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+"""
+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
+"""}