
82
asked Nov 19 '18 at 16:09
Bedilbek
82
82
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
So you want to find all the Companies in UserSupervision for a certian UserSupervision.user? Something like:
user_supervisions = UserSupervision.objects.filter(
content_type=ContentType.objects.get_for_model(Company),
user=some_user,
date_cancelled=None
).order_by('content_type_id', 'object_id').distinct('content_type_id', 'object_id')
companies = [us.object_id for us in usersupervisions] # Loop to create list of company ids.
You can drop the order_by and distinct if you're not using PostgreSQL, but the companies loop would need to be changed to account for duplicate entries.
answered Nov 19 '18 at 17:33
Bott0610
588211
Thanks for the reply, but I wanted to have querying method or raw-sql method, because, first fetching from database and again filtering with python is time and memory consuming job, I knew that i could do it with this kind of simple wrangling around, but it would be more concise and accurate if only one time querying with filtering is made, anyway thanks:)
– Bedilbek
Nov 19 '18 at 17:49
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
So you want to find all the Companies in UserSupervision for a certian UserSupervision.user? Something like:
user_supervisions = UserSupervision.objects.filter(
content_type=ContentType.objects.get_for_model(Company),
user=some_user,
date_cancelled=None
).order_by('content_type_id', 'object_id').distinct('content_type_id', 'object_id')
companies = [us.object_id for us in usersupervisions] # Loop to create list of company ids.
You can drop the order_by and distinct if you're not using PostgreSQL, but the companies loop would need to be changed to account for duplicate entries.
answered Nov 19 '18 at 17:33
Bott0610
588211
Thanks for the reply, but I wanted to have querying method or raw-sql method, because, first fetching from database and again filtering with python is time and memory consuming job, I knew that i could do it with this kind of simple wrangling around, but it would be more concise and accurate if only one time querying with filtering is made, anyway thanks:)
– Bedilbek
Nov 19 '18 at 17:49
add a comment |
So you want to find all the Companies in UserSupervision for a certian UserSupervision.user? Something like:
user_supervisions = UserSupervision.objects.filter(
content_type=ContentType.objects.get_for_model(Company),
user=some_user,
date_cancelled=None
).order_by('content_type_id', 'object_id').distinct('content_type_id', 'object_id')
companies = [us.object_id for us in usersupervisions] # Loop to create list of company ids.
You can drop the order_by and distinct if you're not using PostgreSQL, but the companies loop would need to be changed to account for duplicate entries.
answered Nov 19 '18 at 17:33
Bott0610
588211
Thanks for the reply, but I wanted to have querying method or raw-sql method, because, first fetching from database and again filtering with python is time and memory consuming job, I knew that i could do it with this kind of simple wrangling around, but it would be more concise and accurate if only one time querying with filtering is made, anyway thanks:)
– Bedilbek
Nov 19 '18 at 17:49
add a comment |
So you want to find all the Companies in UserSupervision for a certian UserSupervision.user? Something like:
user_supervisions = UserSupervision.objects.filter(
content_type=ContentType.objects.get_for_model(Company),
user=some_user,
date_cancelled=None
).order_by('content_type_id', 'object_id').distinct('content_type_id', 'object_id')
companies = [us.object_id for us in usersupervisions] # Loop to create list of company ids.
You can drop the order_by and distinct if you're not using PostgreSQL, but the companies loop would need to be changed to account for duplicate entries.
answered Nov 19 '18 at 17:33
Bott0610
588211
So you want to find all the Companies in UserSupervision for a certian UserSupervision.user? Something like:
user_supervisions = UserSupervision.objects.filter(
content_type=ContentType.objects.get_for_model(Company),
user=some_user,
date_cancelled=None
).order_by('content_type_id', 'object_id').distinct('content_type_id', 'object_id')
companies = [us.object_id for us in usersupervisions] # Loop to create list of company ids.
You can drop the order_by and distinct if you're not using PostgreSQL, but the companies loop would need to be changed to account for duplicate entries.
answered Nov 19 '18 at 17:33
Bott0610
588211
answered Nov 19 '18 at 17:33
Bott0610
588211
answered Nov 19 '18 at 17:33
Bott0610
588211
answered Nov 19 '18 at 17:33
Bott0610
588211
588211
Thanks for the reply, but I wanted to have querying method or raw-sql method, because, first fetching from database and again filtering with python is time and memory consuming job, I knew that i could do it with this kind of simple wrangling around, but it would be more concise and accurate if only one time querying with filtering is made, anyway thanks:)
– Bedilbek
Nov 19 '18 at 17:49
add a comment |
Thanks for the reply, but I wanted to have querying method or raw-sql method, because, first fetching from database and again filtering with python is time and memory consuming job, I knew that i could do it with this kind of simple wrangling around, but it would be more concise and accurate if only one time querying with filtering is made, anyway thanks:)
– Bedilbek
Nov 19 '18 at 17:49
Thanks for the reply, but I wanted to have querying method or raw-sql method, because, first fetching from database and again filtering with python is time and memory consuming job, I knew that i could do it with this kind of simple wrangling around, but it would be more concise and accurate if only one time querying with filtering is made, anyway thanks:)
– Bedilbek
Nov 19 '18 at 17:49
Thanks for the reply, but I wanted to have querying method or raw-sql method, because, first fetching from database and again filtering with python is time and memory consuming job, I knew that i could do it with this kind of simple wrangling around, but it would be more concise and accurate if only one time querying with filtering is made, anyway thanks:)
– Bedilbek
Nov 19 '18 at 17:49
add a comment |
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