Django admin TabularInline - is there a good way o

Question

I've got a model (Entry) which contains a simple property:

@property
def image(self):
        return str(self.id)+"_"+self.round.season.name+"_"+self.round.theme+"_"+self.person.name

I use this to build the name of a particular image file on disk. So I know that there's going to be an image at /path/to/images/(model.image()).jpg

I can display the raw image property itself within the TabularInline layout on an admin page by adding it to the readonly_fields collection, but how would I go about getting a column which had custom html wrapped around the model property?

e.g.

<img src="/images/{{model.image}}.jpg" />

Answer 1

According to current Django 1.2+ I got errors "Form does not have such field as render_image". Solution is simple put the render_image function into model.Admin not in your inline form, second thing is fields and readonly_fields settings in your Inline form... So here You have what I've ended up with:

class OfferPropertyInline(admin.TabularInline):
    model = OfferProperty
    fields=('property_value',)
    readonly_fields = ('property_value',)

class OfferAdmin(admin.ModelAdmin):
    inlines = [
        OfferPropertyInline
    ]

    def property_value(self,obj):
        return obj.get_value()

admin.site.register(Offer, OfferAdmin)

Answer 2

@lechup correct except you need:

readonly_fields = ('mycustomfield',)

defined in the Inline for later versions of django (+1.4)

Answer 3

What you can do is create a method in your TabularInline subclass that returns the HTML you want, then use that method's name in place of image in ImageInline.fields:

from django.utils.safestring import mark_safe

class ImageInline(admin.TabularInline):
    ...
    fields = (..., 'render_image')

    def render_image(self, obj):
        return mark_safe("""<img src="/images/%s.jpg" />""" % obj.image)

Answer 4

Lechup's answer does not work for me, I am using Django 1.11.7. I found this way to work around.

Let say I have 2 tables: Campaign and Article, one campaign has many articles. I want to show the articles when browsing a specific campaign.

Table Article has a column named score, which is a float. I want to round it up to 2 decimal places when viewing in Django admin.

This example shows how you can make a custom column for TabularInline in Django admin.

class Article(models.Model):
    title = models.TextField(null=False)
    url = models.TextField()        
    score = models.FloatField(null=True)

    def __str__(self):
        return self.title

    def display_score(self):
        if self.score:
            return round(self.score, 2)
        return self.score

    display_score.short_description = 'Score'

class ArticleInline(admin.TabularInline):
    model = Article
    readonly_fields = ('title', 'url', 'display_score')
    fields = ('title', 'url', 'display_score')

class CampaignAdmin(admin.ModelAdmin):
    inlines = [ArticleInline]

admin.site.register(Campaign, CampaignAdmin)