Pre-filling fields in create view

It would be nice to be able to pre-configure the create_view endpoint by passing in GET parameters to it.

So this URL: http://mysite.dev/admin/productsku/?size=2&variant=3&season=1&season=2&ean_code=123456789 Would produce something like this:

[crzyhorse]

Since it seems that neither a code sample or a recipe section were added for this, and since I struggled with this, I thought I would post my solution.

class MyModelView(ModelView):
     # override create form, not get_create_form as mentioned above. 
     def create_form(self):
         form = super(MyModelView, self).create_form()
         if ('variant') in request.args.keys():
             variant_query = self.session.query(Variant).filter(Variant.id = request.args['variant']).one()
             form.variant.query = [variant_query]
        if ('size') in request.args.keys():
             size_query = self.session.query(Size).filter(Size.id = request.args['size']).one()
             form.size.query = [size_query]
        return form 

Also, I’m using this to create action buttons to create entries for another view, with references to the previous view selected by default. If worried about non-safe values, just validate that the request arguments are in acceptable range before using them.

[jlelong]

For anyone coming here, I had to tweak https://github.com/flask-admin/flask-admin/issues/1051#issuecomment-372010195 a bit to make it work as updating the form data fails

class FilteredImageURLView(CustomModelView):
    """Custom view for Tag model."""

    def create_form(self):
        ImageUrl = models.ImageURL
        if ('img_id') in request.args.keys():
            img_url_m = self.session.query(ImageUrl).filter(ImageUrl.id == request.args['img_id']).one()  # NOQA
            return super(imageURL).create_form(image_url_m)
        return super(imageURL).create_form()