Initial work to support magazines

ram/bookshelf/admin.py

@@ -2,13 +2,17 @@ import html
 
 from django.conf import settings
 from django.contrib import admin
-from django.utils.html import format_html, format_html_join, strip_tags
+from django.utils.html import format_html, strip_tags
 from adminsortable2.admin import SortableAdminBase, SortableInlineAdminMixin
 
 from ram.admin import publish, unpublish
 from ram.utils import generate_csv
 from portal.utils import get_site_conf
-from repository.models import BookDocument, CatalogDocument
+from repository.models import (
+    BookDocument,
+    CatalogDocument,
+    MagazineIssueDocument
+)
 from bookshelf.models import (
     BaseBookProperty,
     BaseBookImage,
@@ -16,6 +20,8 @@ from bookshelf.models import (
     Author,
     Publisher,
     Catalog,
+    Magazine,
+    MagazineIssue,
 )
 
 
@@ -48,6 +54,10 @@ class CatalogDocInline(BookDocInline):
     model = CatalogDocument
 
 
+class MagazineIssueDocInline(BookDocInline):
+    model = MagazineIssueDocument
+
+
 @admin.register(Book)
 class BookAdmin(SortableAdminBase, admin.ModelAdmin):
     inlines = (
@@ -123,14 +133,13 @@ class BookAdmin(SortableAdminBase, admin.ModelAdmin):
     @admin.display(description="Invoices")
     def invoices(self, obj):
         if obj.invoice.exists():
-            html = format_html_join(
-                "<br>",
-                "<a href=\"{}\" target=\"_blank\">{}</a>",
-                ((i.file.url, i) for i in obj.invoice.all())
-            )
+            html = "<br>".join(
+                "<a href=\"{}\" target=\"_blank\">{}</a>".format(
+                    i.file.url, i
+                ) for i in obj.invoice.all())
         else:
             html = "-"
-        return html
+        return format_html(html)
 
     @admin.display(description="Publisher")
     def get_publisher(self, obj):
@@ -208,7 +217,7 @@ class PublisherAdmin(admin.ModelAdmin):
     @admin.display(description="Country")
     def country_flag(self, obj):
         return format_html(
-            '<img src="{}" /> {}', obj.country.flag, obj.country.name
+            '<img src="{}" /> {}'.format(obj.country.flag, obj.country.name)
         )
 
 
@@ -286,14 +295,13 @@ class CatalogAdmin(SortableAdminBase, admin.ModelAdmin):
     @admin.display(description="Invoices")
     def invoices(self, obj):
         if obj.invoice.exists():
-            html = format_html_join(
-                "<br>",
-                "<a href=\"{}\" target=\"_blank\">{}</a>",
-                ((i.file.url, i) for i in obj.invoice.all())
-            )
+            html = "<br>".join(
+                "<a href=\"{}\" target=\"_blank\">{}</a>".format(
+                    i.file.url, i
+                ) for i in obj.invoice.all())
         else:
             html = "-"
-        return html
+        return format_html(html)
 
     def download_csv(modeladmin, request, queryset):
         header = [
@@ -346,3 +354,47 @@ class CatalogAdmin(SortableAdminBase, admin.ModelAdmin):
 
     download_csv.short_description = "Download selected items as CSV"
     actions = [publish, unpublish, download_csv]
+
+
+@admin.register(Issue)
+class MagazineIssueAdmin(admin.ModelAdmin):
+    inlines = (
+        BookPropertyInline,
+        BookImageInline,
+        MagazineIssueDocInline,
+    )
+    list_display = (
+        "__str__",
+        "issue_number",
+        "published",
+    )
+    # autocomplete_fields = ("publisher",)
+    # readonly_fields = ("creation_time", "updated_time")
+    # search_fields = ("title", "publisher__name")
+    # list_filter = ("publisher__name", "language")
+
+    def get_model_perms(self, request):
+        """
+        Return empty perms dict thus hiding the model from admin index.
+        """
+        return {}
+
+    actions = [publish, unpublish]
+
+
+@admin.register(Magazine)
+class MagazineAdmin(admin.ModelAdmin):
+    inlines = (
+        MagazineIssueInline,
+    )
+    list_display = (
+        "__str__",
+        "publisher",
+        "published",
+    )
+    autocomplete_fields = ("publisher",)
+    readonly_fields = ("creation_time", "updated_time")
+    search_fields = ("name", "publisher__name")
+    list_filter = ("publisher__name", "language")
+
+    actions = [publish, unpublish]

