pto.admin.py

from django.contrib import admin
from django.contrib.auth.models import User
from pto.models import Request, Holiday

class HolidayAdmin(admin.ModelAdmin):
    list_display = ('name', 'start_date')
    list_display_links = ('name',)

class RequestAdmin(admin.ModelAdmin):
    list_display = ('employee', 'start_date', 'end_date')
    exclude = ('created_by',)

    def save_model(self, request, obj, form, change):
        obj.created_by = request.user
        obj.save()

    # TODO: This may require custom validation for security
    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if db_field.name == "employee":
            kwargs["queryset"] = User.objects.filter(pk__in=([request.user.pk] + [i['user_id'] for i in request.user.reports.all().values()]))
        return super(RequestAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs)

#    def has_change_permission(self, request, obj=None):
#        from pprint import pprint; import IPython; IPython.Shell.IPShellEmbed(argv=[])()


#    class Media:
#        js = ("my_code.js",)

admin.site.register(Request, RequestAdmin)
admin.site.register(Holiday, HolidayAdmin)

pto.models.py

from datetime import datetime
from django.db import models
from django.contrib.auth.models import User

class Request(models.Model):
    TYPE_CHOICES = (
        ('T', 'timeoff'),
        ('S', 'sick'),
        ('B', 'bereavement'),
    )
    STATUS_CHOICES = (
        ('P', 'pending'),
        ('C', 'canceled'),
        ('D', 'denied'),
        ('A', 'approved'),
        ('C', 'completed'),
        ('R', 'correction requested'),
        ('auto generated', (
                ('-', 'decreased'),
                ('+', 'increased'),
                ('^', 'adjusted'),
                ('$', 'compensated'),
            )
        )
    )

    employee = models.ForeignKey(User, related_name='pto_requests', default='request.user')
    created_by = models.ForeignKey(User, related_name='pto_requests_created')
    type = models.CharField(max_length=1, choices=TYPE_CHOICES, default='T')
    start_date = models.DateTimeField(default=datetime.combine(datetime.today(), datetime.min.time()))
    end_date = models.DateTimeField(default=datetime.combine(datetime.today(), datetime.max.time()))
    days_requested = models.DecimalField(max_digits=5, decimal_places=2)
    status = models.CharField(max_length=1, choices=STATUS_CHOICES, default='P')
    created_date = models.DateTimeField(auto_now_add=True)
    modified_date = models.DateTimeField(auto_now=True)
    comment = models.TextField(blank=True)

class Holiday(models.Model):
    name = models.CharField(max_length=140)
    start_date = models.DateTimeField(default=datetime.combine(datetime.today(), datetime.min.time()))
    end_date = models.DateTimeField(default=datetime.combine(datetime.today(), datetime.max.time()))
    comment = models.TextField(blank=True)
    created_date = models.DateTimeField(auto_now_add=True)
    modified_date = models.DateTimeField(auto_now=True)

userprofiles.admin.py

from django.contrib import admin
from django.contrib.auth.admin import UserAdmin
from django.contrib.auth.models import User
from userprofiles.models import UserProfile

class UserProfileInline(admin.StackedInline):
    model = UserProfile
    fk_name = 'user'
    max_num = 1

class CustomUserAdmin(UserAdmin):
    inlines = [UserProfileInline,]
    list_display = ('username', 'email', 'first_name', 'last_name', 'is_staff', 'is_active', 'get_manager', 'get_primary_group')

    def get_primary_group(self, obj):
        try:
            return obj.groups.all()[0]
        except IndexError:
            return ""
    get_primary_group.short_description = 'Group'

    def get_manager(self, obj):
        return obj.userprofile.manager
    get_manager.short_description = 'Manager'


admin.site.unregister(User)
admin.site.register(User, CustomUserAdmin)

userprofiles.models.py

from django.db import models
from django.contrib.auth.models import User


class UserProfile(models.Model):
    user = models.OneToOneField(User)
    manager = models.ForeignKey(User, related_name='manager')