I'm implementing simple "grade book" application where
the teacher would be able to update
the grades w/o being allowed to change
the students' names (at least not on
the update grade page). To do this I'm using one of
the read-only tricks,
the simplest one.
The problem is that after
the SUBMIT
the view is re-displayed with 'blank' values for
the students. I'd like
the students' names to re-appear.
Below is
the simplest example that exhibits this problem. (This is poor DB design, I know, I've extracted just
the relevant parts of
the code to showcase
the problem. In
the real example, student is in its own table but
the problem still exists there.)
models.py
class Grade1(models.Model):
student = models.CharField(max_length=50, unique=True)
finalGrade = models.CharField(max_length=3)
class Grade1OForm(ModelForm):
student = forms.CharField(max_length=50, required=False)
def __init__(self, *args, **kwargs):
super(Grade1OForm,self).__init__(*args, **kwargs)
instance = getattr(self, 'instance', None)
if instance and instance.id:
self.fields['student'].widget.attrs['readonly'] = True
self.fields['student'].widget.attrs['disabled'] = 'disabled'
def clean_student(self):
instance = getattr(self,'instance',None)
if instance:
return instance.student
else:
return self.cleaned_data.get('student',None)
class Meta:
model=Grade1
views.py
from django.forms.models import modelformset_factory
def modifyAllGrades1(request):
gradeFormSetFactory = modelformset_factory(Grade1, form=Grade1OForm, extra=0)
studentQueryset = Grade1.objects.all()
if request.method=='POST':
myGradeFormSet = gradeFormSetFactory(request.POST, queryset=studentQueryset)
if myGradeFormSet.is_valid():
myGradeFormSet.save()
info = "successfully modified"
else:
myGradeFormSet = gradeFormSetFactory(queryset=studentQueryset)
return render_to_response('grades/modifyAllGrades.html',locals())
template
<p>{{ info }}</p>
<form method="POST" action="">
<table>
{{ myGradeFormSet.management_form }}
{% for myform in myGradeFormSet.forms %}
{# myform.as_table #}
<tr>
{% for field in myform %}
<td> {{ field }} {{ field.errors }} </td>
{% endfor %}
</tr>
{% endfor %}
</table>
<input type="submit" value="Submit">
</form>
