Hello all-
I have tried a couple of tips found on the list to solve my problem
with circular model imports, but with no lucks. Here is my basic
schema:
#foo/models.py
from bar.models import Formula
class Variable(models.Model):
amount = models.FloatField(null=True)
is_formula = models.BooleanField(default=False)
formula = models.OneToOneField(Formula, null=True,
related_name="variable_formula")
def get_amount(self):
if self.is_formula:
return self.formula.evaluate()
else:
return self.amount
#bar/models.py
from foo.models import Variable
class Formula(models.Model):
formula = models.TextField() # Where formula is a text string like
'var:1337*var:42', and the numbers are id numbers.
def calculate(self):
# re stuff
for each_found_variable in groups(): # Simplified to show process
- this obviously doesn't work.
raw_string.append(Variable.objects.get(id=this_id).get_amount())
return eval(raw_string, stuff_to_make_eval_safe)
In this case, the circular reference occurs only in a method of the
class - I don't know if this makes a difference. How can I structure
my import statements so that this is possible? I should note that
there are more than one variable, so that combining everything into
one models file is not really possible (and doesn't really address the
chicken/egg problem either).
I thought I saw a recent svn commit that addressed this problem, but
can't find it now.
Any help would be greatly appreciated?
--
############################
Chris Mutel
Ökologisches Systemdesign - Ecological Systems Design
Institut f.Umweltingenieurwissenschaften - Institute for Environmental
Engineering
ETH Zürich - HIF C 42 - Schafmattstr. 6
8093 Zürich
Telefon: +41 44 633 71 45 - Fax: +41 44 633 10 61
############################
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