Footnote make Page and UUID unique together

[CamLamb]

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[CamLamb]

TODO:

• Add validation to check that UUIDs stored in the page reference related footnotes that exist

[CamLamb]

Current thoughts on validation:

I was thinking something like this on the RichTextBlockWithFootnotes class:

class RichTextBlockWithFootnotes(RichTextBlock):
    ...
    def clean(self, value):
        cleaned_data = super().clean(value)
        page = {} # Not sure how to get the page from here...
        footnote_uuids = []

        def add_uuid(match):
            footnote_uuids.append(match.group(1))
        FIND_FOOTNOTE_TAG.sub(add_uuid, str(value))

        for footnote_uuid in footnote_uuids:
            if not page.footnotes.filter(uuid=footnote_uuid).exists():
                raise ValidationError(f"Invalid footnote reference {footnote_uuid}")
        return cleaned_data

but I couldn't work out how to get the page (I'm not convinced this is possible).

Open to suggestions/ideas

[CamLamb]

I am splitting the Validation logic out into its own issue to be dealt with separately as I think it needs a little more thought.
See: #17