from django.db import models try: sorted except NameError: from django.utils.itercompat import sorted class Author(models.Model): name = models.CharField(max_length=100) class Meta: ordering = ('name',) def __unicode__(self): return self.name class BetterAuthor(Author): write_speed = models.IntegerField() class Book(models.Model): author = models.ForeignKey(Author) title = models.CharField(max_length=100) def __unicode__(self): return self.title class AuthorMeeting(models.Model): name = models.CharField(max_length=100) authors = models.ManyToManyField(Author) created = models.DateField(editable=False) def __unicode__(self): return self.name class CustomPrimaryKey(models.Model): my_pk = models.CharField(max_length=10, primary_key=True) some_field = models.CharField(max_length=100) __test__ = {'API_TESTS': """ >>> from datetime import date >>> from django.forms.models import modelformset_factory >>> qs = Author.objects.all() >>> AuthorFormSet = modelformset_factory(Author, extra=3) >>> formset = AuthorFormSet(queryset=qs) >>> for form in formset.forms: ... print form.as_p()

>>> data = { ... 'form-TOTAL_FORMS': '3', # the number of forms rendered ... 'form-INITIAL_FORMS': '0', # the number of forms with initial data ... 'form-0-name': 'Charles Baudelaire', ... 'form-1-name': 'Arthur Rimbaud', ... 'form-2-name': '', ... } >>> formset = AuthorFormSet(data=data, queryset=qs) >>> formset.is_valid() True >>> formset.save() [, ] >>> for author in Author.objects.order_by('name'): ... print author.name Arthur Rimbaud Charles Baudelaire Gah! We forgot Paul Verlaine. Let's create a formset to edit the existing authors with an extra form to add him. We *could* pass in a queryset to restrict the Author objects we edit, but in this case we'll use it to display them in alphabetical order by name. >>> qs = Author.objects.order_by('name') >>> AuthorFormSet = modelformset_factory(Author, extra=1, can_delete=False) >>> formset = AuthorFormSet(queryset=qs) >>> for form in formset.forms: ... print form.as_p()

>>> data = { ... 'form-TOTAL_FORMS': '3', # the number of forms rendered ... 'form-INITIAL_FORMS': '2', # the number of forms with initial data ... 'form-0-id': '2', ... 'form-0-name': 'Arthur Rimbaud', ... 'form-1-id': '1', ... 'form-1-name': 'Charles Baudelaire', ... 'form-2-name': 'Paul Verlaine', ... } >>> formset = AuthorFormSet(data=data, queryset=qs) >>> formset.is_valid() True # Only changed or new objects are returned from formset.save() >>> formset.save() [] >>> for author in Author.objects.order_by('name'): ... print author.name Arthur Rimbaud Charles Baudelaire Paul Verlaine This probably shouldn't happen, but it will. If an add form was marked for deltetion, make sure we don't save that form. >>> qs = Author.objects.order_by('name') >>> AuthorFormSet = modelformset_factory(Author, extra=1, can_delete=True) >>> formset = AuthorFormSet(queryset=qs) >>> for form in formset.forms: ... print form.as_p()

>>> data = { ... 'form-TOTAL_FORMS': '4', # the number of forms rendered ... 'form-INITIAL_FORMS': '3', # the number of forms with initial data ... 'form-0-id': '2', ... 'form-0-name': 'Arthur Rimbaud', ... 'form-1-id': '1', ... 'form-1-name': 'Charles Baudelaire', ... 'form-2-id': '3', ... 'form-2-name': 'Paul Verlaine', ... 'form-3-name': 'Walt Whitman', ... 'form-3-DELETE': 'on', ... } >>> formset = AuthorFormSet(data=data, queryset=qs) >>> formset.is_valid() True # No objects were changed or saved so nothing will come back. >>> formset.save() [] >>> for author in Author.objects.order_by('name'): ... print author.name Arthur Rimbaud Charles Baudelaire Paul Verlaine Let's edit a record to ensure save only returns that one record. >>> data = { ... 'form-TOTAL_FORMS': '4', # the number of forms rendered ... 'form-INITIAL_FORMS': '3', # the number of forms with initial data ... 'form-0-id': '2', ... 'form-0-name': 'Walt Whitman', ... 'form-1-id': '1', ... 'form-1-name': 'Charles Baudelaire', ... 'form-2-id': '3', ... 'form-2-name': 'Paul Verlaine', ... 'form-3-name': '', ... 'form-3-DELETE': '', ... } >>> formset = AuthorFormSet(data=data, queryset=qs) >>> formset.is_valid() True # One record has changed. >>> formset.save() [] Test the behavior of commit=False and save_m2m >>> meeting = AuthorMeeting.objects.create(created=date.today()) >>> meeting.authors = Author.objects.all() # create an Author instance to add to the meeting. >>> new_author = Author.objects.create(name=u'John Steinbeck') >>> AuthorMeetingFormSet = modelformset_factory(AuthorMeeting, extra=1, can_delete=True) >>> data = { ... 'form-TOTAL_FORMS': '2', # the number of forms rendered ... 'form-INITIAL_FORMS': '1', # the number of forms with initial data ... 'form-0-id': '1', ... 'form-0-name': '2nd Tuesday of the Week Meeting', ... 'form-0-authors': [2, 1, 3, 4], ... 'form-1-name': '', ... 'form-1-authors': '', ... 'form-1-DELETE': '', ... } >>> formset = AuthorMeetingFormSet(data=data, queryset=AuthorMeeting.objects.all()) >>> formset.is_valid() True >>> instances = formset.save(commit=False) >>> for instance in instances: ... instance.created = date.today() ... instance.save() >>> formset.save_m2m() >>> instances[0].authors.all() [, , , ] # delete the author we created to allow later tests to continue working. >>> new_author.delete() Test the behavior of max_num with model formsets. It should properly limit the queryset to reduce the amount of objects being pulled in when not being used. >>> qs = Author.objects.order_by('name') >>> AuthorFormSet = modelformset_factory(Author, max_num=2) >>> formset = AuthorFormSet(queryset=qs) >>> [sorted(x.items()) for x in formset.initial] [[('id', 1), ('name', u'Charles Baudelaire')], [('id', 3), ('name', u'Paul Verlaine')]] >>> AuthorFormSet = modelformset_factory(Author, max_num=3) >>> formset = AuthorFormSet(queryset=qs) >>> [sorted(x.items()) for x in formset.initial] [[('id', 1), ('name', u'Charles Baudelaire')], [('id', 3), ('name', u'Paul Verlaine')], [('id', 2), ('name', u'Walt Whitman')]] # Model inheritance in model formsets ######################################## >>> BetterAuthorFormSet = modelformset_factory(BetterAuthor) >>> formset = BetterAuthorFormSet() >>> for form in formset.forms: ... print form.as_p()

