Code: Alles auswählen
def serialize(data):
return simplejson.dumps(data, sort_keys=True, indent=4)
def deserialize(stream):
return simplejson.loads(stream)
class DictFormWidget(forms.Textarea):
""" form widget for preferences dict """
def render(self, name, value, attrs=None):
"""
FIXME: Can we get the original non-serialized db value here?
"""
value = serialize(value)
return super(DictFormWidget, self).render(name, value, attrs)
class DictFormField(forms.CharField):
""" form field for preferences dict """
widget = DictFormWidget
def clean(self, value):
"""
validate the form data
FIXME: How can we get the pref form class for validating???
"""
value = super(DictFormField, self).clean(value)
try:
return deserialize(value)
except Exception, err:
raise forms.ValidationError("Can't deserialize: %s" % err)
class DictField(models.TextField):
"""
A dict field.
Stores a python dict into a text field.
"""
__metaclass__ = models.SubfieldBase
def to_python(self, value):
""" decode the data dict using simplejson.loads() """
if isinstance(value, dict):
return value
return deserialize(value)
def get_db_prep_save(self, value):
"Returns field's value prepared for saving into a database."
assert isinstance(value, dict)
return serialize(value)
def formfield(self, **kwargs):
# Always use own form field and widget:
kwargs['form_class'] = DictFormField
kwargs['widget'] = DictFormWidget
return super(DictField, self).formfield(**kwargs)Ich Frage mich wie ich im form field und im widget Zugriff auf die model instance haben kann?
EDIT: btw. Natürlich könnte man auch andere datentypen die json kann nehmen. Ich brauche aber nur dict...
EDIT2: Hier noch ein ähnliches Beispiel: http://trac.pylucid.net/browser/branche ... y?rev=1906