I have few models in Django:
from django.db import models
class First(models.Model):
first_name = models.CharField('First Name', max_length=100)
first_value = models.IntegerField('Value')
def __unicode__(self):
return self.first_name
class Second(models.Model):
first_ref = models.ForeignKey(First)
second_name = models.CharField('Second Name', max_length=100)
second_value = models.IntegerField('Second Value')
def __unicode__(self):
return self.second_name
class Third(models.Model):
second_ref = models.ForeignKey(Second)
third_name = models.CharField('Third Name', max_length=100)
third_value = models.IntegerField('Third Value')
def __unicode__(self):
return self.third_name
Now, when I try to add a new record for Third model in my Django admin, my <select> box is populated with second_name values. How can I display a concatenated string of different values from both 'parent' tables, e.g. first_name + first_value + second_name + second_value?
Just update the unicode method of second Model:
class Second(models.Model):
first_ref = models.ForeignKey(First)
second_name = models.CharField('Second Name', max_length=100)
second_value = models.IntegerField('Second Value')
def __unicode__(self):
return '%s %s %s %s' % (
self.first_ref.first_name, self.first_ref.first_value,
self.second_name, self.second_value)
Related
I am new to django and maybe this is a stupid question but i got stuck with this for a while now.. so i have a few categories of meds, like AINS, antidepressants and each of this category has its own meds, and i am trying to show my users all the meds of a specific category: so if a users types in www.namesite.com/meds/AINS the it will show only the meds for that specific category .. AINS.I think that i should get the absolute url of every category and filter all the meds in that specific category?
Model:
class Category(models.Model):
category = models.CharField(max_length=30)
slug = models.SlugField()
def __str__(self):
return self.category
def get_absolute_url(self):
return reverse("meds", kwargs={'slug':self.category})
class Meta:
verbose_name_plural = 'Categorii'
class Medicament(models.Model):
title = models.CharField(max_length=50)
description = models.TextField(max_length=200)
category = models.ForeignKey(Category, on_delete='CASCADE')
price = models.DecimalField(decimal_places=2, max_digits=4)
prospect = models.TextField(default='Prospect')
company = models.TextField(default = 'company')
nr_unitati = models.IntegerField()
quantity = models.CharField(max_length=5, default='mg')
date_added = models.DateTimeField(auto_now_add=True)
rating = models.IntegerField(null=True, blank=True)
amount = models.IntegerField(default=0)
def __str__(self):
return self.title + ' ' + self.company + ' ' + str(self.nr_unitati) + ' ' + self.quantity
class Meta:
verbose_name_plural = 'Medicamente'
Views:
class MedCategoriesView(DetailView):
model = Category
template_name = 'products/AINS.html'
context_object_name = 'all_categories'
def get_context_data(self, **kwargs):
context = super(AINS_ListView, self).get_context_data(**kwargs)
context['meds'] = Medicament.objects.filter(category=self.object)
return context
Urls:
path('medicaments/<slug>/', MedCategoriesView.as_view(), name='meds'),
Using function based views.
def medicament(request, slug):
try:
medicaments = Medicament.objects.filter(category__slug=slug)
except Medicament.DoesNotExist:
raise Http404("Medicament does not exist")
return render(request, 'products/AINS.html', {'medicaments': medicaments})
I get the error "" needs to have a value for field "dataset" before this many-to-many relationship can be used." when trying to assign values to a ManyToMany field in my views. I've looked at many related questions here on SO that say I must save my Dataset object first. I think I am doing that...what is going wrong?? My database already contains four Subject items.