>>> data = { ... 'form-TOTAL_FORMS': '1', # the number of forms rendered ... 'form-INITIAL_FORMS': '0', # the number of forms with initial data ... 'form-0-author_ptr_id': '', ... 'form-0-name': 'Ernest Hemingway', ... 'form-0-write_speed': '10', ... } >>> formset = BetterAuthorFormSet(data) >>> formset.is_valid() True >>> formset.save() [] >>> hemingway_id = BetterAuthor.objects.get(name="Ernest Hemingway").pk >>> formset = BetterAuthorFormSet() >>> for form in formset.forms: ... print form.as_p()

>>> data = { ... 'form-TOTAL_FORMS': '2', # the number of forms rendered ... 'form-INITIAL_FORMS': '1', # the number of forms with initial data ... 'form-0-author_ptr_id': hemingway_id, ... 'form-0-name': 'Ernest Hemingway', ... 'form-0-write_speed': '10', ... 'form-1-author_ptr_id': '', ... 'form-1-name': '', ... 'form-1-write_speed': '', ... } >>> formset = BetterAuthorFormSet(data) >>> formset.is_valid() True >>> formset.save() [] # Inline Formsets ############################################################ We can also create a formset that is tied to a parent model. This is how the admin system's edit inline functionality works. >>> from django.forms.models import inlineformset_factory >>> AuthorBooksFormSet = inlineformset_factory(Author, Book, can_delete=False, extra=3) >>> author = Author.objects.get(name='Charles Baudelaire') >>> formset = AuthorBooksFormSet(instance=author) >>> for form in formset.forms: ... print form.as_p()

>>> data = { ... 'book_set-TOTAL_FORMS': '3', # the number of forms rendered ... 'book_set-INITIAL_FORMS': '0', # the number of forms with initial data ... 'book_set-0-title': 'Les Fleurs du Mal', ... 'book_set-1-title': '', ... 'book_set-2-title': '', ... } >>> formset = AuthorBooksFormSet(data, instance=author) >>> formset.is_valid() True >>> formset.save() [] >>> for book in author.book_set.all(): ... print book.title Les Fleurs du Mal Now that we've added a book to Charles Baudelaire, let's try adding another one. This time though, an edit form will be available for every existing book. >>> AuthorBooksFormSet = inlineformset_factory(Author, Book, can_delete=False, extra=2) >>> author = Author.objects.get(name='Charles Baudelaire') >>> formset = AuthorBooksFormSet(instance=author) >>> for form in formset.forms: ... print form.as_p()

>>> data = { ... 'book_set-TOTAL_FORMS': '3', # the number of forms rendered ... 'book_set-INITIAL_FORMS': '1', # the number of forms with initial data ... 'book_set-0-id': '1', ... 'book_set-0-title': 'Les Fleurs du Mal', ... 'book_set-1-title': 'Le Spleen de Paris', ... 'book_set-2-title': '', ... } >>> formset = AuthorBooksFormSet(data, instance=author) >>> formset.is_valid() True >>> formset.save() [] As you can see, 'Le Spleen de Paris' is now a book belonging to Charles Baudelaire. >>> for book in author.book_set.order_by('id'): ... print book.title Les Fleurs du Mal Le Spleen de Paris The save_as_new parameter lets you re-associate the data to a new instance. This is used in the admin for save_as functionality. >>> data = { ... 'book_set-TOTAL_FORMS': '3', # the number of forms rendered ... 'book_set-INITIAL_FORMS': '2', # the number of forms with initial data ... 'book_set-0-id': '1', ... 'book_set-0-title': 'Les Fleurs du Mal', ... 'book_set-1-id': '2', ... 'book_set-1-title': 'Le Spleen de Paris', ... 'book_set-2-title': '', ... } >>> formset = AuthorBooksFormSet(data, instance=Author(), save_as_new=True) >>> formset.is_valid() True >>> new_author = Author.objects.create(name='Charles Baudelaire') >>> formset.instance = new_author >>> [book for book in formset.save() if book.author.pk == new_author.pk] [, ] Test using a custom prefix on an inline formset. >>> formset = AuthorBooksFormSet(prefix="test") >>> for form in formset.forms: ... print form.as_p()

# Test a custom primary key ################################################### We need to ensure that it is displayed >>> CustomPrimaryKeyFormSet = modelformset_factory(CustomPrimaryKey) >>> formset = CustomPrimaryKeyFormSet() >>> for form in formset.forms: ... print form.as_p()

"""}