[Fixed]-Django encoding problems with path name

Use python_2_unicode_compatible decorator:

from django.utils.encoding import python_2_unicode_compatible, force_text

@python_2_unicode_compatible
class Property (models.Model):
    #...
    city = models.CharField(max_length = 100, choices = CITIES_LIST)
    pdf_file = models.FileField(upload_to = generateUploadPath)

    def __str__(self):
        return force_text(self.pdf_file.path)

    def __unicode__(self):
        return force_text(unicode(self.pdf_file.path))

    def get_file_path(self):
        return force_text(unicode(self.pdf_file.path))