ram/bookshelf/migrations/0016_basebook_book_catalogue.py

@@ -101,10 +101,10 @@ class Migration(migrations.Migration):
             model_name="basebook",
             name="old_title",
         ),
-        # migrations.RemoveField(
-        #     model_name="basebook",
-        #     name="old_authors",
-        # ),
+        migrations.RemoveField(
+            model_name="basebook",
+            name="old_authors",
+        ),
         migrations.RemoveField(
             model_name="basebook",
             name="old_publisher",

ram/bookshelf/migrations/0024_alter_basebook_language.py

@@ -1,123 +0,0 @@
-# Generated by Django 6.0 on 2025-12-03 22:07
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ("bookshelf", "0023_delete_basebookdocument"),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name="basebook",
-            name="language",
-            field=models.CharField(
-                choices=[
-                    ("af", "Afrikaans"),
-                    ("ar", "Arabic"),
-                    ("ar-dz", "Algerian Arabic"),
-                    ("ast", "Asturian"),
-                    ("az", "Azerbaijani"),
-                    ("bg", "Bulgarian"),
-                    ("be", "Belarusian"),
-                    ("bn", "Bengali"),
-                    ("br", "Breton"),
-                    ("bs", "Bosnian"),
-                    ("ca", "Catalan"),
-                    ("ckb", "Central Kurdish (Sorani)"),
-                    ("cs", "Czech"),
-                    ("cy", "Welsh"),
-                    ("da", "Danish"),
-                    ("de", "German"),
-                    ("dsb", "Lower Sorbian"),
-                    ("el", "Greek"),
-                    ("en", "English"),
-                    ("en-au", "Australian English"),
-                    ("en-gb", "British English"),
-                    ("eo", "Esperanto"),
-                    ("es", "Spanish"),
-                    ("es-ar", "Argentinian Spanish"),
-                    ("es-co", "Colombian Spanish"),
-                    ("es-mx", "Mexican Spanish"),
-                    ("es-ni", "Nicaraguan Spanish"),
-                    ("es-ve", "Venezuelan Spanish"),
-                    ("et", "Estonian"),
-                    ("eu", "Basque"),
-                    ("fa", "Persian"),
-                    ("fi", "Finnish"),
-                    ("fr", "French"),
-                    ("fy", "Frisian"),
-                    ("ga", "Irish"),
-                    ("gd", "Scottish Gaelic"),
-                    ("gl", "Galician"),
-                    ("he", "Hebrew"),
-                    ("hi", "Hindi"),
-                    ("hr", "Croatian"),
-                    ("hsb", "Upper Sorbian"),
-                    ("ht", "Haitian Creole"),
-                    ("hu", "Hungarian"),
-                    ("hy", "Armenian"),
-                    ("ia", "Interlingua"),
-                    ("id", "Indonesian"),
-                    ("ig", "Igbo"),
-                    ("io", "Ido"),
-                    ("is", "Icelandic"),
-                    ("it", "Italian"),
-                    ("ja", "Japanese"),
-                    ("ka", "Georgian"),
-                    ("kab", "Kabyle"),
-                    ("kk", "Kazakh"),
-                    ("km", "Khmer"),
-                    ("kn", "Kannada"),
-                    ("ko", "Korean"),
-                    ("ky", "Kyrgyz"),
-                    ("lb", "Luxembourgish"),
-                    ("lt", "Lithuanian"),
-                    ("lv", "Latvian"),
-                    ("mk", "Macedonian"),
-                    ("ml", "Malayalam"),
-                    ("mn", "Mongolian"),
-                    ("mr", "Marathi"),
-                    ("ms", "Malay"),
-                    ("my", "Burmese"),
-                    ("nb", "Norwegian Bokmål"),
-                    ("ne", "Nepali"),
-                    ("nl", "Dutch"),
-                    ("nn", "Norwegian Nynorsk"),
-                    ("os", "Ossetic"),
-                    ("pa", "Punjabi"),
-                    ("pl", "Polish"),
-                    ("pt", "Portuguese"),
-                    ("pt-br", "Brazilian Portuguese"),
-                    ("ro", "Romanian"),
-                    ("ru", "Russian"),
-                    ("sk", "Slovak"),
-                    ("sl", "Slovenian"),
-                    ("sq", "Albanian"),
-                    ("sr", "Serbian"),
-                    ("sr-latn", "Serbian Latin"),
-                    ("sv", "Swedish"),
-                    ("sw", "Swahili"),
-                    ("ta", "Tamil"),
-                    ("te", "Telugu"),
-                    ("tg", "Tajik"),
-                    ("th", "Thai"),
-                    ("tk", "Turkmen"),
-                    ("tr", "Turkish"),
-                    ("tt", "Tatar"),
-                    ("udm", "Udmurt"),
-                    ("ug", "Uyghur"),
-                    ("uk", "Ukrainian"),
-                    ("ur", "Urdu"),
-                    ("uz", "Uzbek"),
-                    ("vi", "Vietnamese"),
-                    ("zh-hans", "Simplified Chinese"),
-                    ("zh-hant", "Traditional Chinese"),
-                ],
-                default="en",
-                max_length=7,
-            ),
-        ),
-    ]

