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"

Answer 2

file_ is a function in your model. You can only show fields in a fieldset. A valid field would be file itself, but not the function file_.

I would also construct the HTML in your template and not in your model (I am not even sure if this is working what you have done so far).

Assuming you pass the object event with your view to your template. So you can use in your HTML template file:

{% if event.file %}
    <a href="{{ event.file.url }}">Download</a>
{% else %}
    No attachment
{% endif %}