Re: Django ValueError at: Cannot assign "": "Pair.male_mutation" must be a "Mutation" instance."
why it is not creating male_mutation field when I've declared in mode?
On Tuesday, 31 December 2019 17:13:33 UTC+5, Integr@te System wrote:
>
> Hi Issuer,
>
> As error warning, we don't see any male_mutation in Mutation model when
> Pair.male_mutation reference to. As well Species model located.
>
>
>
>
>
>
> On Mon, Dec 30, 2019, 19:31 Muhammad Tariq > wrote:
>
>> I am new to Django facing this error while saving data into DB:
>>
>> "ValueError at /breedingRecApp/pairing
>> Cannot assign "":
>> "Pair.male_mutation" must be a "Mutation" instance."
>>
>> I've 4 foreign keys in Pair model each with specific reason/purposes.
>> when I save data then error come.
>> in the same error page Form Valid is TRUE and Data What I want is also
>> exactly the same. I don't know why data is not saving in DB.
>>
>> Note: When I insert the same data from Admin interface it get save
>> without any error it also get updated and delete as well from admin
>> interface.
>>
>> following are models:
>>
>> models.py
>> class Mutation(models.Model):
>>
>> species = models.ForeignKey(Species, on_delete=models.CASCADE)
>> name = models.CharField(max_length=120, blank=False, null=False)
>> description = models.TextField(max_length=300, blank=False,
>> null=False)
>>
>> class Meta:
>> verbose_name_plural = "Mutations"
>> ordering = ('name',)
>>
>> def __str__(self):
>> return self.name
>>
>> def get_absolute_url_delete(self):
>>
>> return reverse("breedingRecApp:delete_mutation",
>> kwargs={"mutation_id": self.pk})
>>
>> class SpeciesDetail(models.Model):
>>
>> GENDER_CHOICES = (
>> ('M', 'Male'),
>> ('F', 'Female'),
>> )
>> species = models.ForeignKey(Species, on_delete=models.CASCADE)
>> mutation = models.ForeignKey(Mutation, on_delete=models.CASCADE)
>> fatherName = models.CharField(max_length=120)
>> motherName = models.CharField(max_length=120)
>> birdBandNo = models.IntegerField()
>> cageNo = models.IntegerField()
>> picture = models.ImageField(upload_to='pics')
>> gender = models.CharField(max_length=1, choices=GENDER_CHOICES)
>> health = models.CharField(max_length=120)
>> breedingHistory = models.TextField(max_length=300)
>> age = models.IntegerField()
>> dateAcquired = models.DateTimeField(auto_now_add=False, auto_now=True)
>>
>> class Meta:
>> verbose_name_plural = "Species Detail"
>> ordering = ('species', )
>>
>> def __str__(self):
>> return str(self.mutation)
>>
>>
>>
>> class Pair(models.Model):
>> species = models.ForeignKey(Species, on_delete=models.CASCADE)
>> male_mutation = models.ForeignKey(Mutation, on_delete=models.CASCADE,
>> related_name='male_mutation')
>> male = models.ForeignKey(SpeciesDetail, on_delete=models.CASCADE,
>> related_name='male')
>> female_mutation = models.ForeignKey(Mutation,
>> on_delete=models.CASCADE, related_name='female_mutation')
>> female = models.ForeignKey(SpeciesDetail, on_delete=models.CASCADE,
>> related_name='female')
>> boxNo = models.IntegerField()
>> cageNo = models.IntegerField()
>> dateTimeStamp = models.DateTimeField(auto_now_add=True,
>> auto_now=False)
>> description = models.TextField(max_length=300)
>>
>>
>> class Meta:
>> verbose_name_plural = "Pairs"
>>
>> def __str__(self):
>> return str(self.male) + ',' + str(self.female)
>>
>> views.py
>>
>> def pairing(request):
>> if request.method == "POST":
>> form = Pair_ModelForm(request.POST or None)
>> if form.is_valid():
>> try:
>> form.save()
>> return redirect('breedingRecApp:pairs')
>> except:
>> pass
>> else:
>> form = Pair_ModelForm()
>> context = {'title': 'Pairing',
>>'active': 'active',
>>'model': Pair,
>>'form': form,
>>}
>> return render(request, 'breedingRecApp/pairing.html', context)
>>
>>
>> def load_mutations(request):
>> species_id = request.GET.get('species')
>> specific_mutations =
>> Mutation.objects.filter(species_id=species_id).order_by('name')
>> return render(request,
>> 'breedingRecApp/mutations_dropdown_list_options.html', {'mutations':
>> specific_mutations})
>>
>> def load_males(request):
>>
>> mutation_id = request.GET.get('mutation')
>> print(mutation_id)
>> males =
>> SpeciesDetail.objects.filter(mutation_id=mutation_id).filter(gender='M').order_by('id')
>> print('Male Detail', males)
>> return render(request,
>> 'breedingRecApp/males_dropdown_list_options.html', {'males': males})
>>
>> def load_females(request):
>>
>> mutation_id = request.GET.get('mutation')
>> print(mutation_id)
>> females =
>> SpeciesDetail.objects.filter(mutation_id=mutation_id).filter(gender='F').order_by('id')
>> print(females)
>>
Re: Django ValueError at: Cannot assign "": "Pair.male_mutation" must be a "Mutation" instance."
