BaseFormSet.can_delete
Default: False
Lets you create a formset with the ability to select forms for deletion:
>>> from django.forms import formset_factory
>>> from myapp.forms import ArticleForm
>>> ArticleFormSet = formset_factory(ArticleForm, can_delete=True)
>>> formset = ArticleFormSet(initial=[
... {'title': 'Article #1', 'pub_date': datetime.date(2008, 5, 10)},
... {'title': 'Article #2', 'pub_date': datetime.date(2008, 5, 11)},
... ])
>>> for form in formset:
... print(form.as_table())
<tr><th><label for="id_form-0-title">Title:</label></th><td><input type="text" name="form-0-title" value="Article #1" id="id_form-0-title" /></td></tr>
<tr><th><label for="id_form-0-pub_date">Pub date:</label></th><td><input type="text" name="form-0-pub_date" value="2008-05-10" id="id_form-0-pub_date" /></td></tr>
<tr><th><label for="id_form-0-DELETE">Delete:</label></th><td><input type="checkbox" name="form-0-DELETE" id="id_form-0-DELETE" /></td></tr>
<tr><th><label for="id_form-1-title">Title:</label></th><td><input type="text" name="form-1-title" value="Article #2" id="id_form-1-title" /></td></tr>
<tr><th><label for="id_form-1-pub_date">Pub date:</label></th><td><input type="text" name="form-1-pub_date" value="2008-05-11" id="id_form-1-pub_date" /></td></tr>
<tr><th><label for="id_form-1-DELETE">Delete:</label></th><td><input type="checkbox" name="form-1-DELETE" id="id_form-1-DELETE" /></td></tr>
<tr><th><label for="id_form-2-title">Title:</label></th><td><input type="text" name="form-2-title" id="id_form-2-title" /></td></tr>
<tr><th><label for="id_form-2-pub_date">Pub date:</label></th><td><input type="text" name="form-2-pub_date" id="id_form-2-pub_date" /></td></tr>
<tr><th><label for="id_form-2-DELETE">Delete:</label></th><td><input type="checkbox" name="form-2-DELETE" id="id_form-2-DELETE" /></td></tr>
Similar to can_order this adds a new field to each form named DELETE and is a forms.BooleanField. When data comes through marking any of the delete fields you can access them with deleted_forms:
>>> data = {
... 'form-TOTAL_FORMS': '3',
... 'form-INITIAL_FORMS': '2',
... 'form-MAX_NUM_FORMS': '',
... 'form-0-title': 'Article #1',
... 'form-0-pub_date': '2008-05-10',
... 'form-0-DELETE': 'on',
... 'form-1-title': 'Article #2',
... 'form-1-pub_date': '2008-05-11',
... 'form-1-DELETE': '',
... 'form-2-title': '',
... 'form-2-pub_date': '',
... 'form-2-DELETE': '',
... }
>>> formset = ArticleFormSet(data, initial=[
... {'title': 'Article #1', 'pub_date': datetime.date(2008, 5, 10)},
... {'title': 'Article #2', 'pub_date': datetime.date(2008, 5, 11)},
... ])
>>> [form.cleaned_data for form in formset.deleted_forms]
[{'DELETE': True, 'pub_date': datetime.date(2008, 5, 10), 'title': 'Article #1'}]
If you are using a ModelFormSet, model instances for deleted forms will be deleted when you call formset.save().
If you call formset.save(commit=False), objects will not be deleted automatically. You’ll need to call delete() on each of the formset.deleted_objects to actually delete them:
>>> instances = formset.save(commit=False) >>> for obj in formset.deleted_objects: ... obj.delete()
On the other hand, if you are using a plain FormSet, it’s up to you to handle formset.deleted_forms, perhaps in your formset’s save() method, as there’s no general notion of what it means to delete a form.
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