Does adding a def __unicode__(self): method into a model affect the queries
being returned ?
I am currently experiencing a situation in which the presence of def
__unicode__(self): in the model is interfering with the results being
returned.
These two are my models
class modelLabTestName(models.Model):
test_category = models.ForeignKey(modelLabCategory)
test_name = models.CharField(max_length=128, unique=True ,
default="None")
def __unicode__(self):
return self.test_name #---------------------->--- Line A----
#return "Test Name : " + self.test_name ------->--- Line B----
class modelNormalLabTest(models.Model):
test_name = models.ForeignKey(modelLabTestName,default=None)
field_name = models.CharField(max_length=128)
field_value = models.CharField(max_length=128)
Now notice in the above there are two lines A and B. Currently Line B is
commented and this query works and I get back an object
lab_entries= modelNormalLabTest.objects.filter(test_name__test_name="ABC")
However if I replace
return self.test_name
in the model modelLabTestName with this instead (Line B)
return "Test Name : " + self.test_name
The query fails (i.e - No object is returned)
My question is why is this happening and if there is any way for me to fix
this issue. I already checked the value of the test_name property with the
following statement and it is returning the correct value
t = modelLabTestName.objects.all()[0].test_name #t = "ABC"
then why is
lab_entries= modelNormalLabTest.objects.filter(test_name__test_name="ABC")
or even this
modelLabTestName.objects.get(test_name="ABC");
returning nothing ? when the model modelLabTestname has the following
method in it
def __unicode__(self):
return "Test Name : " + self.test_name
Any suggestions would be appreciated. I am using Django (1.10.5)
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