Source code for django_tables2.columns.filecolumn

# coding: utf-8
from __future__ import absolute_import, unicode_literals

import os

from django.db import models
from django.utils.html import format_html

from django_tables2.utils import AttributeDict

from .base import Column, library


@library.register
[docs]class FileColumn(Column): """ 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:: <a href="/media/path/to/receipt.pdf" title="path/to/receipt.pdf">receipt.pdf</a> When unable to determine the URL, a ``span`` is used instead:: <span title="path/to/receipt.pdf">receipt.pdf</span> `.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. """ def __init__(self, verify_exists=True, **kwargs): self.verify_exists = True super(FileColumn, self).__init__(**kwargs) def render(self, value): storage = getattr(value, 'storage', None) exists = None url = None if storage: # we'll assume value is a `django.db.models.fields.files.FieldFile` if self.verify_exists: exists = storage.exists(value.name) url = storage.url(value.name) else: if self.verify_exists and hasattr(value, 'name'): # ignore negatives, perhaps the file has a name but it doesn't # represent a local path... better to stay neutral than give a # false negative. exists = os.path.exists(value.name) or exists tag = 'a' if url else 'span' attrs = AttributeDict(self.attrs.get(tag, {})) attrs['title'] = value.name if url: attrs['href'] = url classes = [c for c in attrs.get('class', '').split(' ') if c] if exists is not None: classes.append('exists' if exists else 'missing') attrs['class'] = ' '.join(classes) return format_html( '<{tag} {attrs}>{text}</{tag}>', tag=tag, attrs=attrs.as_html(), text=os.path.basename(value.name) ) @classmethod def from_field(cls, field): if isinstance(field, models.FileField): return cls(verbose_name=field.verbose_name)