ram/bookshelf/migrations/0024_issue_magazine_magazineissue.py

@@ -0,0 +1,226 @@
+# Generated by Django 5.2.8 on 2025-11-13 23:01
+
+import bookshelf.models
+import django.db.models.deletion
+import ram.utils
+import tinymce.models
+import uuid
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("bookshelf", "0023_delete_basebookdocument"),
+        ("metadata", "0025_alter_company_options_alter_manufacturer_options_and_more"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="Issue",
+            fields=[
+                (
+                    "basebook_ptr",
+                    models.OneToOneField(
+                        auto_created=True,
+                        on_delete=django.db.models.deletion.CASCADE,
+                        parent_link=True,
+                        primary_key=True,
+                        serialize=False,
+                        to="bookshelf.basebook",
+                    ),
+                ),
+                ("issue_number", models.CharField(max_length=100)),
+            ],
+            options={
+                "abstract": False,
+            },
+            bases=("bookshelf.basebook",),
+        ),
+        migrations.CreateModel(
+            name="Magazine",
+            fields=[
+                (
+                    "uuid",
+                    models.UUIDField(
+                        default=uuid.uuid4,
+                        editable=False,
+                        primary_key=True,
+                        serialize=False,
+                    ),
+                ),
+                ("description", tinymce.models.HTMLField(blank=True)),
+                ("notes", tinymce.models.HTMLField(blank=True)),
+                ("creation_time", models.DateTimeField(auto_now_add=True)),
+                ("updated_time", models.DateTimeField(auto_now=True)),
+                ("published", models.BooleanField(default=True)),
+                ("name", models.CharField(max_length=200)),
+                (
+                    "image",
+                    models.ImageField(
+                        blank=True,
+                        storage=ram.utils.DeduplicatedStorage,
+                        upload_to=bookshelf.models.magazine_image_upload,
+                    ),
+                ),
+                (
+                    "language",
+                    models.CharField(
+                        choices=[
+                            ("af", "Afrikaans"),
+                            ("ar", "Arabic"),
+                            ("ar-dz", "Algerian Arabic"),
+                            ("ast", "Asturian"),
+                            ("az", "Azerbaijani"),
+                            ("bg", "Bulgarian"),
+                            ("be", "Belarusian"),
+                            ("bn", "Bengali"),
+                            ("br", "Breton"),
+                            ("bs", "Bosnian"),
+                            ("ca", "Catalan"),
+                            ("ckb", "Central Kurdish (Sorani)"),
+                            ("cs", "Czech"),
+                            ("cy", "Welsh"),
+                            ("da", "Danish"),
+                            ("de", "German"),
+                            ("dsb", "Lower Sorbian"),
+                            ("el", "Greek"),
+                            ("en", "English"),
+                            ("en-au", "Australian English"),
+                            ("en-gb", "British English"),
+                            ("eo", "Esperanto"),
+                            ("es", "Spanish"),
+                            ("es-ar", "Argentinian Spanish"),
+                            ("es-co", "Colombian Spanish"),
+                            ("es-mx", "Mexican Spanish"),
+                            ("es-ni", "Nicaraguan Spanish"),
+                            ("es-ve", "Venezuelan Spanish"),
+                            ("et", "Estonian"),
+                            ("eu", "Basque"),
+                            ("fa", "Persian"),
+                            ("fi", "Finnish"),
+                            ("fr", "French"),
+                            ("fy", "Frisian"),
+                            ("ga", "Irish"),
+                            ("gd", "Scottish Gaelic"),
+                            ("gl", "Galician"),
+                            ("he", "Hebrew"),