models.py
class Subject(TimeStampedModel):
subject_type = models.CharField(max_length=128, blank=False)
def __unicode__(self):
return self.subject_type
class Dataset(TimeStampedModel):
dataset_id = models.CharField(max_length=256)
dataset_doi = models.CharField(max_length=15)
dataset_name = models.CharField(max_length=256, blank=False)
dataset_description = models.TextField(blank=False)
lab = models.CharField(max_length=256, blank=False)
biological_sample = models.CharField(max_length=256, blank=False)
subject_type = models.ManyToManyField('Subject', related_name='datasets', blank=True)
date_collected = models.DateField(blank=True)
collection_facility = models.ManyToManyField('CollectionFacility', related_name='datasets', blank=True)
processing_notes = models.TextField(blank=True)
release_date = models.DateField()
release_asap = models.BooleanField()
pdb_code = models.CharField(max_length=256, blank=True)
publication_link = models.URLField(blank=True)
def create_name(self):
self.dataset_name = "%s %s" % (self.biological_sample, self.lab)
def save(self, *args, **kwargs):
self.dataset_id = self.id
def __unicode__(self):
return "%s : %s" % (self.dataset_name, self.dataset_id)
forms.py RegistrationForm:
class RegistrationForm(forms.Form):
subject_type = forms.ModelMultipleChoiceField(
label="Subject",
queryset = Subject.objects.all(),
widget=forms.CheckboxSelectMultiple(),
required = True,
)
views.py
def create_registration(form):
dataset = Dataset()
dataset.DOI = "preUpload"
dataset.lab = form.cleaned_data['lab']
dataset.biological_sample = form.cleaned_data['sample']
dataset.resource_type = form.cleaned_data['dataset_type']
dataset.dataset_description = form.cleaned_data['dataset_description']
dataset.date_collected = form.cleaned_data['date_collected']
dataset.release_date = form.cleaned_data['release_date']
dataset.release_asap = form.cleaned_data['release_asap']
if form.cleaned_data['pdb_code']:
dataset.pdb_code = form.cleaned_data['pdb_code']
if form.cleaned_data['publication_link']:
dataset.publication_link = form.cleaned_data['publication_link']
dataset.create_name()
dataset.save() # I don't think this save is working?
subjects = form.cleaned_data['subject_type']
dataset.subject_type = [x for x in subjects]
for facility in form.cleaned_data['facility']
dataset.collection_facility.add(facility)
dataset.save()
return dataset
def registration_submit(request):
registration_form = RegistrationForm(request.POST)
if registration_form.is_valid():
registration = create_registration(registration_form)
.......
You forgot to call the original save() in the overriden Dataset.save() method.
def save(self, *args, **kwargs):
self.dataset_id = self.id
super(Dataset, self).save(*args, **kwargs)
I am trying to understand how exactly query works on Django, i followed the tutorials it´s not working I am not sure what i am doing wrong.
When I run
BeneficientePagar.objects.filter(nome__contains="Joao Pedro")
it returns
"Choices are %s" %s (name, ",".join(available))) django.core.exceptions.FieldError: Cannot resolve keyword "nome into field. Choices are: ID, beneficiente, beneficiente_id,join, join_id, moeda
from django.db import models
# Create your models here.
class Moeda(models.Model):
moeda_ficticia = models.FloatField()
class Join(models.Model):
nome = models.CharField(max_length=150)
nascimento = models.DateField()
cpf = models.IntegerField(primary_key=True)
endereco = models.CharField(max_length=150)
email = models.EmailField()
def __str__(self):
return self.nome
class Beneficiente(models.Model):
ID = models.AutoField(primary_key=True)
nome = models.CharField(max_length=150)
CNPJ = models.IntegerField(max_length = 10)
def __str__(self):
return self.nome
class Favores(models.Model):
ID = models.AutoField(primary_key=True)
favor = models.CharField(max_length=150)
dataInserido = models.DateField()
usuarios = models.ForeignKey(Join)
def __str__(self):
return self.favor
class BeneficientePagar(models.Model):
ID = models.AutoField(primary_key=True)
moeda = models.IntegerField()
beneficiente = models.ForeignKey(Beneficiente)
join = models.ForeignKey(Join)
def __str__(self):
return self.ID
Thanks in advance
If using BeneficientPager, you need to do
BeneficientePagar.objects.filter(beneficient__nome__contains="Joao Pedro")
You are getting the error because nome is a field on Beneficiente, not BeneficientePagar.
You can either do
Beneficiente.objects.filter(nome__contains="Joao Pedro")
which will return a queryset of Beneficientes. Or if you need BeneficientePagar you can query through the foreign key.
BeneficientePagar.objects.filter(beneficiente__nome__contains="Joao Pedro")
I'm starting with Django. I have 3 models, a parent class "Cliente" and two child classes, "Persona" and "Empresa".
