Adding data in FK'd models through admin

Note: Detailed explanation below, this is somewhat similar to #138, explained in ‘footnote’ section.

I’m having an issue restructuring my models and have a feeling that I’m bending wagtail to do something its not meant to, at the same time this is somewhat standard while working in Django .

I want:

• to add categories of a product via the admin panel in a table ‘Category’/
• ProductPage(Page) to FK’s to a Category
• In the Product Page admin, I would like to pick (and preferably add) a category for the product.

This is straightforward with the Django stock admin, but I can’t seem to figure out how to get it to work here.

A quick and dirty example of e-commerce models (with problems mentioned):

An implementation I would have thought would work:

class Category(models.Model):
    '''
    Each Product will be associated with one Category.
    '''
    name = models.CharField(max_length = 100)
    description = models.TextField()

    def __unicode__(self):
        return u"%s" % (self.name)

class ProductPage(Page):
    product_name = RichTextField()
    product_description = RichTextField()
    category = models.ForeignKey('CategoryPage', to_field='category_name', related_name='+')
    price = models.IntegerField(default=0)
    qty_in_stock = models.IntegerField(default=0)

ProductPage.content_panels = [
    FieldPanel('title', classname="Page Title"),
    FieldPanel('product_name', classname="Product Name"),
    FieldPanel('product_description', classname="Product Description"),
    FieldPanel('category', classname="Category Name"),
    FieldPanel('price'),
    FieldPanel('qty_in_stock'),
]

While I can pick a category, there is no way to add one (through the admin).

What I’m finally doing (still some problems mentioned at the end).

class CategoryPage(Page):
    category_name = RichTextField("Category Name", unique=True)
    category_description =  RichTextField("Category Description")

CategoryPage.content_panels = [
    FieldPanel('category_name', classname="Category Name"),
    FieldPanel('category_description', classname="Category Description"),
]

class ProductPage(CategoryPage): # since I'm inheriting CategoryPage, I'm inheriting the content_panels as well
    product_name = RichTextField()
    product_description = RichTextField()
    category = models.ForeignKey('CategoryPage', to_field='category_name', related_name='+') # if I remove this I lose the dropdown
    price = models.IntegerField(default=0)
    qty_in_stock = models.IntegerField(default=0)

ProductPage.content_panels = [
    FieldPanel('title', classname="Page Title"),
    FieldPanel('product_name', classname="Product Name"),
    FieldPanel('product_description', classname="Product Description"),
    FieldPanel('category', classname="Category Name"), # if I remove this I lose the dropdown
    FieldPanel('price'),
    FieldPanel('qty_in_stock'),
]

I have tried a couple of things of other (maybe silly) things, one of which is adding: python CategoryPage.content_panels = [] above python ProductPage.content_panels =[ foo bar ] in the ProductPage model.

Can anyone shed any light on this?

---

As for #138: The solution suggested by @gasman was to add categories of a menu as subpages of MenuPage. Translating this to my scenario, this means that each ProductPage will be linked to one (or more) categories, however, I could not figure out how to pick categories that already existed in the admin. A guess - would this entail adding an admin action? Or am I off the mark completely here?

[gasman]

@tutuca The original issue here was not about adding new items from a popup, and was already closed before people started talking about that…

It looks like this feature request is covered by #396 - I suggest that any further discussion towards implementing this feature should happen there.

[codydjango]

I’d just like to clarify that this isn’t an issue with wagtailmodeladmin, AFAIK, which seems to use the same foreignkey field and widget as wagtail. I’m just curious if there’s a reason why the functionality isn’t present in wagtail. The “expected” functionality (coming from django stock admin or mezzanine) is a little + button next to the select element which then pops open a modal in which you can create the object you’d like to add via a form. Once submitting the form the modal vanishes and the newly created id is selected in the foreignkey select element. I hope this makes sense 😃

I’ll take a deeper look this weekend, I might be able to get it working on a fork.