Django : how to upload a file in admin

Question

I try to create a link to download a file in the admin but it does not work

my model

class Event(models.Model):
    ......
    file = models.FileField(_('fichier'), upload_to='medias',  null=True,  blank=True)

    def file_(self):
        if self.file:
            return "<a href='%s'>download</a>" % (self.file.url,)
        else:
            return "No attachment"

my admin :

class EventAdmin(admin.ModelAdmin):

list_display = ('title', 'start', 'end', 'user', 'fin', 'frequency', 'file_',)


fieldsets = (
    (None, {
        'fields': ('title','start', 'end', 'is_cancelled', 'calendar', 'user', 'description', ('frequency', 'fin' ), 'activated', 'file_',)
    }),

I get the error :

Exception Value:

'EventAdmin.fieldsets[0][1]['fields']' refers to field 'file_' that is missing from the form.

what is this problem ?

Answer 1

You should define your admin like this:

class EventAdmin(admin.ModelAdmin):

    list_display = ('title', 'start', 'end', 'user', 'fin', 'frequency', 'file_link',)


    fieldsets = (
    (None, {
        'fields': ('title','start', 'end', 'is_cancelled', 'calendar', 'user', 'description', ('frequency', 'fin' ), 'activated', 'file',)
    }),

    def file_link(self, obj):
        if obj.file:
            return "<a href='%s'>download</a>" % (obj.file.url,)
        else:
            return "No attachment"