list_display of the model with foreign key - django

Question

I have the following django model.
In the django admin model of TestCase table, in its list_display, i want to display the most recent comment and the modifier name of Remark table.
models.py
from django.db import models
class Release(models.Model):
title = models.CharField(max_length=128)
start_time = models.DateField('Release Start Date')
release_date = models.DateField('Release Ended Date')
def __str__(self):
return self.title
class TestCase(models.Model):
query = models.CharField(max_length=256)
ksq_id = models.IntegerField()
status = models.CharField(max_length=64)
release = models.ForeignKey(Release) # Release can have many test cases
def __str__(self):
return self.query
class Remark(models.Model):
owner = models.CharField(max_length=64)
module = models.CharField(max_length=64)
comment = models.CharField(max_length=1024)
modified_ts = models.DateTimeField('date modified', auto_now=True)
modifier = models.CharField(max_length=64)
testcase = models.ForeignKey(TestCase) # Testcase can have many Re
admin.py
from django.contrib import admin
from kramer_release.models import Release, TestCase, Remark
class RemarksInline(admin.TabularInline):
model = Remark
extra = 0
class RemarkAdmin(admin.ModelAdmin):
list_display = ('owner', 'module', 'testcase_query')
def testcase_query(self, obj):
return obj.testcase.query
class TestCaseAdmin(admin.ModelAdmin):
inlines = [RemarksInline]
list_display = ('query', 'status')
admin.site.register(Release)
admin.site.register(TestCase, TestCaseAdmin)
admin.site.register(Remark, RemarkAdmin)

Answer 1

You can defined a function to get the latest comment as part of you admin class, something like:
class TestCaseAdmin(admin.ModelAdmin):
inlines = [RemarksInline]
list_display = ('query', 'status', 'latest_comment')
def latest_comment(self, obj):
remarks = Remark.objects.filter(testcase=obj).order_by('-modified_ts')
if remarks:
return '%s - %s' % (remarks[0].comment, remarks[0].modifier)
return None
see the docs