Александр Прощенков

from django.db import models
from django.utils.translation import ugettext_lazy as _


class SchoolClass(models.Model):
    name = models.CharField(
        _('Класс'),
        max_length=10,
        db_index=True,
        unique=True,
        help_text=_('Название класса.'),
    )

    class Meta:
        verbose_name = _('Класс')
        verbose_name_plural = _('Классы')

    def __str__(self):
        return self.name


class Pupil(models.Model):
    first_name = models.CharField(
        _('Имя'),
        max_length=100,
        db_index=True,
        help_text=_('Имя учащегося.'),
    )
    last_name = models.CharField(
        _('Фамилия'),
        max_length=100,
        db_index=True,
        help_text=_('Фамилия учащегося.'),
    )
    school_class = models.ForeignKey(
        to=SchoolClass, on_delete=models.CASCADE,
        verbose_name=_('Класс'), related_name='pupils',
        help_text=_('Название класса.'),
    )

    class Meta:
        verbose_name = _('Ученик')
        verbose_name_plural = _('Ученики')
        indexes = (
            models.Index(fields=['first_name', 'last_name']),
        )

    def __str__(self):
        return self.full_name

    @property
    def full_name(self):
        return '{} {}'.format(self.first_name, self.last_name)


class Schedule(models.Model):
    ATTEND = 'attend'
    ABSENT = 'absent'
    STATUS_CHOICES = (
        (ATTEND, 'Присутствовал'),
        (ABSENT, 'Отсутствовал'),
    )

    pupil = models.ForeignKey(
        to=Pupil, on_delete=models.CASCADE,
        verbose_name=_('Ученик'), related_name='schedules',
        help_text=_('Фамилия и имя учащегося.')
    )
    date = models.DateField(
        _('Дата'),
        db_index=True,
        help_text=_('Дата.')
    )
    status = models.CharField(
        _('Статус'), max_length=10,
        choices=STATUS_CHOICES, default=ABSENT,
        db_index=True,
        help_text=_('Статус.')
    )

    class Meta:
        verbose_name = _('Расписание')
        verbose_name_plural = _('Расписания')
        indexes = (
            models.Index(fields=['date', 'status']),
        )
        unique_together = ('pupil', 'date',)

from django.contrib import admin

from schedule.models import (
    SchoolClass,
    Pupil,
    Schedule
)


class PupilInLIne(admin.TabularInline):
    model = Pupil
    fields = ('first_name', 'last_name')
    extra = 1


class ScheduleInLIne(admin.TabularInline):
    model = Schedule
    fields = ('date', 'status')
    extra = 1


@admin.register(SchoolClass)
class SchoolClassAdmin(admin.ModelAdmin):
    list_display = ('name',)
    list_display_links = ('name',)
    inlines = (PupilInLIne,)
    list_filter = ('name',)
    search_fields = ('name',)


@admin.register(Pupil)
class PupilAdmin(admin.ModelAdmin):
    list_display = ('full_name', 'school_class')
    list_display_links = ('full_name',)
    inlines = (ScheduleInLIne,)
    raw_id_fields = ('school_class',)
    list_select_related = ('school_class',)
    search_fields = ('first_name', 'last_name', 'school_class__name')
    list_filter = ('school_class__name',)

class PupilScheduleDetailView(DetailView):
    model = Pupil
    template_name = 'pupil_schedule_detail.html'

    def get_context_data(self, **kwargs):
        context_data = super().get_context_data(**kwargs)
        schedule_queryset = self.object.schedules.all().select_related(
            'pupil'
        ).values(
            'pupil__first_name',
            'pupil__last_name',
            'date', 'status'
        )
        context_data.update({
            'schedules': schedule_queryset
        })
        return context_data

{% if schedules %}
  <table>

    {% for schedule in schedules %}
      <tr>
        <td>{{ schedule.pupil__first_name }} {{ schedule.pupil__last_name }}</td>
        <td>{{ schedule.date }}</td>
        <td>{{ schedule.status }}</td>
      </tr>
    {% endfor %}

  </table>
{% else %}
  <p>Данных нет!</p>
{% endif %}