329 lines
13 KiB
Python
329 lines
13 KiB
Python
from django.db import models
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class Author(models.Model):
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name = models.CharField(max_length=100)
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class Meta:
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ordering = ('name',)
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def __unicode__(self):
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return self.name
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class Book(models.Model):
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author = models.ForeignKey(Author)
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title = models.CharField(max_length=100)
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def __unicode__(self):
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return self.title
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class AuthorMeeting(models.Model):
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name = models.CharField(max_length=100)
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authors = models.ManyToManyField(Author)
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created = models.DateField(editable=False)
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def __unicode__(self):
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return self.name
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__test__ = {'API_TESTS': """
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>>> from datetime import date
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>>> from django.forms.models import modelformset_factory
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>>> qs = Author.objects.all()
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>>> AuthorFormSet = modelformset_factory(Author, extra=3)
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>>> formset = AuthorFormSet(queryset=qs)
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>>> for form in formset.forms:
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... print form.as_p()
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<p><label for="id_form-0-name">Name:</label> <input id="id_form-0-name" type="text" name="form-0-name" maxlength="100" /><input type="hidden" name="form-0-id" id="id_form-0-id" /></p>
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<p><label for="id_form-1-name">Name:</label> <input id="id_form-1-name" type="text" name="form-1-name" maxlength="100" /><input type="hidden" name="form-1-id" id="id_form-1-id" /></p>
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<p><label for="id_form-2-name">Name:</label> <input id="id_form-2-name" type="text" name="form-2-name" maxlength="100" /><input type="hidden" name="form-2-id" id="id_form-2-id" /></p>
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>>> data = {
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... 'form-TOTAL_FORMS': '3', # the number of forms rendered
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... 'form-INITIAL_FORMS': '0', # the number of forms with initial data
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... 'form-0-name': 'Charles Baudelaire',
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... 'form-1-name': 'Arthur Rimbaud',
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... 'form-2-name': '',
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... }
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>>> formset = AuthorFormSet(data=data, queryset=qs)
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>>> formset.is_valid()
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True
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>>> formset.save()
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[<Author: Charles Baudelaire>, <Author: Arthur Rimbaud>]
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>>> for author in Author.objects.order_by('name'):
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... print author.name
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Arthur Rimbaud
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Charles Baudelaire
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Gah! We forgot Paul Verlaine. Let's create a formset to edit the existing
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authors with an extra form to add him. We *could* pass in a queryset to
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restrict the Author objects we edit, but in this case we'll use it to display
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them in alphabetical order by name.
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>>> qs = Author.objects.order_by('name')
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>>> AuthorFormSet = modelformset_factory(Author, extra=1, can_delete=False)
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>>> formset = AuthorFormSet(queryset=qs)
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>>> for form in formset.forms:
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... print form.as_p()
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<p><label for="id_form-0-name">Name:</label> <input id="id_form-0-name" type="text" name="form-0-name" value="Arthur Rimbaud" maxlength="100" /><input type="hidden" name="form-0-id" value="2" id="id_form-0-id" /></p>
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<p><label for="id_form-1-name">Name:</label> <input id="id_form-1-name" type="text" name="form-1-name" value="Charles Baudelaire" maxlength="100" /><input type="hidden" name="form-1-id" value="1" id="id_form-1-id" /></p>
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<p><label for="id_form-2-name">Name:</label> <input id="id_form-2-name" type="text" name="form-2-name" maxlength="100" /><input type="hidden" name="form-2-id" id="id_form-2-id" /></p>
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>>> data = {
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... 'form-TOTAL_FORMS': '3', # the number of forms rendered
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... 'form-INITIAL_FORMS': '2', # the number of forms with initial data
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... 'form-0-id': '2',
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... 'form-0-name': 'Arthur Rimbaud',
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... 'form-1-id': '1',
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... 'form-1-name': 'Charles Baudelaire',
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... 'form-2-name': 'Paul Verlaine',
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... }
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>>> formset = AuthorFormSet(data=data, queryset=qs)
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>>> formset.is_valid()
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True
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# Only changed or new objects are returned from formset.save()
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>>> formset.save()
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[<Author: Paul Verlaine>]
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>>> for author in Author.objects.order_by('name'):
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... print author.name
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Arthur Rimbaud
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Charles Baudelaire
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Paul Verlaine
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This probably shouldn't happen, but it will. If an add form was marked for
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deltetion, make sure we don't save that form.
