[Django]-Django admin – how can I use save_related() to parse data from inline forms?

by

4👍

For anyone coming here looking for ways to hook into Django’s M2M inline form changes (like I was) here’s what I found simple and worked:

class HostelAdmin(admin.ModelAdmin):
    inlines = [HostelGuestInline, HostelEntryPointInline]

    def save_related(self, request, form, formsets, change):
        for formset in formsets:
            # Found this simple way to check dynamic class instance.
            if formset.model == HostelGuest:
                instances = formset.save(commit=False)

                hostel = form.instance

                for added_hostel_guest in formset.new_objects:
                    # Do something with new objects added (not tested this, though)

                for deleted_hostel_guest in formset.deleted_objects:
                    do_something_with_deleted_guest_and_parent_instance(
                        deleted_hostel_guest.pk,
                        hostel.pk
                    )

        super(HostelAdmin, self).save_related(request, form, formsets, change)
👤James Broad

2👍

you can use Form in your admin.TabularInline.

this is example.

class HostelGuestForm(forms.ModelForm):
    # set your code.

class HostelGuestInline(admin.TabularInline):
    model=HostelGuest
    form = HostelGuestForm
    extra=4

if you want call external API, this is one of solutions.
you should type on your class HostelAdmin

def save_formset(self, request, form, formset, change):
    if formset == formset_factory(HostelGuestForm):
        # this `if` is check for formset is for HostelGuest
        instances = formset.save(commit=False)
        # it returns your added, changed, deleted instance
        # if you don't have to check that instance is added or changed or deleted, below code is not required.
        for instance in instances:
            if instance.pk == None:
                # this is added
            elif:
                # check `change` for is changed or deleted
        formset.save_m2m()
    else:
        pass

the def save_formset() is called by save_related(), and the reason about not change save_related, change save_formset is for other inline form. because inline formset can possible for be added not only HostelGuest.

👤beCurious

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