models.py
class Cliente(models.Model):
idcliente = models.AutoField(unique=True, primary_key=True)
direccion = models.CharField(max_length=45L, blank=True)
telefono = models.CharField(max_length=45L, blank=True)
email = models.CharField(max_length=45L, blank=True)
def __unicode__(self):
return u'Id: %s' % (self.idcliente)
class Meta:
db_table = 'cliente'
class Empresa(models.Model):
idcliente = models.ForeignKey('Cliente', db_column='idcliente', primary_key=True)
cuit = models.CharField(max_length=45L)
nombre = models.CharField(max_length=60L)
numero_ingresos_brutos = models.CharField(max_length=45L, blank=True)
razon_social = models.CharField(max_length=45L, blank=True)
def __unicode__(self):
return u'CUIT: %s - Nombre: %s' % (self.cuit, self.nombre)
class Meta:
db_table = 'empresa'
class Persona(models.Model):
idcliente = models.ForeignKey('Cliente', db_column='idcliente', primary_key=True)
representante_de = models.ForeignKey('Empresa', null=True, db_column='representante_de', blank=True, related_name='representa_a')
nombre = models.CharField(max_length=45L)
apellido = models.CharField(max_length=45L)
def __unicode__(self):
return u'Id: %s - Nombre completo: %s %s' % (self.idcliente, self.nombre, self.apellido)
class Meta:
db_table = 'persona'
I want to manage a class and its parent in the same view. I want to add, edit and delete "Cliente" and "Persona"/"Cliente" in the same form. Can you help me?
There is a good example in the Documentation Here.
I wrote this based on the documentation, so it is untested.
def manage_books(request, client_id):
client = Cliente.objects.get(pk=client_id)
EmpresaInlineFormSet = inlineformset_factory(Cliente, Empresa)
if request.method == "POST":
formset = EmpresaInlineFormSet(request.POST, request.FILES, instance=author)
if formset.is_valid():
formset.save()
# Do something. Should generally end with a redirect. For example:
return HttpResponseRedirect(client.get_absolute_url())
else:
formset = EmpresaInlineFormSet(instance=client)
return render_to_response("manage_empresa.html", {
"formset": formset,
})
I am using a ForeignKey called Memberno in My Django models. After entering data in the Members Class, it appears in the other classes as "member object" in the 'memberno' field. For ForeignKey, I am using 'raw_id_fields' as a workaround, but for normal fields and even 'filter_horizontal' , each memberno value is displayed as "member object". I would like the values to appear as they are in the member class i.e. 1, 2, ...
from django.db import models
# Create your models here.
class Members(models.Model):
DESIGNATION_CHOICES=(
('ADM', 'Administrator'),
('OFF', 'Club Official'),
('MEM', 'Ordinary Member'),
)
memberno = models.AutoField(primary_key=True)
fname = models.CharField(max_length=15)
sname = models.CharField(max_length=15)
onames = models.CharField(max_length=30, blank=True)
email = models.EmailField()
phoneNumber = models.CharField(max_length=15)
regNo = models.CharField(max_length=15)
designation = models.CharField(max_length=3,choices=DESIGNATION_CHOICES)
image = models.ImageField(max_length=100,upload_to='photos/%Y/%m/%d', blank=True, null=True)
course = models.CharField(max_length=30, blank=True, null=True)
def __unicode__(self):
return u'%s %s %s' % (self.fname, self.sname, self.memberno)
def get_absolute_url(self):
return '%s%s/%s' % (settings.MEDIA_URL, settings.ATTACHMENT_FOLDER, self.id)
def get_download_url(self):
return '%s%s/%s' % (settings.MEDIA_URL, settings.ATTACHMENT_FOLDER, self.name)
class Security(models.Model):
memberno = models.ForeignKey(Members, unique=True)
username = models.CharField(max_length=30, primary_key=True)
password = models.CharField(max_length=70)
def __unicode__(self):
return u'%s %s %s' % (self.username, self.password, self.memberno)
class Subscriptions(models.Model):
memberno = models.ForeignKey(Members)
receiptNo = models.CharField(max_length=30, primary_key=True)
type = models.CharField(max_length=50)
date = models.DateField()
amount = models.FloatField(max_length=99)
def __unicode__(self):
return u'%s %s %s' % (self.receiptno, self.type, self.memberno)
class events(models.Model):
eventName = models.CharField(max_length=25)
eventID = models.AutoField(primary_key=True)
details = models.TextField()
attendanceFee = models.FloatField(max_length=99)
date = models.DateField()
memberno = models.ManyToManyField(Members)
def __unicode__(self):
return u'%s %s %s' % (self.eventName, self.eventID, self.memberno)
The admin interface appears to use __str__() to determine the display of a model. I make it a habbit to always define both __unicode__() and __str__() when I create a model. For example:
class Activity(models.Model):
activity_code = models.ForeignKey(ActivityCode)
note = models.TextField(blank=True)
def __str__(self):
return "(%s) %s" % (self.activity_code.short, self.note)
def __unicode__(self):
return u'(%s) %s' % (self.activity_code.short, self.note)
Update:
It looks as though your def __unicode__(self) is not indented properly in your code. As a result it is not a part of your class, and is not being used. Indenting is very important in Python.
I am not sure I understand your question completely, but have you defined a unicode method for your models?