Displaying a custom field (PickledObjectField) in the admin

[John DeRosa]

Hello Djangonauts,

I'm doing something wrong, but I just can't see it!

My problem is that a custom model field isn't being displayed in the Admin interface.

I'm running OS X 10.6.3, Python 2.6, and Django 1.1.1. I installed django-picklefield 0.1.5 from PyPi, and I'm trying to use it in a database model. I defined a couple of custom PickledObjectField fields. They show up in the Admin model docs as being of type "Text", but they *don't* show up in the Admin when I add or change a row.

Here's what I'm doing. What am I doing wrong?

John

------------------

In models.py:

from picklefield.fields import PickledObjectField

class LayoutTemplate(models.Model):

    [snip]

    attachment_points = PickledObjectField(help_text="A list of TemplateAttachmentPoints")

    placed_objects = PickledObjectField(blank=True,

                                        help_text="A list of objects placed on this template")

    # These LayoutObjects are allowed on this template.

    allowed_objects = PickledObjectField(help_text="A list of allowed objects.")

    def __unicode__(self):

        return u"%s" % self.name

In admin.py:

from hosted.models import LayoutTemplate

from django.contrib import admin

admin.site.register(LayoutTemplate)

[John DeRosa]

Nope, I didn't find a solution. I moved on to another issue and never got back to this. We just learned to work around this, I'm semi-ashamed to say.

John

On Oct 23, 2012, at 2:29 PM, Alphydan <alph...@gmail.com> wrote:

I have the same problem (on ubuntu, python 2.7, django 1.4, django-picklefield 0.2.1) ... does anybody have any insight?
John, did you find a solution?

Thank you.

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[Tomas Neme]

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.

[Tomas Neme]

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....

[Alphydan]

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 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

[lacry...@gmail.com]

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.

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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[Paul]

If you just want to see (read) the contents you could do this:

class Example(models.Model):

value = PickledObjectField()

def value_unpacked(self):

return u'{value}'.format(value=self.value)

filter_link.allow_tags = True

class ExampleAdmin(admin.ModelAdmin):

    list_display = ('id', 'value_unpacked',)

 

Actually modifying it is obviously more difficult as it can be ... anything indeed

Paul