+                            ("hi", "Hindi"),
+                            ("hr", "Croatian"),
+                            ("hsb", "Upper Sorbian"),
+                            ("hu", "Hungarian"),
+                            ("hy", "Armenian"),
+                            ("ia", "Interlingua"),
+                            ("id", "Indonesian"),
+                            ("ig", "Igbo"),
+                            ("io", "Ido"),
+                            ("is", "Icelandic"),
+                            ("it", "Italian"),
+                            ("ja", "Japanese"),
+                            ("ka", "Georgian"),
+                            ("kab", "Kabyle"),
+                            ("kk", "Kazakh"),
+                            ("km", "Khmer"),
+                            ("kn", "Kannada"),
+                            ("ko", "Korean"),
+                            ("ky", "Kyrgyz"),
+                            ("lb", "Luxembourgish"),
+                            ("lt", "Lithuanian"),
+                            ("lv", "Latvian"),
+                            ("mk", "Macedonian"),
+                            ("ml", "Malayalam"),
+                            ("mn", "Mongolian"),
+                            ("mr", "Marathi"),
+                            ("ms", "Malay"),
+                            ("my", "Burmese"),
+                            ("nb", "Norwegian Bokmål"),
+                            ("ne", "Nepali"),
+                            ("nl", "Dutch"),
+                            ("nn", "Norwegian Nynorsk"),
+                            ("os", "Ossetic"),
+                            ("pa", "Punjabi"),
+                            ("pl", "Polish"),
+                            ("pt", "Portuguese"),
+                            ("pt-br", "Brazilian Portuguese"),
+                            ("ro", "Romanian"),
+                            ("ru", "Russian"),
+                            ("sk", "Slovak"),
+                            ("sl", "Slovenian"),
+                            ("sq", "Albanian"),
+                            ("sr", "Serbian"),
+                            ("sr-latn", "Serbian Latin"),
+                            ("sv", "Swedish"),
+                            ("sw", "Swahili"),
+                            ("ta", "Tamil"),
+                            ("te", "Telugu"),
+                            ("tg", "Tajik"),
+                            ("th", "Thai"),
+                            ("tk", "Turkmen"),
+                            ("tr", "Turkish"),
+                            ("tt", "Tatar"),
+                            ("udm", "Udmurt"),
+                            ("ug", "Uyghur"),
+                            ("uk", "Ukrainian"),
+                            ("ur", "Urdu"),
+                            ("uz", "Uzbek"),
+                            ("vi", "Vietnamese"),
+                            ("zh-hans", "Simplified Chinese"),
+                            ("zh-hant", "Traditional Chinese"),
+                        ],
+                        default="en",
+                        max_length=7,
+                    ),
+                ),
+                (
+                    "publisher",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        to="bookshelf.publisher",
+                    ),
+                ),
+                (
+                    "tags",
+                    models.ManyToManyField(
+                        blank=True, related_name="magazine", to="metadata.tag"
+                    ),
+                ),
+            ],
+            options={
+                "ordering": ["name"],
+            },
+        ),
+        migrations.CreateModel(
+            name="MagazineIssue",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                (
+                    "issue",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="magazine_issue",
+                        to="bookshelf.issue",
+                    ),
+                ),
+                (
+                    "magazine",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="magazine_issue",
+                        to="bookshelf.magazine",
+                    ),
+                ),
+            ],
+            options={
+                "ordering": ["magazine", "issue"],
+                "unique_together": {("magazine", "issue")},
+            },
+        ),
+    ]

