Django – Retrieve a session value to a form
Question:
I have a Django aplication and need to get a value from the session and put it in a HiddenInput.
I have this code in my view:
@login_required(redirect_field_name='login')
def obra_open_view(request, obra_id):
obra = get_object_or_404(Obra, pk=obra_id)
if obra:
request.session['obra_aberta_id'] = obra.id
request.session['obra_aberta_name'] = obra.nome
return redirect('obra_detail_url')
else:
request.session['obra_aberta_id'] = 0
request.session['obra_aberta_name'] = ""
return redirect('obra_lista_url')
When I have some value on ‘obra_aberta_id’ I need to put this value on a HiddenInput:
class FormCarga(ModelForm):
class Meta:
model = Carga
fields = ('__all__')
widgets = {
'tag': forms.TextInput(attrs={'class': 'form-control'}),
'nome': forms.TextInput(attrs={'class': 'form-control'}),
'descricao': forms.Textarea(attrs={'class': 'form-control'}),
'potencia': forms.TextInput(attrs={'class': 'form-control'}),
'unidade_medida_potencia': forms.Select(attrs={'class': 'form-control'}),
'area': forms.Select(attrs={'class': 'form-control'}),
'tensao': forms.Select(attrs={'class': 'form-control'}),
'fonte': forms.Select(attrs={'class': 'form-control'}),
'atividade': forms.Select(attrs={'class': 'form-control'}),
'fator_potencia': forms.Select(attrs={'class': 'form-control'}),
'condutores_carregados': forms.Select(attrs={'class': 'form-control'}),
'obra': forms.HiddenInput(attrs={'class': 'form-control','initial' : request.session['obra_aberta_id']}),
}
But I’m getting an error on ‘request’: name ‘request’ is not defined
How can I get a value from the session e set os this HiddenInput?
I don’t know if the models will help, but there it is anyway:
class Carga(models.Model):
tag = models.CharField(max_length=10)
nome = models.CharField(max_length=100)
descricao = models.TextField(blank=True,
verbose_name='Descrição')
potencia = models.CharField(blank=True,
max_length=10,
verbose_name='Potência')
unidade_medida_potencia = models.ForeignKey(UnidadeMedidaPotencia,
on_delete=models.DO_NOTHING,
null=True,
blank=True,
verbose_name='Unidade de Medida')
area = models.ForeignKey(Area,
on_delete=models.DO_NOTHING,
null=True,
verbose_name='Área')
tensao = models.ForeignKey(Tensao,
on_delete=models.DO_NOTHING,
null=True,
verbose_name='Tensão')
fonte = models.ForeignKey(Fonte,
on_delete=models.DO_NOTHING,
null=True)
atividade = models.ForeignKey(Atividade,
on_delete=models.DO_NOTHING,
null=True)
fator_potencia = models.ForeignKey(FatorPotencia,
on_delete=models.DO_NOTHING,
null=True,
verbose_name='Fator de Potência')
condutores_carregados = models.ForeignKey(CondutoresCarregados,
on_delete=models.DO_NOTHING,
null=True)
obra = models.ForeignKey(Obra,
on_delete=models.DO_NOTHING,
null=False)
class Obra(models.Model):
nome = models.CharField(max_length=255)
descricao = models.TextField(blank=True,
verbose_name='Descrição') # opcional
cnpj = models.CharField(max_length=15,
blank=True)
revisao = models.CharField(max_length=10,
blank=True,
verbose_name='Revisão') # opcional
descricao_revisao = models.TextField(blank=True,
verbose_name='Descrição da Revisão')
bloqueado = models.BooleanField(default=False)
# Se o externo for apagado, não apaga a obra
cliente = models.ForeignKey(PessoaJuridica,
on_delete=models.DO_NOTHING,
null=True)
participantes = models.ManyToManyField(PessoaFisica,
through='FuncaoPessoaObra')
contato = models.ManyToManyField(Contato)
# (equivalente ao tostring) aparecer o nome no site admin
def __str__(self):
return self.nome
Edit:
Here is my template:
{% extends 'base.html' %}
{% block titulo %}
{{ nome_pagina }}
{% endblock %}
{% block conteudo %}
{% include 'parciais/_messages.html' %}
<h1 class="mt-3 mb-3">
{{ nome_pagina }}
</h1>
<form method="post">
{% csrf_token %}
{{ form.as_p }}
{% if editavel %}
<button type="submit" class="btn btn-primary float-right">Salvar</button>
{% else %}
<a class="btn btn-primary float-right" href="{% url url_lista %}">Lista</a>
{% endif %}
</form>
</br>
{% endblock %}
And here is the view where I will use it:
@login_required(redirect_field_name='login')
def carga_new_view(request):
if request.method == 'POST':
form = FormCarga(request.POST)
if form.is_valid():
form.save()
messages.success(request, 'Carga cadastrada com sucesso!')
