RE: Displaying a custom field (PickledObjectField) in the admin

The short of it is that you should probably subclass the picklefield to add some new validation (basically is_integer_two_tuple_list), and write a custom widget for it that does what you want on the html side. The long of it needs not being written from a phone

-----Mensaje original-----
De: Alphydan
Enviados: 24/10/2012 19:58:29
Asunto: Re: Displaying a custom field (PickledObjectField) in the admin

Hi Tomas & John,

Thank you for your reply. Basically I'm trying to save curves which I
chose to format as:
[[0,0],[1,0],[2,1],[3,1], ... ,[40,0]]

To see what I tried before (models, etc) you can see the stackoverflow
question<http://stackoverflow.com/questions/13034922/storing-a-curve-in-a-django-model-as-manytomany>I asked previously.
Some people there suggested the django-picklefield so I implemented it but
couldn't get the admin to work.
Unfortunately I would eventually need users to put in numbers in a template.

For the moment I'm just saving a TextField and doing some pretty coarse and
inelegant validation + assuming we enter the curves in the admin.

def save(self, *args, **kwargs):
pc = self.my_power_curve
if pc[0]!='[':
pc = 'error. no initial [ --- ' + pc
self.my_power_curve = pc
elif pc[-1] != ']':
pc = 'error. no final ] --- ' + pc
self.my_power_curve = pc
elif pc.count('[') != 42 or pc.count(']') !=42:
pc = 'error. 41 pairs [,] are required or too many brackets ---
' + pc
self.my_power_curve = pc
elif len(pc)>362:
pc = 'error. too many items --- ' + pc
self.my_power_curve = pc
elif pc.count('(') != 0 or pc.count(')') != 0:
pc = 'error. only "[" and "]" brackets allowed --- ' + pc
self.my_power_curve = pc
else:
pass
return super(SomeClass, self).save(*args, **kwargs)


Ideally I would create form with say 41 little fields:
value 1 = [ ]
value 2 = [ ]
value 3 = [ ]
...
value 41 = [ ]

and when the users completes *some of them*, I save it as a string:
"[[0,0],[1,1],[2,3],[10,20],[20,20],[40,0]]"

Eventually I want to retrieve them and calculate things (like area under
the curve or make a graph).

Any ideas are appreciated,

Thank you,
Alvaro

On Wednesday, 24 October 2012 20:14:16 UTC+1, Tomas Neme wrote:
>
> Just by the way, I'm looking at django-picklefield code and README
> https://github.com/gintas/django-picklefield and it says NOTHING about
> a widget, or an admin representation, so.. maybe it's not DESIGNED to
> be shown on the admin? it'd make sense, too, since it's.. well, it can
> be ANYTHING....
>
> On Wed, Oct 24, 2012 at 3:03 PM, Tomas Neme <lacry...@gmail.com<javascript:>>
> wrote:
> > maybe restate the problem, give some more code, show your models, and
> > your admin files, and someone may be able to help a little
> >
> > --
> > "The whole of Japan is pure invention. There is no such country, there
> > are no such people" --Oscar Wilde
> >
> > |_|0|_|
> > |_|_|0|
> > |0|0|0|
> >
> > (\__/)
> > (='.'=)This is Bunny. Copy and paste bunny
> > (")_(") to help him gain world domination.
>
>
>
> --
> "The whole of Japan is pure invention. There is no such country, there
> are no such people" --Oscar Wilde
>
> |_|0|_|
> |_|_|0|
> |0|0|0|
>
> (\__/)
> (='.'=)This is Bunny. Copy and paste bunny
> (")_(") to help him gain world domination.
>

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