from posixpath import exists

from cms.models import CMSPlugin
from django.db import models
from django.utils.translation import ugettext_lazy as _
from filer.fields.file import FilerFileField

from cmsplugin_filer_utils import FilerPluginManager


class FilerFile(CMSPlugin):
    """
    Plugin for storing any type of file.

    Default template displays download link with icon (if available) and file size.

    This could be updated to use the mimetypes library to determine the type of file rather than
    storing a separate icon for each different extension.

    The icon search is currently performed within get_icon_url; this is probably a performance concern.
    """
    title = models.CharField(_("title"), max_length=255, null=True, blank=True)
    file = FilerFileField(verbose_name=_('file'))
    target_blank = models.BooleanField(_('Open link in new window'), default=False)

    objects = FilerPluginManager(select_related=('file',))

    def get_icon_url(self):
        return self.file.icons['32']

    def file_exists(self):
        return exists(self.file.path)

    def get_file_name(self):
        return self.file.name

    def get_ext(self):
        return self.file.extension

    def __unicode__(self):
        if self.title:
            return self.title
        elif self.file:
            # added if, because it raised attribute error when file wasnt defined
            return self.get_file_name()
        return "<empty>"

    search_fields = ('title',)

from cms.models import CMSPlugin
from django.db import models
from django.utils.translation import ugettext_lazy as _
from filer.fields.file import FilerFileField

from cmsplugin_filer_utils import FilerPluginManager


class FilerFile(CMSPlugin):
    """
    Plugin for storing any type of file.

    Default template displays download link with icon (if available) and file size.

    This could be updated to use the mimetypes library to determine the type of file rather than
    storing a separate icon for each different extension.

    The icon search is currently performed within get_icon_url; this is probably a performance concern.
    """
    title = models.CharField(_("title"), max_length=255, null=True, blank=True)
    file = FilerFileField(verbose_name=_('file'))
    target_blank = models.BooleanField(_('Open link in new window'), default=False)

    objects = FilerPluginManager(select_related=('file',))

    def get_icon_url(self):
        return self.file.icons['32']

    def file_exists(self):
        return self.file.file.storage.exists(self.file.path)

    def get_file_name(self):
        if self.file.name in ('', None):
            name = u"%s" % (self.file.original_filename,)
        else:
            name = u"%s" % (self.file.name,)
        return name

    def get_ext(self):
        return self.file.extension

    def __unicode__(self):
        if self.title:
            return self.title
        elif self.file:
            # added if, because it raised attribute error when file wasnt defined
            return self.get_file_name()
        return "<empty>"

    search_fields = ('title',)

Use the file's storage to determine whether the file exists or not. The existing implementation that uses posixpath.exists only works if the storage backend is the default FileSystemStorage
Use the file's storage to determine whether the file exists or not.
The existing implementation that uses posixpath.exists only works if the storage backend is the default FileSystemStorage