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>>> qs = Author.objects.order_by('name')
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>>> AuthorFormSet = modelformset_factory(Author, extra=1, can_delete=True)
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>>> formset = AuthorFormSet(queryset=qs)
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>>> for form in formset.forms:
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... print form.as_p()
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<p><label for="id_form-0-name">Name:</label> <input id="id_form-0-name" type="text" name="form-0-name" value="Arthur Rimbaud" maxlength="100" /></p>
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<p><label for="id_form-0-DELETE">Delete:</label> <input type="checkbox" name="form-0-DELETE" id="id_form-0-DELETE" /><input type="hidden" name="form-0-id" value="2" id="id_form-0-id" /></p>
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<p><label for="id_form-1-name">Name:</label> <input id="id_form-1-name" type="text" name="form-1-name" value="Charles Baudelaire" maxlength="100" /></p>
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<p><label for="id_form-1-DELETE">Delete:</label> <input type="checkbox" name="form-1-DELETE" id="id_form-1-DELETE" /><input type="hidden" name="form-1-id" value="1" id="id_form-1-id" /></p>
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<p><label for="id_form-2-name">Name:</label> <input id="id_form-2-name" type="text" name="form-2-name" value="Paul Verlaine" maxlength="100" /></p>
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<p><label for="id_form-2-DELETE">Delete:</label> <input type="checkbox" name="form-2-DELETE" id="id_form-2-DELETE" /><input type="hidden" name="form-2-id" value="3" id="id_form-2-id" /></p>
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<p><label for="id_form-3-name">Name:</label> <input id="id_form-3-name" type="text" name="form-3-name" maxlength="100" /></p>
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<p><label for="id_form-3-DELETE">Delete:</label> <input type="checkbox" name="form-3-DELETE" id="id_form-3-DELETE" /><input type="hidden" name="form-3-id" id="id_form-3-id" /></p>
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>>> data = {
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... 'form-TOTAL_FORMS': '4', # the number of forms rendered
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... 'form-INITIAL_FORMS': '3', # the number of forms with initial data
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... 'form-0-id': '2',
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... 'form-0-name': 'Arthur Rimbaud',
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... 'form-1-id': '1',
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... 'form-1-name': 'Charles Baudelaire',
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... 'form-2-id': '3',
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... 'form-2-name': 'Paul Verlaine',
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... 'form-3-name': 'Walt Whitman',
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... 'form-3-DELETE': 'on',
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... }
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>>> formset = AuthorFormSet(data=data, queryset=qs)
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>>> formset.is_valid()
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True
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# No objects were changed or saved so nothing will come back.
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>>> formset.save()
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[]
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>>> for author in Author.objects.order_by('name'):
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... print author.name
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Arthur Rimbaud
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Charles Baudelaire
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Paul Verlaine
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Let's edit a record to ensure save only returns that one record.
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>>> data = {
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... 'form-TOTAL_FORMS': '4', # the number of forms rendered
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... 'form-INITIAL_FORMS': '3', # the number of forms with initial data
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... 'form-0-id': '2',
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... 'form-0-name': 'Walt Whitman',
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... 'form-1-id': '1',
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... 'form-1-name': 'Charles Baudelaire',
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... 'form-2-id': '3',
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... 'form-2-name': 'Paul Verlaine',
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... 'form-3-name': '',
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... 'form-3-DELETE': '',
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... }
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>>> formset = AuthorFormSet(data=data, queryset=qs)
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>>> formset.is_valid()
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True
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# One record has changed.