ram/bookshelf/models.py

@@ -3,6 +3,7 @@ import shutil
 from django.db import models
 from django.conf import settings
 from django.urls import reverse
+from django.utils.dates import MONTHS
 from django_countries.fields import CountryField
 
 from ram.utils import DeduplicatedStorage
@@ -153,3 +154,62 @@ class Catalog(BaseBook):
     def get_scales(self):
         return "/".join([s.scale for s in self.scales.all()])
     get_scales.short_description = "Scales"
+
+
+class Magazine(BaseModel):
+    name = models.CharField(max_length=200)
+    publisher = models.ForeignKey(Publisher, on_delete=models.CASCADE)
+    ISBN = models.CharField(max_length=17, blank=True)  # 13 + dashes
+    image = models.ImageField(
+        blank=True,
+        upload_to=book_image_upload,
+        storage=DeduplicatedStorage,
+    )
+    language = models.CharField(
+        max_length=7,
+        choices=settings.LANGUAGES,
+        default='en'
+    )
+    tags = models.ManyToManyField(
+        Tag, related_name="magazine", blank=True
+    )
+
+    def delete(self, *args, **kwargs):
+        shutil.rmtree(
+            os.path.join(
+                settings.MEDIA_ROOT, "images", "magazines", str(self.uuid)
+            ),
+            ignore_errors=True
+        )
+        super(Magazine, self).delete(*args, **kwargs)
+
+    class Meta:
+        ordering = ["name"]
+
+    def __str__(self):
+        return self.name
+
+    def get_absolute_url(self):
+        return reverse(
+            "bookshelf_item",
+            kwargs={"selector": "magazine", "uuid": self.uuid}
+        )
+
+
+class MagazineIssue(BaseBook):
+    magazine = models.ForeignKey(
+        Magazine, on_delete=models.CASCADE, related_name="issue"
+    )
+    issue_number = models.CharField(max_length=100)
+    publication_month = models.SmallIntegerField(
+        null=True,
+        blank=True,
+        choices=MONTHS.items()
+    )
+
+    class Meta:
+        unique_together = ("magazine", "issue_number")
+        ordering = ["magazine", "issue_number"]
+
+    def __str__(self):
+        return f"{self.magazine.name} - {self.issue.issue_number}"

ram/consist/admin.py

@@ -54,7 +54,7 @@ class ConsistAdmin(SortableAdminBase, admin.ModelAdmin):
     @admin.display(description="Country")
     def country_flag(self, obj):
         return format_html(
-            '<img src="{}" /> {}', obj.country.flag, obj.country
+            '<img src="{}" /> {}'.format(obj.country.flag, obj.country)
         )
 
     fieldsets = (

ram/metadata/admin.py

@@ -54,7 +54,7 @@ class CompanyAdmin(admin.ModelAdmin):
     @admin.display(description="Country")
     def country_flag(self, obj):
         return format_html(
-            '<img src="{}" /> {}', obj.country.flag, obj.country.name
+            '<img src="{}" /> {}'.format(obj.country.flag, obj.country.name)
         )
 
 
@@ -68,7 +68,7 @@ class ManufacturerAdmin(admin.ModelAdmin):
     @admin.display(description="Country")
     def country_flag(self, obj):
         return format_html(
-            '<img src="{}" /> {}', obj.country.flag, obj.country.name
+            '<img src="{}" /> {}'.format(obj.country.flag, obj.country.name)
         )
 
 

ram/portal/templatetags/dcc.py

@@ -1,38 +1,36 @@
 from django import template
 from django.utils.html import format_html
-from django.utils.safestring import mark_safe
 
 register = template.Library()
 
 
 @register.simple_tag
 def dcc(object):
-    socket = mark_safe(
+    socket = (
         '<i class="bi bi-ban small"></i>'
     )
     decoder = ''
     if object.decoder_interface is not None:
-        socket = mark_safe(
+        socket = (
             f'<abbr title="{object.get_decoder_interface()}">'
             f'<i class="bi bi-dice-6"></i></abbr>'
         )
     if object.decoder:
         if object.decoder.sound:
-            decoder = mark_safe(
+            decoder = (
                 f'<abbr title="{object.decoder}">'
                 '<i class="bi bi-volume-up-fill"></i></abbr>'
             )
         else:
-            decoder = mark_safe(
+            decoder = (
                 f'<abbr title="{object.decoder}'
                 f'({object.get_decoder_interface()})">'
                 '<i class="bi bi-cpu-fill"></i></abbr>'
             )
+
     if decoder:
         return format_html(
-            '{} <i class="bi bi-arrow-bar-left"></i> {}',
-            socket,
-            decoder,
+            f'{socket} <i class="bi bi-arrow-bar-left"></i>{decoder}'
         )
 
