mirror of
https://github.com/django/django.git
synced 2025-10-30 17:16:10 +00:00
a0ef6f6915
git-svn-id: http://code.djangoproject.com/svn/django/trunk@4220 bcc190cf-cafb-0310-a4f2-bffc1f526a37
114 lines
3.5 KiB
Python
114 lines
3.5 KiB
Python
"""
|
|
34. Generating HTML forms from models
|
|
|
|
Django provides shortcuts for creating Form objects from a model class.
|
|
|
|
The function django.newforms.form_for_model() takes a model class and returns
|
|
a Form that is tied to the model. This Form works just like any other Form,
|
|
with one additional method: create(). The create() method creates an instance
|
|
of the model and returns that newly created instance. It saves the instance to
|
|
the database if create(save=True), which is default. If you pass
|
|
create(save=False), then you'll get the object without saving it.
|
|
"""
|
|
|
|
from django.db import models
|
|
|
|
class Category(models.Model):
|
|
name = models.CharField(maxlength=20)
|
|
url = models.CharField('The URL', maxlength=40)
|
|
|
|
def __str__(self):
|
|
return self.name
|
|
|
|
class Article(models.Model):
|
|
headline = models.CharField(maxlength=50)
|
|
pub_date = models.DateTimeField()
|
|
categories = models.ManyToManyField(Category)
|
|
|
|
def __str__(self):
|
|
return self.headline
|
|
|
|
__test__ = {'API_TESTS': """
|
|
>>> from django.newforms import form_for_model, BaseForm
|
|
|
|
>>> Category.objects.all()
|
|
[]
|
|
|
|
>>> CategoryForm = form_for_model(Category)
|
|
>>> f = CategoryForm()
|
|
>>> print f
|
|
<tr><th><label for="id_name">Name:</label></th><td><input id="id_name" type="text" name="name" maxlength="20" /></td></tr>
|
|
<tr><th><label for="id_url">The URL:</label></th><td><input id="id_url" type="text" name="url" maxlength="40" /></td></tr>
|
|
>>> print f.as_ul()
|
|
<li><label for="id_name">Name:</label> <input id="id_name" type="text" name="name" maxlength="20" /></li>
|
|
<li><label for="id_url">The URL:</label> <input id="id_url" type="text" name="url" maxlength="40" /></li>
|
|
>>> print f['name']
|
|
<input id="id_name" type="text" name="name" maxlength="20" />
|
|
|
|
>>> f = CategoryForm(auto_id=False)
|
|
>>> print f.as_ul()
|
|
<li>Name: <input type="text" name="name" maxlength="20" /></li>
|
|
<li>The URL: <input type="text" name="url" maxlength="40" /></li>
|
|
|
|
>>> f = CategoryForm({'name': 'Entertainment', 'url': 'entertainment'})
|
|
>>> f.errors
|
|
{}
|
|
>>> f.clean_data
|
|
{'url': u'entertainment', 'name': u'Entertainment'}
|
|
>>> obj = f.create()
|
|
>>> obj
|
|
<Category: Entertainment>
|
|
>>> Category.objects.all()
|
|
[<Category: Entertainment>]
|
|
|
|
>>> f = CategoryForm({'name': "It's a test", 'url': 'test'})
|
|
>>> f.errors
|
|
{}
|
|
>>> f.clean_data
|
|
{'url': u'test', 'name': u"It's a test"}
|
|
>>> obj = f.create()
|
|
>>> obj
|
|
<Category: It's a test>
|
|
>>> Category.objects.all()
|
|
[<Category: Entertainment>, <Category: It's a test>]
|
|
|
|
>>> f = CategoryForm({'name': 'Third test', 'url': 'third'})
|
|
>>> f.errors
|
|
{}
|
|
>>> f.clean_data
|
|
{'url': u'third', 'name': u'Third test'}
|
|
>>> obj = f.create(save=False)
|
|
>>> obj
|
|
<Category: Third test>
|
|
>>> Category.objects.all()
|
|
[<Category: Entertainment>, <Category: It's a test>]
|
|
>>> obj.save()
|
|
>>> Category.objects.all()
|
|
[<Category: Entertainment>, <Category: It's a test>, <Category: Third test>]
|
|
|
|
>>> f = CategoryForm({'name': '', 'url': 'foo'})
|
|
>>> f.errors
|
|
{'name': [u'This field is required.']}
|
|
>>> f.clean_data
|
|
>>> f.create()
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: The Category could not be created because the data didn't validate.
|
|
|
|
>>> f = CategoryForm({'name': '', 'url': 'foo'})
|
|
>>> f.create()
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: The Category could not be created because the data didn't validate.
|
|
|
|
You can pass a custom Form class to form_for_model. Make sure it's a
|
|
subclass of BaseForm, not Form.
|
|
>>> class CustomForm(BaseForm):
|
|
... def say_hello(self):
|
|
... print 'hello'
|
|
>>> CategoryForm = form_for_model(Category, form=CustomForm)
|
|
>>> f = CategoryForm()
|
|
>>> f.say_hello()
|
|
hello
|
|
"""}
|