I did not know the pickle module. This is interesting. Thanks.
However, after playing with it, I am not sure it fits totally my need
because I'd like humans to be able to write a string like
"modulea.moduleb.MyClass" in the admin or so.
So I kept trying making a custom field (instead of a Model) by creating a
custom
field, formfield and widget.
The list view works well, even though it displays <class
'modulea.moduleb.MyClass'> instead of modulea.moduleb.MyClass...
The add page works as well, I can add a model with the value "
modulea.moduleb.MyClass" in the field and then it works.
BUT I have an issue with the detail page of a model.
I get a TypeError because my field has a class reference (which is
callable) and the code below then instances it!
-
c:\Users\Mike\Dropbox\development\tools\virtualenvs\django-1.4\lib\site-packages\django\forms\forms.py
in as_widget
1.
else:
2.
attrs['id'] = self.html_initial_id
3.
4.
if not only_initial:
5.
name = self.html_name
6.
else:
7.
name = self.html_initial_name
1.
return widget.render(name, self.value(), attrs=attrs)
...
1.
2.
def as_text(self, attrs=None, **kwargs):
3.
"""
4.
Returns a string of HTML for representing this as an <input
type="text">.
5.
"""
6.
return self.as_widget(TextInput(), attrs, **kwargs)
▼ Local vars <http://127.0.0.1:8000/admin/xmlmapping/mapping/3/#>
VariableValueauto_id
u'id_mapper_class'
widget
<xmlmapping.fieldsbis.PickleWidget object at 0x05B13290>
name
'mapper_class'
self
<django.forms.forms.BoundField object at 0x05B1A9F0>
only_initial
False
attrs
{'id': u'id_mapper_class'}
-
c:\Users\Mike\Dropbox\development\tools\virtualenvs\django-1.4\lib\site-packages\django\forms\forms.py
in value
1.
"""
2.
Returns the value for this BoundField, using the initial value if
3.
the form is not bound or the data otherwise.
4.
"""
5.
if not self.form.is_bound:
6.
data = self.form.initial.get(self.name, self.field.initial)
7.
if callable(data):
1.
data = data()
...
1.
else:
2.
data = self.field.bound_data(
3.
self.data, self.form.initial.get(self.name,
self.field.initial)
4.
)
5.
return self.field.prepare_value(data)
6.
▼ Local vars <http://127.0.0.1:8000/admin/xmlmapping/mapping/3/#>
VariableValueself
<django.forms.forms.BoundField object at 0x05B1A9F0>
data
<class 'xmlmapping.mappers.MapperWithNoLog'>
-
I overrided the render method of the widget but the errors comes from
self.value() of the BoundField.
How can I fix that? override that?
Any other idea?
Thanks.
Le jeudi 23 août 2012 03:27:09 UTC+2, Melvyn Sopacua a écrit :
>
> On 23-8-2012 0:37, Michael Palumbo wrote:
> > ok thanks, so you'd rather do it with a Model than a custom field.
> > I actually started to make a custom field but I had a few issues while
> > displaying it in the admin so that's why I asked the question then.
>
> You can pickle an object and store the result in a blob-type field or
> encode it and put it in a TextArea field:
> <http://docs.python.org/library/pickle.html#pickle>
> It's basically what the session module is doing. Perhaps look there for
> inspiration:
> <
> https://docs.djangoproject.com/en/1.4/topics/http/sessions/#technical-details>
>
>
>
> --
> Melvyn Sopacua
>
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