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>>> formset.save()
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[<Author: Walt Whitman>]
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Test the behavior of commit=False and save_m2m
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>>> meeting = AuthorMeeting.objects.create(created=date.today())
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>>> meeting.authors = Author.objects.all()
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# create an Author instance to add to the meeting.
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>>> new_author = Author.objects.create(name=u'John Steinbeck')
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>>> AuthorMeetingFormSet = modelformset_factory(AuthorMeeting, extra=1, can_delete=True)
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>>> data = {
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... 'form-TOTAL_FORMS': '2', # the number of forms rendered
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... 'form-INITIAL_FORMS': '1', # the number of forms with initial data
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... 'form-0-id': '1',
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... 'form-0-name': '2nd Tuesday of the Week Meeting',
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... 'form-0-authors': [2, 1, 3, 4],
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... 'form-1-name': '',
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... 'form-1-authors': '',
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... 'form-1-DELETE': '',
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... }
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>>> formset = AuthorMeetingFormSet(data=data, queryset=AuthorMeeting.objects.all())
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>>> formset.is_valid()
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True
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>>> instances = formset.save(commit=False)
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>>> for instance in instances:
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... instance.created = date.today()
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... instance.save()
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>>> formset.save_m2m()
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>>> instances[0].authors.all()
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[<Author: Charles Baudelaire>, <Author: John Steinbeck>, <Author: Paul Verlaine>, <Author: Walt Whitman>]
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# delete the author we created to allow later tests to continue working.
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>>> new_author.delete()
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Test the behavior of max_num with model formsets. It should properly limit
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the queryset to reduce the amount of objects being pulled in when not being
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used.
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>>> qs = Author.objects.order_by('name')
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>>> AuthorFormSet = modelformset_factory(Author, max_num=2)
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>>> formset = AuthorFormSet(queryset=qs)
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>>> formset.initial
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[{'id': 1, 'name': u'Charles Baudelaire'}, {'id': 3, 'name': u'Paul Verlaine'}]
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>>> AuthorFormSet = modelformset_factory(Author, max_num=3)
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>>> formset = AuthorFormSet(queryset=qs)
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>>> formset.initial
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[{'id': 1, 'name': u'Charles Baudelaire'}, {'id': 3, 'name': u'Paul Verlaine'}, {'id': 2, 'name': u'Walt Whitman'}]
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# Inline Formsets ############################################################
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We can also create a formset that is tied to a parent model. This is how the
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admin system's edit inline functionality works.
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>>> from django.forms.models import inlineformset_factory
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>>> AuthorBooksFormSet = inlineformset_factory(Author, Book, can_delete=False, extra=3)
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>>> author = Author.objects.get(name='Charles Baudelaire')
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>>> formset = AuthorBooksFormSet(instance=author)
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>>> for form in formset.forms:
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... print form.as_p()
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<p><label for="id_book_set-0-title">Title:</label> <input id="id_book_set-0-title" type="text" name="book_set-0-title" maxlength="100" /><input type="hidden" name="book_set-0-id" id="id_book_set-0-id" /></p>
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<p><label for="id_book_set-1-title">Title:</label> <input id="id_book_set-1-title" type="text" name="book_set-1-title" maxlength="100" /><input type="hidden" name="book_set-1-id" id="id_book_set-1-id" /></p>
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<p><label for="id_book_set-2-title">Title:</label> <input id="id_book_set-2-title" type="text" name="book_set-2-title" maxlength="100" /><input type="hidden" name="book_set-2-id" id="id_book_set-2-id" /></p>
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>>> data = {
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... 'book_set-TOTAL_FORMS': '3', # the number of forms rendered
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... 'book_set-INITIAL_FORMS': '0', # the number of forms with initial data
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... 'book_set-0-title': 'Les Fleurs du Mal',
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... 'book_set-1-title': '',
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... 'book_set-2-title': '',
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... }
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>>> formset = AuthorBooksFormSet(data, instance=author)
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>>> formset.is_valid()
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True
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>>> formset.save()
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[<Book: Les Fleurs du Mal>]
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>>> for book in author.book_set.all():
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... print book.title
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Les Fleurs du Mal
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Now that we've added a book to Charles Baudelaire, let's try adding another
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one. This time though, an edit form will be available for every existing
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book.
