Form fields missing in Django, just button visable - django

Question

New to Django and having problem seeing form fields displayed. What I see is just the submit button. If pressed, the form is finally presented, but with the format for a form that had bad data (typical 'this field is required' error for each box, red box, etc).
The form works fine after entering data and again pressing submit (stores entries in my db). I have a number of forms on the same page that have the same behavior.
Example of one form:
#model
class dbPara(models.Model): #parameters
timestamp = models.DateTimeField(auto_now_add=True, auto_now=False)
username = models.CharField(max_length=10)
turns = models.FloatField(default=27)
units = models.FloatField(default=5)
rise = models.FloatField(default=2.9)
rescutL = models.FloatField(default=0.0833333333)
rescutH = models.FloatField(default=0.333333333)
LorR = models.CharField(max_length=1, default='R')
def __str__(self):
return self.timestamp, self.username, self.turns, self.units, self.rise, self.rescutL, self.rescutH, self.LorR
#form
class ParaForm(ModelForm):
class Meta:
model = dbPara
widgets = {'username': forms.HiddenInput()}
fields =['username', 'turns', 'units', 'rise', 'rescutL', 'rescutH', 'LorR']
#view
def importParameters(request):
if request.method == 'GET':
form = ParaForm()
else:
form = ParaForm(request.POST)
if form.is_valid():
entry=dbPara(username = request.POST.get('username'),
turns = request.POST.get('turns'),
units = request.POST.get('units'),
rise = request.POST.get('rise'),
rescutL = request.POST.get('rescutL'),
rescutH = request.POST.get('rescutH'),
LorR = request.POST.get('LorR')
)
entry.save()
return render(request, 'main.html',
{'ParaHTML' : form })
#url
urlpatterns = patterns('Inputs.views',
url(r'^importParameters/$', 'importParameters', name='urlParameters'),
)
#main.html
<div class='col-lg-3'>
<h4>Set Rosetta Parameters</h4>
<action="{% url "urlParameters" %}" method="post">{% csrf_token %}
{{ ParaHTML|crispy }}
<input type="hidden" name = "username" value = "{{ user.get_username }}">
<input type="submit" class="btn btn-primary" value="Set">
</form>
</div>
Appreciate any advice (better simple than 'most correct but complicated')
Could it be due to using default in the model? Would that not 'fill in the form' and result in 'POST' at the initial visit to the page, resulting in just the button? Thoughts?

Answer 1

One Suggesestion here ....
if Using request.POST.get('anything') simply then it Will raise error if particular string not find as in example('anything') string...
Because request.POST.get('anything') will return None if 'anything' is not in request.POST.
Additionally, .get allows you to provide an additional parameter of a default value which is returned if the key is not in the dictionary.
e.g: Corrected will be request.POST.get('anything', 'mydefaultvalue')