finish

backend/community/models.py

@@ -7,7 +7,8 @@ class Activity(models.Model):
     """
     title = models.CharField(max_length=100, verbose_name="活动标题")
     description = models.TextField(verbose_name="活动详情")
-    banner = models.ImageField(upload_to='activities/banners/', verbose_name="活动Banner图")
+    banner = models.ImageField(upload_to='activities/banners/', verbose_name="活动Banner图", null=True, blank=True)
+    banner_url = models.URLField(verbose_name="活动Banner链接", null=True, blank=True, help_text="可直接填写图片链接，若同时上传图片，将优先显示上传的图片")
     start_time = models.DateTimeField(verbose_name="开始时间")
     end_time = models.DateTimeField(verbose_name="结束时间")
     location = models.CharField(max_length=100, verbose_name="活动地点")
@@ -15,6 +16,24 @@ class Activity(models.Model):
     is_active = models.BooleanField(default=True, verbose_name="是否启用")
     created_at = models.DateTimeField(auto_now_add=True, verbose_name="创建时间")
 
+    def clean(self):
+        from django.core.exceptions import ValidationError
+        if not self.banner and not self.banner_url:
+            raise ValidationError("Banner图片和Banner链接必须至少填写一项")
+
+    def save(self, *args, **kwargs):
+        self.clean()
+        super().save(*args, **kwargs)
+
+    @property
+    def display_banner_url(self):
+        """
+        获取Banner显示的URL，优先使用上传的图片
+        """
+        if self.banner:
+            return self.banner.url
+        return self.banner_url
+
     def __str__(self):
         return self.title