Hi Issuer,
As error warning, we don't see any male_mutation in Mutation model when
Pair.male_mutation reference to. As well Species model located.
On Mon, Dec 30, 2019, 19:31 Muhammad Tariq wrote:
> I am new to Django facing this error while saving data into DB:
>
> "ValueError at /breedingRecApp/pairing
> Cannot assign "":
> "Pair.male_mutation" must be a "Mutation" instance."
>
> I've 4 foreign keys in Pair model each with specific reason/purposes. when
> I save data then error come.
> in the same error page Form Valid is TRUE and Data What I want is also
> exactly the same. I don't know why data is not saving in DB.
>
> Note: When I insert the same data from Admin interface it get save without
> any error it also get updated and delete as well from admin interface.
>
> following are models:
>
> models.py
> class Mutation(models.Model):
>
> species = models.ForeignKey(Species, on_delete=models.CASCADE)
> name = models.CharField(max_length=120, blank=False, null=False)
> description = models.TextField(max_length=300, blank=False, null=False)
>
> class Meta:
> verbose_name_plural = "Mutations"
> ordering = ('name',)
>
> def __str__(self):
> return self.name
>
> def get_absolute_url_delete(self):
>
> return reverse("breedingRecApp:delete_mutation",
> kwargs={"mutation_id": self.pk})
>
> class SpeciesDetail(models.Model):
>
> GENDER_CHOICES = (
> ('M', 'Male'),
> ('F', 'Female'),
> )
> species = models.ForeignKey(Species, on_delete=models.CASCADE)
> mutation = models.ForeignKey(Mutation, on_delete=models.CASCADE)
> fatherName = models.CharField(max_length=120)
> motherName = models.CharField(max_length=120)
> birdBandNo = models.IntegerField()
> cageNo = models.IntegerField()
> picture = models.ImageField(upload_to='pics')
> gender = models.CharField(max_length=1, choices=GENDER_CHOICES)
> health = models.CharField(max_length=120)
> breedingHistory = models.TextField(max_length=300)
> age = models.IntegerField()
> dateAcquired = models.DateTimeField(auto_now_add=False, auto_now=True)
>
> class Meta:
> verbose_name_plural = "Species Detail"
> ordering = ('species', )
>
> def __str__(self):
> return str(self.mutation)
>
>
>
> class Pair(models.Model):
> species = models.ForeignKey(Species, on_delete=models.CASCADE)
> male_mutation = models.ForeignKey(Mutation, on_delete=models.CASCADE,
> related_name='male_mutation')
> male = models.ForeignKey(SpeciesDetail, on_delete=models.CASCADE,
> related_name='male')
> female_mutation = models.ForeignKey(Mutation,
> on_delete=models.CASCADE, related_name='female_mutation')
> female = models.ForeignKey(SpeciesDetail, on_delete=models.CASCADE,
> related_name='female')
> boxNo = models.IntegerField()
> cageNo = models.IntegerField()
> dateTimeStamp = models.DateTimeField(auto_now_add=True, auto_now=False)
> description = models.TextField(max_length=300)
>
>
> class Meta:
> verbose_name_plural = "Pairs"
>
> def __str__(self):
> return str(self.male) + ',' + str(self.female)
>
> views.py
>
> def pairing(request):
> if request.method == "POST":
> form = Pair_ModelForm(request.POST or None)
> if form.is_valid():
> try:
> form.save()
> return redirect('breedingRecApp:pairs')
> except:
> pass
> else:
> form = Pair_ModelForm()
> context = {'title': 'Pairing',
>'active': 'active',
>'model': Pair,
>'form': form,
>}
> return render(request, 'breedingRecApp/pairing.html', context)
>
>
> def load_mutations(request):
> species_id = request.GET.get('species')
> specific_mutations =
> Mutation.objects.filter(species_id=species_id).order_by('name')
> return render(request,
> 'breedingRecApp/mutations_dropdown_list_options.html', {'mutations':
> specific_mutations})
>
> def load_males(request):
>
> mutation_id = request.GET.get('mutation')
> print(mutation_id)
> males =
> SpeciesDetail.objects.filter(mutation_id=mutation_id).filter(gender='M').order_by('id')
> print('Male Detail', males)
> return render(request,
> 'breedingRecApp/males_dropdown_list_options.html', {'males': males})
>
> def load_females(request):
>
> mutation_id = request.GET.get('mutation')
> print(mutation_id)
> females =
> SpeciesDetail.objects.filter(mutation_id=mutation_id).filter(gender='F').order_by('id')
> print(females)
> return render(request,
> 'breedingRecApp/females_dropdown_list_options.html', {'females': females})
>
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Django ValueError at: Cannot assign "": "Pair.male_mutation" must be a "Mutation" instance."
