work hard on this

aircox_web/admin.py

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+import copy
+
+from django.contrib import admin
+from django.utils.translation import ugettext_lazy as _
+
+from content_editor.admin import ContentEditor
+from feincms3 import plugins
+from feincms3.admin import TreeAdmin
+
+from aircox import models as aircox
+from . import models
+from aircox.admin.playlist import TracksInline
+from aircox.admin.mixins import UnrelatedInlineMixin
+
+
+@admin.register(models.SiteSettings)
+class SettingsAdmin(admin.ModelAdmin):
+    pass
+
+
+class PageDiffusionPlaylist(UnrelatedInlineMixin, TracksInline):
+    parent_model = aircox.Diffusion
+    fields = list(TracksInline.fields)
+    fields.remove('timestamp')
+
+    def get_parent(self, view_obj):
+        return view_obj and view_obj.diffusion
+
+    def save_parent(self, parent, view_obj):
+        parent.save()
+        view_obj.diffusion = parent
+        view_obj.save()
+
+
+@admin.register(models.Page)
+class PageAdmin(ContentEditor, TreeAdmin):
+    list_display = ["indented_title", "move_column", "is_active"]
+    prepopulated_fields = {"slug": ("title",)}
+    # readonly_fields = ('diffusion',)
+
+    fieldsets = (
+        (_('Main'), {
+            'fields': ['title', 'slug', 'by_program', 'summary'],
+            'classes': ('tabbed', 'uncollapse')
+        }),
+        (_('Settings'), {
+            'fields': ['show_author', 'featured', 'allow_comments',
+                       'status', 'static_path', 'path'],
+            'classes': ('tabbed',)
+        }),
+        (_('Infos'), {
+            'fields': ['diffusion'],
+            'classes': ('tabbed',)
+        }),
+    )
+
+    inlines = [
+        plugins.richtext.RichTextInline.create(models.RichText),
+        plugins.image.ImageInline.create(models.Image),
+    ]
+
+    def get_inline_instances(self, request, obj=None):
+        inlines = super().get_inline_instances(request, obj)
+        if obj and obj.diffusion:
+            inlines.insert(0, PageDiffusionPlaylist(self.model, self.admin_site))
+        return inlines
+
+