# Redirect para a lista de cargas
return redirect('carga_list_url')
else:
form = FormCarga()
nome_pagina = 'Nova Carga'
page_dictionary = {
'form': form,
'nome_pagina': nome_pagina,
'editavel': True,
'url_lista': 'carga_list_url',
}
return render(request, 'item.html', page_dictionary)
Answers:
Please remove from obra widget initial dict.
class FormCarga(ModelForm):
class Meta:
model = Carga
widgets = {
'obra': forms.HiddenInput(),
# other staff
}
After that you can do:
def carga_new_view(request):
initial={'obra': request.session.get('obra_aberta_id')}
if request.method == 'POST':
form = FormCarga(request.POST, initial=initial)
if form.is_valid():
form.save()
messages.success(request, 'Carga cadastrada com sucesso!')
# Redirect para a lista de cargas
return redirect('carga_list_url')
else:
form = FormCarga(initial=initial)
nome_pagina = 'Nova Carga'
page_dictionary = {
'form': form,
'nome_pagina': nome_pagina,
'editavel': True,
'url_lista': 'carga_list_url',
}
return render(request, 'item.html', page_dictionary)
But PLEASE read about Django-GCBV FormView. In your case:
class CargaNewView(FormView):
template = 'item.html'
success_url = 'carga_list_url'
form_class = FormCarga
def get_initial(self, *args, **kwargs):
return super().get_initial(*args, **kwargs) | {'obra': request.session['obra_aberta_id']}
def get_context_data(self, *args, **kwargs):
return super().get_context_data(*args, **kwargs) | {'nome_pagina': 'Nova Carga', 'editavel': True, 'url_lista': self.success_url}
I pass, your have a ModelForm. In this case you can use Django-GCBV EditView.
This is my first question here on StackOverflow. How can I tag my question as solved?
I have a Django aplication and need to get a value from the session and put it in a HiddenInput.
I have this code in my view:
@login_required(redirect_field_name='login')
def obra_open_view(request, obra_id):
obra = get_object_or_404(Obra, pk=obra_id)
if obra:
request.session['obra_aberta_id'] = obra.id
request.session['obra_aberta_name'] = obra.nome
return redirect('obra_detail_url')
else:
request.session['obra_aberta_id'] = 0
request.session['obra_aberta_name'] = ""
return redirect('obra_lista_url')
When I have some value on ‘obra_aberta_id’ I need to put this value on a HiddenInput:
class FormCarga(ModelForm):
class Meta:
model = Carga
fields = ('__all__')
widgets = {
'tag': forms.TextInput(attrs={'class': 'form-control'}),
'nome': forms.TextInput(attrs={'class': 'form-control'}),
'descricao': forms.Textarea(attrs={'class': 'form-control'}),
'potencia': forms.TextInput(attrs={'class': 'form-control'}),
'unidade_medida_potencia': forms.Select(attrs={'class': 'form-control'}),
'area': forms.Select(attrs={'class': 'form-control'}),
'tensao': forms.Select(attrs={'class': 'form-control'}),
'fonte': forms.Select(attrs={'class': 'form-control'}),
'atividade': forms.Select(attrs={'class': 'form-control'}),
'fator_potencia': forms.Select(attrs={'class': 'form-control'}),
'condutores_carregados': forms.Select(attrs={'class': 'form-control'}),
'obra': forms.HiddenInput(attrs={'class': 'form-control','initial' : request.session['obra_aberta_id']}),
}
But I’m getting an error on ‘request’: name ‘request’ is not defined
How can I get a value from the session e set os this HiddenInput?