-    return socket
+    return format_html(socket)

ram/ram/__init__.py

@@ -1,4 +1,4 @@
 from ram.utils import git_suffix
 
-__version__ = "0.17.15"
+__version__ = "0.17.14"
 __version__ += git_suffix(__file__)

ram/ram/utils.py

@@ -48,9 +48,8 @@ def git_suffix(fname):
 
 def get_image_preview(url, max_size=150):
     return format_html(
-        '<img src="{src}" style="max-width: {size}px; max-height: {size}px; background-color: #eee;" />',  # noqa: E501
-        src=url,
-        size=max_size,
+        '<img src="{src}" style="max-width: {size}px; max-height: {size}px;'
+        'background-color: #eee;" />'.format(src=url, size=max_size)
     )
 
 

ram/repository/models.py

@@ -1,12 +1,11 @@
 from django.db import models
-from django.core.exceptions import ValidationError
 
 from tinymce import models as tinymce
 
 from ram.models import PrivateDocument
 from metadata.models import Decoder, Shop, Tag
 from roster.models import RollingStock
-from bookshelf.models import Book, Catalog
+from bookshelf.models import Book, Catalog, Issue
 
 
 class GenericDocument(PrivateDocument):
@@ -77,6 +76,20 @@ class CatalogDocument(PrivateDocument):
         ]
 
 
+class MagazineIssueDocument(PrivateDocument):
+    issue = models.ForeignKey(
+        Issue, on_delete=models.CASCADE, related_name="document"
+    )
+
+    class Meta:
+        verbose_name_plural = "Magazines documents"
+        constraints = [
+            models.UniqueConstraint(
+                fields=["issue", "file"], name="unique_issue_file"
+            )
+        ]
+
+
 class RollingStockDocument(PrivateDocument):
     rolling_stock = models.ForeignKey(
         RollingStock, on_delete=models.CASCADE, related_name="document"

ram/roster/admin.py

@@ -2,7 +2,7 @@ import html
 
 from django.conf import settings
 from django.contrib import admin
-from django.utils.html import format_html, format_html_join, strip_tags
+from django.utils.html import format_html, strip_tags
 
 from adminsortable2.admin import SortableAdminBase, SortableInlineAdminMixin
 
@@ -44,7 +44,7 @@ class RollingClass(admin.ModelAdmin):
     @admin.display(description="Country")
     def country_flag(self, obj):
         return format_html(
-            '<img src="{}" /> {}', obj.country.flag, obj.country.name
+            '<img src="{}" /> {}'.format(obj.country.flag, obj.country)
         )
 
 
@@ -152,7 +152,7 @@ class RollingStockAdmin(SortableAdminBase, admin.ModelAdmin):
     @admin.display(description="Country")
     def country_flag(self, obj):
         return format_html(
-            '<img src="{}" /> {}', obj.country.flag, obj.country.name
+            '<img src="{}" /> {}'.format(obj.country.flag, obj.country)
         )
 
     fieldsets = (
@@ -222,14 +222,13 @@ class RollingStockAdmin(SortableAdminBase, admin.ModelAdmin):
     @admin.display(description="Invoices")
     def invoices(self, obj):
         if obj.invoice.exists():
-            html = format_html_join(
-                "<br>",
-                "<a href=\"{}\" target=\"_blank\">{}</a>",
-                ((i.file.url, i) for i in obj.invoice.all())
-            )
+            html = "<br>".join(
+                "<a href=\"{}\" target=\"_blank\">{}</a>".format(
+                    i.file.url, i
+                ) for i in obj.invoice.all())
         else:
             html = "-"
-        return html
+        return format_html(html)
 
     def download_csv(modeladmin, request, queryset):
         header = [