Question

class Person(models.Model):     name = models.CharField(max_length=100)  class Entry(models.Model):     text = models.CharField(max_length=100)     person = models.ManyToManyField(Person, blank=True, null=True)  class MyModelForm(forms.ModelForm):     class Meta:         model = Entry 

In my view, I need to add pk id’s to a submitted form before saving it.

data = request.POST.copy() # 'person' is a ManyToManyField to a 'Person' model # a form would normally send multiple id's as POST in this format -> u'id': [u'1', u'2'] # u'1,2' (an example) is a str variable accessible to the view data[u'person'] = u'1,2'.split(',')  form = MyModelForm(data) if form.is_valid():     form.save() 

This gives me:

int() argument must be a string or a number, not ‘list’

Which is fair enough. It does work in case of:

data[u'person'] = u'1' 

I also tried this with no success:

new_form = form.save(commit=False) new_form.person = u'1,2'.split(',') new_form.save() form.save_m2m() 

How can I save multiple id’s to this ManyToManyField?
Must be easy but I am missing the point.

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EDIT: The desired result is one new instance of MyModelForm (in the ‘entry’ table) with all id’s stored for form.person (multiple records in the ‘entry_person’ table).

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UPDATE: I seem to have isolated the problem.

If I do:

data = {}   data[u'person'] = u'1,2'.split(',') 

It does work as the result is:

{u'person': [u'1', u'2'],}   

If I do:

data = request.POST.copy()   data[u'person'] = u'1,2'.split(',') 

It does NOT work (gives the error described above) as the result is:

<QueryDict: {u'person': [[u'1', u'2']],}> 

So all I need is to have

<QueryDict: {u'person': [u'1', u'2'],}> 

Any suggestions how?

Answer 1

QueryDict.setlist(key, list_) solves this problem.

Answered in A workaround for Django QueryDict wrapping values in lists?