Retrieve field values to Django Admin using many to many relationships - django

Question

I have a simple task: I need to expose player name related to Game in game list (Django Admin). Game object has ManyToMany relationship with Player object via 'players' attribute. The problem is that now I have empty 'players_list' field (empty list means I don't know what to do and just leave it here[enter image description here][1]), though I tried Player.objects.all() and obviously got all players even those who are not bound to particular game.
I feel it has simple solution but my brain refuses to work after 55 opened tabs.
Thanks in advance!
This is my models.py
from django.db import model
class Player(models.Model):
name = models.CharField(max_length=54, default="")
email = models.EmailField(max_length=54)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
def __str__(self):
return self.name
class Game(models.Model):
name = models.CharField(max_length=254, default="")
players = models.ManyToManyField(Player, blank=True, related_name='player_games')
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
players_list = []
def __str__(self):
return self.name
and admin.py
from django.contrib import admin
from .models import Game, Player
class PlayerInline(admin.TabularInline):
model = Game.players.through
#admin.register(Player)
class Admin(admin.ModelAdmin):
search_fields = ['name', 'email']
list_display = ('name', 'email', 'created_at', 'updated_at')
inlines = [
PlayerInline,
]
#admin.register(Game)
class AdminAdmin(admin.ModelAdmin):
list_display = ('name', 'created_at', 'updated_at', 'players_list')
inlines = [
PlayerInline,
]
exclude = ('players',)
Pic as it looks now
[1]: https://i.stack.imgur.com/KVJ5y.png

Answer 1

The best approach here will be creating custom method in your model instead of single variable. You will not even have to change your list_display:
class Game(models.Model):
...
def players_list(self):
return self.players.all()
Alternatively, if you want only names of players or anything else from, you can change it (or add another method) to something like that:
class Game(models.Model):
...
def players_list(self):
return [player for player in self.players.all()]
# or
return [player.name for player in self.players.all()]
This is called list comprehension, if you are not familiar with it.