Re: Set two fields to the same value
On 12-7-2012 15:51, Jaroslav Dobrek wrote:
> Users may create Test objects in order to run their own tests. A test
> always starts at some date time and it always ends at some date time. Each
> test has a time which is increased until it equals the end time. When a
> user creates a new test (and before he uses it) the field time should have
> the same value as the field start_time.
(Assuming the time field should be stored in the database)
Simplest, but specific for temporal fields:
class Test(models.Model) :
start_time = models.DateTimeField(auto_now_add=True)
end_time = models.DateTimeField(auto_now_add=True)
time = models.DateTimeField(auto_now_add=True)
Generally working:
class Test(models.Model) :
first = models.CharField(max_length=10, default='first')
second = models.CharField(max_length=10)
def __init__(self, *args, **kwargs) :
first = kwargs.get('first', False)
if not first :
first = self.__class__.first.default
second = first
if not kwargs.get('second', False) :
kwargs['second'] = second
super(Test, self).__init__(*args, **kwargs)
For the admin, see
for an alternate solution.
--
Melvyn Sopacua
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Re: Set two fields to the same value
you could only assign a Field variable in the Model, "time" absolutely not a Field, the error appears. -- luthur On Thursday, July 12, 2012 at 9:51 PM, Jaroslav Dobrek wrote: > Hello, > > how can I design a model such that two fields are set to the same value when > a new object of the type defined by the model is created? > > Example: > > class Test(models.Model): > start_time = models.DateTimeField() > end_time = models.DateTimeField() > time = start_time > > > Users may create Test objects in order to run their own tests. A test always > starts at some date time and it always ends at some date time. Each test has > a time which is increased until it equals the end time. When a user creates a > new test (and before he uses it) the field time should have the same value as > the field start_time. > > The code above will produce a database error. > > Jaroslav > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/django-users/-/ekl9tv3zHTIJ. > To post to this group, send email to django-users@googlegroups.com > (mailto:django-users@googlegroups.com). > To unsubscribe from this group, send email to > django-users+unsubscr...@googlegroups.com > (mailto:django-users+unsubscr...@googlegroups.com). > For more options, visit this group at > http://groups.google.com/group/django-users?hl=en. -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
RE: Set two fields to the same value
You could override .save... -Mensaje original- De: Jaroslav Dobrek Enviados: 12/07/2012 10:51:08 Asunto: Set two fields to the same value Hello, how can I design a model such that two fields are set to the same value when a new object of the type defined by the model is created? Example: class Test(models.Model): start_time = models.DateTimeField() end_time = models.DateTimeField() time = start_time Users may create Test objects in order to run their own tests. A test always starts at some date time and it always ends at some date time. Each test has a time which is increased until it equals the end time. When a user creates a new test (and before he uses it) the field time should have the same value as the field start_time. The code above will produce a database error. Jaroslav -- You received this message because you are subscribed to the Google Groups "Django users" group. To view this discussion on the web visit https://groups.google.com/d/msg/django-users/-/ekl9tv3zHTIJ. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en. -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
Set two fields to the same value
Hello, how can I design a model such that two fields are set to the same value when a new object of the type defined by the model is created? Example: class Test(models.Model): start_time = models.DateTimeField() end_time = models.DateTimeField() time = start_time Users may create Test objects in order to run their own tests. A test always starts at some date time and it always ends at some date time. Each test has a time which is increased until it equals the end time. When a user creates a new test (and before he uses it) the field time should have the same value as the field start_time. The code above will produce a database error. Jaroslav -- You received this message because you are subscribed to the Google Groups "Django users" group. To view this discussion on the web visit https://groups.google.com/d/msg/django-users/-/ekl9tv3zHTIJ. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
