Include models in Django admin

aleksis/apps/chronos/admin.py

 from django.contrib import admin
+from django.utils.html import format_html
 
-from .models import TimetableWidget
+from .models import (
+    TimetableWidget,
+    Lesson,
+    LessonSubstitution,
+    SupervisionSubstitution,
+    LessonPeriod,
+    Absence,
+    Event,
+    Holiday,
+    Supervision,
+    Subject,
+    SupervisionArea,
+    Room,
+    AbsenceReason,
+    Break,
+    TimePeriod,
+)
+from .util.format import format_date_period, format_m2m
 
-admin.site.register(TimetableWidget)
+
+def colour_badge(fg: str, bg: str, val: str):
+    html = """
+    <div style="
+        color: {};
+        background-color: {};
+        padding-top: 3px;
+        padding-bottom: 4px;
+        text-align: center;
+        border-radius: 3px;
+    ">{}</span>
+    """
+    return format_html(html, fg, bg, val)
+
+
+class AbsenceReasonAdmin(admin.ModelAdmin):
+    list_display = ("short_name", "name")
+    list_display_links = ("short_name", "name")
+
+
+admin.site.register(AbsenceReason, AbsenceReasonAdmin)
+
+
+class AbsenceAdmin(admin.ModelAdmin):
+    def start(self, obj):
+        return format_date_period(obj.date_start, obj.period_from)
+
+    def end(self, obj):
+        return format_date_period(obj.date_end, obj.period_to)
+
+    list_display = ("__str__", "reason", "start", "end")
+
+
+admin.site.register(Absence, AbsenceAdmin)
+
+
+class SupervisionInline(admin.TabularInline):
+    model = Supervision
+
+
+class BreakAdmin(admin.ModelAdmin):
+    list_display = ("__str__", "after_period", "before_period")
+    inlines = [SupervisionInline]
+
+
+admin.site.register(Break, BreakAdmin)
+
+
+class EventAdmin(admin.ModelAdmin):
+    def start(self, obj):
+        return format_date_period(obj.date_start, obj.period_from)
+
+    def end(self, obj):
+        return format_date_period(obj.date_end, obj.period_to)
+
+    def _groups(self, obj):
+        return format_m2m(obj.groups)
+
+    def _teachers(self, obj):
+        return format_m2m(obj.teachers)
+
+    def _rooms(self, obj):
+        return format_m2m(obj.rooms)
+
+    filter_horizontal = ("groups", "teachers", "rooms")
+    list_display = ("__str__", "_groups", "_teachers", "_rooms", "start", "end")
+
+
+admin.site.register(Event, EventAdmin)
+
+
+class HolidayAdmin(admin.ModelAdmin):
+    list_display = ("title", "date_start", "date_end")
+
+
+admin.site.register(Holiday, HolidayAdmin)
+
+
+class LessonPeriodInline(admin.TabularInline):
+    model = LessonPeriod
+
+
+class LessonSubstitutionAdmin(admin.ModelAdmin):
+    list_display = ("lesson_period", "week", "date")
+    list_display_links = ("lesson_period", "week", "date")
+    filter_horizontal = ("teachers",)
+
+
+admin.site.register(LessonSubstitution, LessonSubstitutionAdmin)
+
+
+class LessonAdmin(admin.ModelAdmin):
+    def _groups(self, obj):
+        return format_m2m(obj.groups)
+
+    def _teachers(self, obj):
+        return format_m2m(obj.teachers)
+
+    filter_horizontal = ["teachers", "groups"]
+    inlines = [LessonPeriodInline]
+    list_filter = ("subject", "groups", "groups__parent_groups", "teachers")
+    list_display = ("_groups", "subject", "_teachers")
+
+
+admin.site.register(Lesson, LessonAdmin)
+
+
+class RoomAdmin(admin.ModelAdmin):
+    list_display = ("short_name", "name")
+    list_display_links = ("short_name", "name")
+
+
+admin.site.register(Room, RoomAdmin)
+
+
+class SubjectAdmin(admin.ModelAdmin):
+    def _colour(self, obj):
+        return colour_badge(obj.colour_fg, obj.colour_bg, obj.abbrev,)
+
+    list_display = ("abbrev", "name", "_colour")
+    list_display_links = ("abbrev", "name")
+
+
+admin.site.register(Subject, SubjectAdmin)
+
+
+class SupervisionAreaAdmin(admin.ModelAdmin):
+    def _colour(self, obj):
+        return colour_badge(obj.colour_fg, obj.colour_bg, obj.short_name,)
+
+    list_display = ("short_name", "name", "_colour")
+    list_display_links = ("short_name", "name")
+    inlines = [SupervisionInline]
+
+
+admin.site.register(SupervisionArea, SupervisionAreaAdmin)
+
+
+class SupervisionSubstitutionAdmin(admin.ModelAdmin):
+    list_display = ("supervision", "date")
+
+
+admin.site.register(SupervisionSubstitution, SupervisionSubstitutionAdmin)
+
+
+class SupervisionAdmin(admin.ModelAdmin):
+    list_display = ("break_item", "area", "teacher")
+
+
+admin.site.register(Supervision, SupervisionAdmin)
+
+
+class TimePeriodAdmin(admin.ModelAdmin):
+    list_display = ("weekday", "period", "time_start", "time_end")
+    list_display_links = ("weekday", "period")
+
+
+admin.site.register(TimePeriod, TimePeriodAdmin)
+
+
+class TimetableWidgetAdmin(admin.ModelAdmin):
+    list_display = ("title", "active")
+
+
+admin.site.register(TimetableWidget, TimetableWidgetAdmin)

aleksis/apps/chronos/util/format.py

+from django.utils.formats import date_format
+
+
+def format_m2m(f, attr: str = "short_name"):
+    return ", ".join([getattr(x, attr) for x in f.all()])
+
+
+def format_date_period(date, period):
+    return "{}, {}.".format(date_format(date), period.period)