On Oct 3, 4:18 pm, "Juanjo Conti" <[EMAIL PROTECTED]> wrote:
> Hi, I used to use a pre 1.0 svn version of Django. There I had this class:
>
> class Foto(models.Model):
> descripcion = models.CharField(max_length=30, blank=True,
> verbose_name=u"descripción")
> imagen = models.ImageField(upload_to='imagenes', verbose_name=u"foto")
> inmueble = models.ForeignKey(Inmueble)
>
> ....
>
> def _save_FIELD_file(self, field, filename, raw_contents, save=True):
> '''
> Se reescribe el metodo de la clase padre para definir el
> nombre de archivo con
> el que se guardará la imagen en el sistema de archivos. Se
> utilizan enteros crecientes.
> '''
> if TESTING:
> field.upload_to = 'tests_dest'
> filename = Foto._cambio_de_nombre(filename)
> raw_contents = Foto._ajustar_tamanio(raw_contents)
> super(Foto, self)._save_FIELD_file(field, filename, raw_contents,
> save)
>
> The _save_FIELD_file method was redefined to change the file name and
> resize it. Now in 1.0 I can rename the filename with a callable to use
> as upload_to ImageField argument:
>
> def _upload_to(instance, filename):
> intancia.imagen. raw_contents = Foto._ajustar_tamanio(raw_contents)
> filename = Foto._cambio_de_nombre(filename)
> if TESTING:
> return os.path.join('tests_dest', filename)
> return os.path.join('imagenes', filename)
>
> but I don't know where I have to put my code to resize the image
> before it gets saved. Can anyone help me?
>
> Thanks,
>
> Juanjo
I have been overriding the save method on the model. I have found
that by the time the save method is called, the file is saved to the
disk already, So I open the original, resize and save to the
thumbnail:
class Picture(models.Model)
name = models.CharField(max_length=200)
original = models.ImageField(upload_to='original')
thumbnail = models.ImageField(upload_to='thumbnail')
def save(self, **kwargs):
orig = Image.open(self.original.path)
name = os.path.basename(self.original.name)
height = int(100 * orig.size[1] / orig.size[0])
thumb = orig.resize((width, height), Image.ANTIALIAS)
thumb_file = tempfile.NamedTemporaryFile('w+b')
resized.save(thumb_file, 'JPEG')
self.thumbnail.save(name, File(thumb_file), False)
thumb_file.close()
super(Picture, self).save(**kwargs)
I have to save the resized image to a temp file because
self.thumbnail.save takes a django.core.files.File object which takes
an python file object in the constructor. I would love to be able to
use an in memory object instead of a temp file, but that isn't in
possible yet.
John
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