optimization of AttachmentInline

preventing iteration over all attachments in database

post_office/admin.py

@@ -33,20 +33,16 @@ def get_message_preview(instance):
 class AttachmentInline(admin.StackedInline):
     model = Attachment.emails.through
     extra = 0
+    autocomplete_fields = ["attachment"]
 
     def get_queryset(self, request):
         """
         Exclude inlined attachments from queryset, because they usually have meaningless names and
         are displayed anyway.
         """
-        queryset = super().get_queryset(request)
-        inlined_attachments = [
-            a.id
-            for a in queryset
-            if isinstance(a.attachment.headers, dict)
-            and a.attachment.headers.get("Content-Disposition", "").startswith("inline")
-        ]
-        return queryset.exclude(id__in=inlined_attachments)
+        return super().get_queryset(request).exclude(
+            **{"attachment__headers__Content-Disposition__startswith": "inline"}
+        )
 
 
 class LogInline(admin.TabularInline):
@@ -314,6 +310,7 @@ def save_model(self, request, obj, form, change):
 class AttachmentAdmin(admin.ModelAdmin):
     list_display = ['name', 'file']
     filter_horizontal = ['emails']
+    search_fields = ["name"]
 
 
 admin.site.register(Email, EmailAdmin)

post_office/migrations/0012_auto_20220914_1745.py

@@ -0,0 +1,28 @@
+# Generated by Django 3.2.15 on 2022-09-14 15:45
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("post_office", "0011_models_help_text"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="attachment",
+            name="headers",
+            field=models.JSONField(blank=True, null=True, verbose_name="Headers"),
+        ),
+        migrations.AlterField(
+            model_name="email",
+            name="context",
+            field=models.JSONField(blank=True, null=True, verbose_name="Context"),
+        ),
+        migrations.AlterField(
+            model_name="email",
+            name="headers",
+            field=models.JSONField(blank=True, null=True, verbose_name="Headers"),
+        ),
+    ]

post_office/models.py

@@ -10,7 +10,6 @@
 from django.utils.encoding import smart_str
 from django.utils.translation import pgettext_lazy, gettext_lazy as _
 from django.utils import timezone
-from jsonfield import JSONField
 
 from post_office import cache
 from post_office.fields import CommaSeparatedEmailField
@@ -68,7 +67,7 @@ class Email(models.Model):
                                       help_text=_("Email won't be sent after this timestamp"))
     message_id = models.CharField("Message-ID", null=True, max_length=255, editable=False)
     number_of_retries = models.PositiveIntegerField(null=True, blank=True)
-    headers = JSONField(_('Headers'), blank=True, null=True)
+    headers = models.JSONField(_("Headers"), blank=True, null=True)
     template = models.ForeignKey('post_office.EmailTemplate', blank=True,
                                  null=True, verbose_name=_("Email template"),
                                  on_delete=models.CASCADE)
@@ -316,7 +315,7 @@ class Attachment(models.Model):
     emails = models.ManyToManyField(Email, related_name='attachments',
                                     verbose_name=_('Emails'))
     mimetype = models.CharField(max_length=255, default='', blank=True)
-    headers = JSONField(_('Headers'), blank=True, null=True)
+    headers = models.JSONField(_("Headers"), blank=True, null=True)
 
     class Meta:
         app_label = 'post_office'

post_office/settings.py

@@ -124,6 +124,7 @@ def get_message_id_fqdn():
     return get_config().get('MESSAGE_ID_FQDN', DNS_NAME)
 
 
-CONTEXT_FIELD_CLASS = get_config().get('CONTEXT_FIELD_CLASS',
-                                       'jsonfield.JSONField')
+CONTEXT_FIELD_CLASS = get_config().get(
+    "CONTEXT_FIELD_CLASS", "django.db.models.JSONField"
+)
 context_field_class = import_string(CONTEXT_FIELD_CLASS)