105 lines
3.2 KiB
Python
105 lines
3.2 KiB
Python
"""
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34. Generating HTML forms from models
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Django provides shortcuts for creating Form objects from a model class.
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The function django.newforms.form_for_model() takes a model class and returns
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a Form that is tied to the model. This Form works just like any other Form,
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with one additional method: create(). The create() method creates an instance
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of the model and returns that newly created instance. It saves the instance to
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the database if create(save=True), which is default. If you pass
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create(save=False), then you'll get the object without saving it.
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"""
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from django.db import models
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class Category(models.Model):
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name = models.CharField(maxlength=20)
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url = models.CharField('The URL', maxlength=40)
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def __str__(self):
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return self.name
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class Article(models.Model):
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headline = models.CharField(maxlength=50)
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pub_date = models.DateTimeField()
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categories = models.ManyToManyField(Category)
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def __str__(self):
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return self.headline
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__test__ = {'API_TESTS': """
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>>> from django.newforms import form_for_model
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>>> Category.objects.all()
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[]
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>>> CategoryForm = form_for_model(Category)
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>>> f = CategoryForm()
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>>> print f
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<tr><th><label for="id_name">Name:</label></th><td><input id="id_name" type="text" name="name" maxlength="20" /></td></tr>
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<tr><th><label for="id_url">The URL:</label></th><td><input id="id_url" type="text" name="url" maxlength="40" /></td></tr>
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>>> print f.as_ul()
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<li><label for="id_name">Name:</label> <input id="id_name" type="text" name="name" maxlength="20" /></li>
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<li><label for="id_url">The URL:</label> <input id="id_url" type="text" name="url" maxlength="40" /></li>
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>>> print f['name']
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<input id="id_name" type="text" name="name" maxlength="20" />
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>>> f = CategoryForm(auto_id=False)
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>>> print f.as_ul()
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<li>Name: <input type="text" name="name" maxlength="20" /></li>
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<li>The URL: <input type="text" name="url" maxlength="40" /></li>
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>>> f = CategoryForm({'name': 'Entertainment', 'url': 'entertainment'})
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>>> f.errors
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{}
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>>> f.clean_data
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{'url': u'entertainment', 'name': u'Entertainment'}
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>>> obj = f.create()
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>>> obj
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<Category: Entertainment>
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>>> Category.objects.all()
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[<Category: Entertainment>]
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>>> f = CategoryForm({'name': "It's a test", 'url': 'test'})
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>>> f.errors
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{}
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>>> f.clean_data
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{'url': u'test', 'name': u"It's a test"}
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>>> obj = f.create()
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>>> obj
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<Category: It's a test>
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>>> Category.objects.all()
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[<Category: Entertainment>, <Category: It's a test>]
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>>> f = CategoryForm({'name': 'Third test', 'url': 'third'})
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>>> f.errors
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{}
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>>> f.clean_data
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{'url': u'third', 'name': u'Third test'}
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>>> obj = f.create(save=False)
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>>> obj
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<Category: Third test>
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>>> Category.objects.all()
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[<Category: Entertainment>, <Category: It's a test>]
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>>> obj.save()
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>>> Category.objects.all()
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[<Category: Entertainment>, <Category: It's a test>, <Category: Third test>]
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>>> f = CategoryForm({'name': '', 'url': 'foo'})
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>>> f.errors
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{'name': [u'This field is required.']}
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>>> f.clean_data
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>>> f.create()
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Traceback (most recent call last):
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...
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ValueError: The Category could not be created because the data didn't validate.
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>>> f = CategoryForm({'name': '', 'url': 'foo'})
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>>> f.create()
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Traceback (most recent call last):
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...
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ValueError: The Category could not be created because the data didn't validate.
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"""}
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