How to add data into ManyToMany field

Question

I can t find it anywhere  so your help will be nice for me    Here is that field   categories   models ManyToManyField fragmentCategory    FragmentCategory   class fragmentCategory models Model            CATEGORY CHOICES                               val1    value1                              val2    value2                              val3    value3                                       name   models CharField max length 20  choices CATEGORY CHOICES    Here is the form to send    lt input type  checkbox  name  val1    gt   lt input type  checkbox  name  val2    gt   lt input type  checkbox  name  val3    gt      I tried something like this    categories   fragmentCategory objects get id 1     Or   categories    1 2

User · Answer

In case someone else ends up here struggling to customize admin form Many2Many saving behaviour, you can't call self.instance.my_m2m.add(obj) in your ModelForm.save override, as ModelForm.save later populates your m2m from self.cleaned_data['my_m2m'] which overwrites your changes. Instead call:

my_m2ms = list(self.cleaned_data['my_m2ms'])
my_m2ms.extend(my_custom_new_m2ms)
self.cleaned_data['my_m2ms'] = my_m2ms

(It is fine to convert the incoming QuerySet to a list - the ManyToManyField does that anyway.)

User · Answer

There s a whole page of the Django documentation devoted to this  well indexed from the contents page   As that page states  you need to do   my obj categories add fragmentCategory objects get id 1     or  my obj categories create name  val1

[django] How to add data into ManyToMany field?

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