I don’t know if the models will help, but there it is anyway:
class Carga(models.Model):
tag = models.CharField(max_length=10)
nome = models.CharField(max_length=100)
descricao = models.TextField(blank=True,
verbose_name='Descrição')
potencia = models.CharField(blank=True,
max_length=10,
verbose_name='Potência')
unidade_medida_potencia = models.ForeignKey(UnidadeMedidaPotencia,
on_delete=models.DO_NOTHING,
null=True,
blank=True,
verbose_name='Unidade de Medida')
area = models.ForeignKey(Area,
on_delete=models.DO_NOTHING,
null=True,
verbose_name='Área')
tensao = models.ForeignKey(Tensao,
on_delete=models.DO_NOTHING,
null=True,
verbose_name='Tensão')
fonte = models.ForeignKey(Fonte,
on_delete=models.DO_NOTHING,
null=True)
atividade = models.ForeignKey(Atividade,
on_delete=models.DO_NOTHING,
null=True)
fator_potencia = models.ForeignKey(FatorPotencia,
on_delete=models.DO_NOTHING,
null=True,
verbose_name='Fator de Potência')
condutores_carregados = models.ForeignKey(CondutoresCarregados,
on_delete=models.DO_NOTHING,
null=True)
obra = models.ForeignKey(Obra,
on_delete=models.DO_NOTHING,
null=False)
class Obra(models.Model):
nome = models.CharField(max_length=255)
descricao = models.TextField(blank=True,
verbose_name='Descrição') # opcional
cnpj = models.CharField(max_length=15,
blank=True)
revisao = models.CharField(max_length=10,
blank=True,
verbose_name='Revisão') # opcional
descricao_revisao = models.TextField(blank=True,
verbose_name='Descrição da Revisão')
bloqueado = models.BooleanField(default=False)
# Se o externo for apagado, não apaga a obra
cliente = models.ForeignKey(PessoaJuridica,
on_delete=models.DO_NOTHING,
null=True)
participantes = models.ManyToManyField(PessoaFisica,
through='FuncaoPessoaObra')
contato = models.ManyToManyField(Contato)
# (equivalente ao tostring) aparecer o nome no site admin
def __str__(self):
return self.nome
Edit:
Here is my template:
{% extends 'base.html' %}
{% block titulo %}
{{ nome_pagina }}
{% endblock %}
{% block conteudo %}
{% include 'parciais/_messages.html' %}
<h1 class="mt-3 mb-3">
{{ nome_pagina }}
</h1>
<form method="post">
{% csrf_token %}
{{ form.as_p }}
{% if editavel %}
<button type="submit" class="btn btn-primary float-right">Salvar</button>
{% else %}
<a class="btn btn-primary float-right" href="{% url url_lista %}">Lista</a>
{% endif %}
</form>
</br>
{% endblock %}
And here is the view where I will use it:
@login_required(redirect_field_name='login')
def carga_new_view(request):
if request.method == 'POST':
form = FormCarga(request.POST)
if form.is_valid():
form.save()
messages.success(request, 'Carga cadastrada com sucesso!')
# Redirect para a lista de cargas
return redirect('carga_list_url')
else:
form = FormCarga()
nome_pagina = 'Nova Carga'
page_dictionary = {
'form': form,
'nome_pagina': nome_pagina,
'editavel': True,
'url_lista': 'carga_list_url',
}
return render(request, 'item.html', page_dictionary)
Please remove from obra widget initial dict.
class FormCarga(ModelForm):
class Meta:
model = Carga
widgets = {
'obra': forms.HiddenInput(),
# other staff
}
After that you can do:
def carga_new_view(request):
initial={'obra': request.session.get('obra_aberta_id')}
if request.method == 'POST':
form = FormCarga(request.POST, initial=initial)
if form.is_valid():
form.save()
messages.success(request, 'Carga cadastrada com sucesso!')
# Redirect para a lista de cargas
return redirect('carga_list_url')
else:
form = FormCarga(initial=initial)
nome_pagina = 'Nova Carga'
page_dictionary = {
'form': form,
'nome_pagina': nome_pagina,
'editavel': True,
'url_lista': 'carga_list_url',
}
return render(request, 'item.html', page_dictionary)
But PLEASE read about Django-GCBV FormView. In your case:
class CargaNewView(FormView):
template = 'item.html'
success_url = 'carga_list_url'
form_class = FormCarga
def get_initial(self, *args, **kwargs):
return super().get_initial(*args, **kwargs) | {'obra': request.session['obra_aberta_id']}
def get_context_data(self, *args, **kwargs):
return super().get_context_data(*args, **kwargs) | {'nome_pagina': 'Nova Carga', 'editavel': True, 'url_lista': self.success_url}
I pass, your have a ModelForm. In this case you can use Django-GCBV EditView.
This is my first question here on StackOverflow. How can I tag my question as solved?