Ora più utenti possono avere lo stesso tema e li setto con una Inline

admin_interface/admin.py

@@ -1,13 +1,20 @@
 # -*- coding: utf-8 -*-
 
-from admin_interface.compat import gettext_lazy as _
-from admin_interface.models import Theme
-
-from django.contrib.auth import models as auth_models
 from django.contrib import admin
+from django.contrib.auth import models as auth_models
+
+from admin_interface.compat import gettext_lazy as _
+from admin_interface.models import Theme, UserTheme
+
+
+class UserInline(admin.TabularInline):
+    model = UserTheme
+    extra = 0
+    autocomplete_fields = ('user', )
 
 
 class ThemeAdmin(admin.ModelAdmin):
+    inlines = [UserInline, ]
 
     list_display = (
         "name",
@@ -136,7 +143,8 @@ class ThemeAdmin(admin.ModelAdmin):
                 ),
             },
         ),
-        (_("Navigation Bar"), {"classes": ("wide",), "fields": ("foldable_apps",)}),
+        (_("Navigation Bar"), {"classes": (
+            "wide",), "fields": ("foldable_apps",)}),
         (
             _("Related Modal"),
             {
@@ -174,10 +182,6 @@ class ThemeAdmin(admin.ModelAdmin):
             _("Recent Actions"),
             {"classes": ("wide",), "fields": ("recent_actions_visible",)},
         ),
-        (
-            _("Users theme"),
-            {"classes": ("wide",), "fields": ("user",)},
-        ),
     )
 
     save_on_top = True

admin_interface/context_processor.py

@@ -7,7 +7,7 @@ def get_active_theme(request):
     objs_active_count = len(objs_active_ls)
 
     if objs_active_count == 0:
-        obj = objs_manager.all().first()
+        obj = objs_manager.first()
         if obj:
             obj.set_active()
         else:

admin_interface/migrations/0027_usertheme_m2m.py

@@ -0,0 +1,37 @@
+# Generated by Django 3.2.13 on 2022-04-28 16:03
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('admin_interface', '0026_add_user_option'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='theme',
+            name='user',
+        ),
+        migrations.CreateModel(
+            name='UserTheme',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('theme', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='admin_interface.theme')),
+                ('user', models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL, unique=True)),
+            ],
+            options={
+                'verbose_name': 'Users theme',
+                'verbose_name_plural': 'Users themes',
+            },
+        ),
+        migrations.AddField(
+            model_name='theme',
+            name='users',
+            field=models.ManyToManyField(through='admin_interface.UserTheme', to=settings.AUTH_USER_MODEL),
+        ),
+    ]

admin_interface/models.py

@@ -14,6 +14,17 @@ from admin_interface.compat import FileExtensionValidator, force_str
 from admin_interface.compat import gettext_lazy as _
 
 
+@python_2_unicode_compatible
+class UserTheme(models.Model):
+    class Meta:
+        verbose_name = 'Users theme'
+        verbose_name_plural = 'Users themes'
+
+    user = models.ForeignKey(
+        'auth.User', on_delete=models.CASCADE, null=True, unique=True)
+    theme = models.ForeignKey('Theme', on_delete=models.CASCADE)
+
+
 @python_2_unicode_compatible
 class Theme(models.Model):
     @staticmethod
@@ -62,7 +73,7 @@ class Theme(models.Model):
 
         elif objs_active_count > 1:
             for frame_record in inspect.stack():
-                if frame_record[3]=='get_response':
+                if frame_record[3] == 'get_response':
                     request = frame_record[0].f_locals['request']
                     user = request.user
                     break
@@ -83,7 +94,7 @@ class Theme(models.Model):
     active = models.BooleanField(default=True, verbose_name=_("active"))
 
     demo = models.BooleanField(default=False, verbose_name=_("is demo"))
-    user = models.ForeignKey('auth.User', on_delete=models.CASCADE, null=True, blank=True, verbose_name=_("active for user"))
+    users = models.ManyToManyField('auth.User', through=UserTheme)
 
     title = models.CharField(
         max_length=50,
@@ -98,7 +109,8 @@ class Theme(models.Model):
         max_length=10,
         verbose_name=_("color"),
     )
-    title_visible = models.BooleanField(default=True, verbose_name=_("visible"))
+    title_visible = models.BooleanField(
+        default=True, verbose_name=_("visible"))
 
     logo = models.FileField(
         upload_to="admin-interface/logo/",
@@ -138,7 +150,8 @@ class Theme(models.Model):
         verbose_name=_("favicon"),
     )
 
-    env_name = models.CharField(blank=True, max_length=50, verbose_name=_("name"))
+    env_name = models.CharField(
+        blank=True, max_length=50, verbose_name=_("name"))
     env_color = ColorField(
         blank=True,
         default="#E74C3C",
@@ -309,7 +322,8 @@ class Theme(models.Model):
         verbose_name=_("text color"),
     )
 
-    related_modal_active = models.BooleanField(default=True, verbose_name=_("active"))
+    related_modal_active = models.BooleanField(
+        default=True, verbose_name=_("active"))
     related_modal_background_color = ColorField(
         blank=True,
         default="#000000",
@@ -376,7 +390,8 @@ class Theme(models.Model):
         default=True, verbose_name=_("sticky position")
     )
 
-    foldable_apps = models.BooleanField(default=True, verbose_name=_("foldable apps"))
+    foldable_apps = models.BooleanField(
+        default=True, verbose_name=_("foldable apps"))
 
     recent_actions_visible = models.BooleanField(
         default=True, verbose_name=_("visible")