django insert data from 2 tables using a single ModelForm - database

Question

I want to get data from 2 tables into a form using ModelForm, like this:
fist model:
class Cv(models.Model):
created_by = models.ForeignKey(User, blank=True)
first_name = models.CharField(('first name'), max_length=30, blank=True)
last_name = models.CharField(('last name'), max_length=30, blank=True)
url = models.URLField(verify_exists=True)
picture = models.ImageField(help_text=('Upload an image (max %s kilobytes)' %settings.MAX_PHOTO_UPLOAD_SIZE),upload_to='avatar')
bio = models.CharField(('bio'), max_length=180, blank=True)
expertise= models.ForeignKey(Expertise, blank=True)
date_birth = models.DateField()
second model:
class Expertise(models.Model):
user = models.ForeignKey(User, blank=True)
domain = models.CharField(('domain'), max_length=30, blank=True)
specialisation = models.CharField(('specialization'), max_length=30, blank=True)
degree = models.CharField(('degree'), max_length=30, blank=True)
year_last_degree = models.CharField(('year_last_degree'), max_length=30, blank=True)
lyceum = models.CharField(('lyceum'), max_length=30, blank=True)
faculty = models.CharField(('faculty'), max_length=30, blank=True)
references = models.CharField(('references'), max_length=30, blank=True)
workplace = models.CharField(('workplace'), max_length=30, blank=True)
then i have in forms.py
class CvForm(ModelForm):
class Meta:
model = Cv
fields = ['first_name','last_name','url','picture','bio','date_birth']
class ExpertiseForm(ModelForm):
class Meta:
model = Expertise
fields = ['domain','specialisation']
The point is that i would want to have the both forms into one single form, and a single submit of course. So, i guess i should use a single ModelForm type class. But it doesn't work (if i put the expertise in the CvForm too ).
My form is created automatically from the ModelForm class, that's why i want to make a single class = > a single form.
Help plss,
Thanks a lot

Answer 1

Since there is a foreign key from Expertise to CV, there are potentially multiple expertises for each cv. So you should enable that by using inline formsets.