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>>> AuthorBooksFormSet = inlineformset_factory(Author, Book, can_delete=False, extra=2)
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>>> author = Author.objects.get(name='Charles Baudelaire')
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>>> formset = AuthorBooksFormSet(instance=author)
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>>> for form in formset.forms:
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... print form.as_p()
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<p><label for="id_book_set-0-title">Title:</label> <input id="id_book_set-0-title" type="text" name="book_set-0-title" value="Les Fleurs du Mal" maxlength="100" /><input type="hidden" name="book_set-0-id" value="1" id="id_book_set-0-id" /></p>
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<p><label for="id_book_set-1-title">Title:</label> <input id="id_book_set-1-title" type="text" name="book_set-1-title" maxlength="100" /><input type="hidden" name="book_set-1-id" id="id_book_set-1-id" /></p>
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<p><label for="id_book_set-2-title">Title:</label> <input id="id_book_set-2-title" type="text" name="book_set-2-title" maxlength="100" /><input type="hidden" name="book_set-2-id" id="id_book_set-2-id" /></p>
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>>> data = {
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... 'book_set-TOTAL_FORMS': '3', # the number of forms rendered
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... 'book_set-INITIAL_FORMS': '1', # the number of forms with initial data
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... 'book_set-0-id': '1',
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... 'book_set-0-title': 'Les Fleurs du Mal',
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... 'book_set-1-title': 'Le Spleen de Paris',
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... 'book_set-2-title': '',
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... }
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>>> formset = AuthorBooksFormSet(data, instance=author)
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>>> formset.is_valid()
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True
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>>> formset.save()
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[<Book: Le Spleen de Paris>]
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As you can see, 'Le Spleen de Paris' is now a book belonging to Charles Baudelaire.
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>>> for book in author.book_set.order_by('title'):
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... print book.title
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Le Spleen de Paris
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Les Fleurs du Mal
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The save_as_new parameter lets you re-associate the data to a new instance.
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This is used in the admin for save_as functionality.
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>>> data = {
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... 'book_set-TOTAL_FORMS': '3', # the number of forms rendered
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... 'book_set-INITIAL_FORMS': '2', # the number of forms with initial data
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... 'book_set-0-id': '1',
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... 'book_set-0-title': 'Les Fleurs du Mal',
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... 'book_set-1-id': '2',
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... 'book_set-1-title': 'Le Spleen de Paris',
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... 'book_set-2-title': '',
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... }
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>>> formset = AuthorBooksFormSet(data, instance=Author(), save_as_new=True)
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>>> formset.is_valid()
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True
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>>> new_author = Author.objects.create(name='Charles Baudelaire')
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>>> formset.instance = new_author
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>>> [book for book in formset.save() if book.author.pk == new_author.pk]
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[<Book: Les Fleurs du Mal>, <Book: Le Spleen de Paris>]
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Test using a custom prefix on an inline formset.
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>>> formset = AuthorBooksFormSet(prefix="test")
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>>> for form in formset.forms:
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... print form.as_p()
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<p><label for="id_test-0-title">Title:</label> <input id="id_test-0-title" type="text" name="test-0-title" maxlength="100" /><input type="hidden" name="test-0-id" id="id_test-0-id" /></p>
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<p><label for="id_test-1-title">Title:</label> <input id="id_test-1-title" type="text" name="test-1-title" maxlength="100" /><input type="hidden" name="test-1-id" id="id_test-1-id" /></p>
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"""}
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