I am new to Django facing this error while saving data into DB:
"ValueError at /breedingRecApp/pairing
Cannot assign "":
"Pair.male_mutation" must be a "Mutation" instance."
I've 4 foreign keys in Pair model each with specific reason/purposes. when
I save data then error come.
in the same error page Form Valid is TRUE and Data What I want is also
exactly the same. I don't know why data is not saving in DB.
Note: When I insert the same data from Admin interface it get save without
any error it also get updated and delete as well from admin interface.
following are models:
models.py
class Mutation(models.Model):
species = models.ForeignKey(Species, on_delete=models.CASCADE)
name = models.CharField(max_length=120, blank=False, null=False)
description = models.TextField(max_length=300, blank=False, null=False)
class Meta:
verbose_name_plural = "Mutations"
ordering = ('name',)
def __str__(self):
return self.name
def get_absolute_url_delete(self):
return reverse("breedingRecApp:delete_mutation",
kwargs={"mutation_id": self.pk})
class SpeciesDetail(models.Model):
GENDER_CHOICES = (
('M', 'Male'),
('F', 'Female'),
)
species = models.ForeignKey(Species, on_delete=models.CASCADE)
mutation = models.ForeignKey(Mutation, on_delete=models.CASCADE)
fatherName = models.CharField(max_length=120)
motherName = models.CharField(max_length=120)
birdBandNo = models.IntegerField()
cageNo = models.IntegerField()
picture = models.ImageField(upload_to='pics')
gender = models.CharField(max_length=1, choices=GENDER_CHOICES)
health = models.CharField(max_length=120)
breedingHistory = models.TextField(max_length=300)
age = models.IntegerField()
dateAcquired = models.DateTimeField(auto_now_add=False, auto_now=True)
class Meta:
verbose_name_plural = "Species Detail"
ordering = ('species', )
def __str__(self):
return str(self.mutation)
class Pair(models.Model):
species = models.ForeignKey(Species, on_delete=models.CASCADE)
male_mutation = models.ForeignKey(Mutation, on_delete=models.CASCADE,
related_name='male_mutation')
male = models.ForeignKey(SpeciesDetail, on_delete=models.CASCADE,
related_name='male')
female_mutation = models.ForeignKey(Mutation, on_delete=models.CASCADE,
related_name='female_mutation')
female = models.ForeignKey(SpeciesDetail, on_delete=models.CASCADE,
related_name='female')
boxNo = models.IntegerField()
cageNo = models.IntegerField()
dateTimeStamp = models.DateTimeField(auto_now_add=True, auto_now=False)
description = models.TextField(max_length=300)
class Meta:
verbose_name_plural = "Pairs"
def __str__(self):
return str(self.male) + ',' + str(self.female)
views.py
def pairing(request):
if request.method == "POST":
form = Pair_ModelForm(request.POST or None)
if form.is_valid():
try:
form.save()
return redirect('breedingRecApp:pairs')
except:
pass
else:
form = Pair_ModelForm()
context = {'title': 'Pairing',
'active': 'active',
'model': Pair,
'form': form,
}
return render(request, 'breedingRecApp/pairing.html', context)
def load_mutations(request):
species_id = request.GET.get('species')
specific_mutations =
Mutation.objects.filter(species_id=species_id).order_by('name')
return render(request,
'breedingRecApp/mutations_dropdown_list_options.html', {'mutations':
specific_mutations})
def load_males(request):
mutation_id = request.GET.get('mutation')
print(mutation_id)
males =
SpeciesDetail.objects.filter(mutation_id=mutation_id).filter(gender='M').order_by('id')
print('Male Detail', males)
return render(request,
'breedingRecApp/males_dropdown_list_options.html', {'males': males})
def load_females(request):
mutation_id = request.GET.get('mutation')
print(mutation_id)
females =
SpeciesDetail.objects.filter(mutation_id=mutation_id).filter(gender='F').order_by('id')
print(females)
return render(request,
'breedingRecApp/females_dropdown_list_options.html', {'females': females})
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