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FileColumna
Attempts to render `.FieldFile` (or other storage backend `.File`) as a
hyperlink.
When the file is accessible via a URL, the file is rendered as a
hyperlink. The `.basename` is used as the text::
receipt.pdf
When unable to determine the URL, a ``span`` is used instead::
receipt.pdf
`.Column.attrs` keys ``a`` and ``span`` can be used to add additional attributes.
Arguments:
verify_exists (bool): attempt to determine if the file exists
If *verify_exists*, the HTML class ``exists`` or ``missing`` is
added to the element to indicate the integrity of the storage.
text (str or callable): Either static text, or a callable. If set, this
will be used to render the text inside the link instead of
the file's basename (default)
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