feat:cms relation hospital bug fix

apps/organization/serializers.py

@@ -9,10 +9,15 @@ class CmsInstitutionSerializer(serializers.ModelSerializer):
     """CMS 机构（医院）序列化器。
 
     - `code` 显式声明以去掉默认 UniqueValidator，改用自定义错误码校验唯一性。
-    - `banner_url` 返回可访问的完整 URL（未配置时为空串，便于管理端识别「未设图」）。
+    - `banner_url` **可写**（新增/编辑可传，可选）：入参可为静态相对路径（如
+      `institutions/xxx.png`）或完整 `http(s)` URL；**输出**统一转为可访问的完整 URL
+      （未配置时为空串，便于管理端识别「未设图」）。传空串则清空。
     """
     code = serializers.CharField(max_length=100)
-    banner_url = serializers.SerializerMethodField()
+    banner_url = serializers.CharField(
+        max_length=500, required=False, allow_blank=True,
+        help_text='机构 Banner 图：相对静态路径或完整 http(s) URL；可选，传空串清空',
+    )
 
     class Meta:
         model = Institution
@@ -22,7 +27,12 @@ class CmsInstitutionSerializer(serializers.ModelSerializer):
         ]
         read_only_fields = ['id', 'created_at', 'updated_at']
 
-    def get_banner_url(self, obj):
+    def to_representation(self, instance):
+        data = super().to_representation(instance)
+        data['banner_url'] = self._full_banner_url(instance)
+        return data
+
+    def _full_banner_url(self, obj):
         if not obj.banner_url:
             return ''
         value = obj.banner_url
@@ -33,6 +43,9 @@ class CmsInstitutionSerializer(serializers.ModelSerializer):
         path = prefix + '/' + settings.STATIC_URL.strip('/') + '/' + value.lstrip('/')
         return request.build_absolute_uri(path) if request else path
 
+    def validate_banner_url(self, value):
+        return (value or '').strip()
+
     def validate_code(self, value):
         value = (value or '').strip()
         if not value: