I have install a fresh wagtail when I try to create a page I'm getting error :

'NoneType' object has no attribute 'model'

My class is :

class CategoryPage(Page):
    
    description_meta = models.CharField(max_length=500, null=True, blank=True)
    template = models.CharField(max_length=500, null=True, blank=True, default='_nixaTemplate/category/default.html')
    image = models.ImageField(_("Image"), upload_to="img/category/", blank=True, null=True)
    display = models.BooleanField(_("Display Post"), default=False )

    content_panels = Page.content_panels   [
        FieldRowPanel([
            FieldPanel("description_meta", classname="col-12 col12"),
            FieldPanel("template", classname="col-12 col12"),
            ImageChooserPanel("image", classname="full"),
        ]),
    ]

when I try to create Category Page I get that message

CodePudding user response：

ImageChooserPanel needs to be used with a ForeignKey to the Image model, not an ImageField. This is because Django's ImageField field type just provides a plain file upload, but in Wagtail images are database objects in their own right that can be re-used, given titles, organised into collections and so on.

class CategoryPage(Page):
    description_meta = models.CharField(max_length=500, null=True, blank=True)
    template = models.CharField(max_length=500, null=True, blank=True, default='_nixaTemplate/category/default.html')
    image = models.ForeignKey(("wagtailimages.Image"), blank=True, null=True, on_delete=models.SET_NULL)
    display = models.BooleanField(_("Display Post"), default=False )

    content_panels = Page.content_panels   [
        FieldRowPanel([
            FieldPanel("description_meta", classname="col-12 col12"),
            FieldPanel("template", classname="col-12 col12"),
            ImageChooserPanel("image", classname="full"),
        ]),
    ]

Alternatively, if you just want a plain file upload field here, you can use FieldPanel instead of ImageChooserPanel, but then the images will exist outside of the Wagtail image library and the standard image functionality (such as the {% image %} template tag) won't be usable for them.