排序

backend/community/admin.py

@@ -1,5 +1,7 @@
 from django.contrib import admin
 from django.utils.html import format_html
+from django.urls import path, reverse
+from django.shortcuts import redirect
 from unfold.admin import ModelAdmin, TabularInline
 from unfold.decorators import display
 from .models import Activity, ActivitySignup, Topic, Reply, TopicMedia, Announcement
@@ -28,6 +30,83 @@ class TopicMediaInline(TabularInline):
     readonly_fields = ('created_at',)
     can_delete = True
 
+class OrderableAdminMixin:
+    """
+    为 Admin 添加排序功能的 Mixin
+    提供上移、下移按钮，直接交换 order 值
+    """
+    def get_urls(self):
+        urls = super().get_urls()
+        custom_urls = [
+            path('<path:object_id>/move-up/', self.admin_site.admin_view(self.move_up_view), name=f'{self.model._meta.app_label}_{self.model._meta.model_name}_move_up'),
+            path('<path:object_id>/move-down/', self.admin_site.admin_view(self.move_down_view), name=f'{self.model._meta.app_label}_{self.model._meta.model_name}_move_down'),
+        ]
+        return custom_urls + urls
+
+    def move_up_view(self, request, object_id):
+        obj = self.get_object(request, object_id)
+        if obj:
+            # 找到排在它前面的一个 (order 小于它的最大值)
+            prev_obj = self.model.objects.filter(order__lt=obj.order).order_by('-order').first()
+            if prev_obj:
+                # 交换
+                obj.order, prev_obj.order = prev_obj.order, obj.order
+                obj.save()
+                prev_obj.save()
+                self.message_user(request, f"成功将 {obj} 上移")
+            else:
+                # 已经是第一个，或者前面没有更小的 order
+                pass
+        return redirect(request.META.get('HTTP_REFERER', '..'))
+
+    def move_down_view(self, request, object_id):
+        obj = self.get_object(request, object_id)
+        if obj:
+            # 找到排在它后面的一个 (order 大于它的最小值)
+            next_obj = self.model.objects.filter(order__gt=obj.order).order_by('order').first()
+            if next_obj:
+                # 交换
+                obj.order, next_obj.order = next_obj.order, obj.order
+                obj.save()
+                next_obj.save()
+                self.message_user(request, f"成功将 {obj} 下移")
+        return redirect(request.META.get('HTTP_REFERER', '..'))
+
+    def order_actions(self, obj):
+        # 只有专家用户才显示排序按钮
+        if not getattr(obj, 'is_star', True): # 默认为True是为了兼容其他模型，WeChatUser有is_star字段
+            return "默认排序"
+
+        # 使用 inline style 实现基本样式
+        btn_style = (
+            "display: inline-flex; align-items: center; justify-content: center; "
+            "width: 26px; height: 26px; border-radius: 6px; "
+            "background-color: #f3f4f6; color: #4b5563; text-decoration: none; "
+            "border: 1px solid #e5e7eb; transition: all 0.2s;"
+        )
+        # onmouseover js
+        hover_js = "this.style.backgroundColor='#dbeafe'; this.style.color='#2563eb'; this.style.borderColor='#bfdbfe';"
+        out_js = "this.style.backgroundColor='#f3f4f6'; this.style.color='#4b5563'; this.style.borderColor='#e5e7eb';"
+
+        return format_html(
+            '<div style="display: flex; align-items: center; gap: 6px;">'
+            '<a href="{}" title="上移" style="{}" onmouseover="{}" onmouseout="{}">'
+            '<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M18 15l-6-6-6 6"/></svg>'
+            '</a>'
+            '<span style="font-weight: 700; font-family: system-ui, -apple-system, sans-serif; min-width: 20px; text-align: center; color: #374151; font-size: 13px;">{}</span>'
+            '<a href="{}" title="下移" style="{}" onmouseover="{}" onmouseout="{}">'
+            '<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M6 9l6 6 6-6"/></svg>'
+            '</a>'
+            '</div>',
+            reverse(f'admin:{self.model._meta.app_label}_{self.model._meta.model_name}_move_up', args=[obj.pk]),
+            btn_style, hover_js, out_js,
+            obj.order,
+            reverse(f'admin:{self.model._meta.app_label}_{self.model._meta.model_name}_move_down', args=[obj.pk]),
+            btn_style, hover_js, out_js,
+        )
+    order_actions.short_description = "排序调节"
+    order_actions.allow_tags = True
+
 @admin.register(Activity)
 class ActivityAdmin(ModelAdmin):
     list_display = ('title', 'banner_display', 'start_time', 'location', 'signup_count', 'is_visible', 'is_active', 'auto_confirm', 'created_at')
@@ -115,12 +194,24 @@ class ActivitySignupAdmin(ModelAdmin):
         return "-"
 
 @admin.register(Topic)
-class TopicAdmin(ModelAdmin):
-    list_display = ('title', 'category', 'author', 'get_related_item', 'reply_count', 'view_count', 'is_pinned', 'created_at')
+class TopicAdmin(OrderableAdminMixin, ModelAdmin):
+    list_display = ('title', 'category', 'author', 'get_related_item', 'reply_count', 'view_count', 'is_pinned', 'created_at', 'order_actions')
     list_filter = ('category', 'is_pinned', 'created_at', 'related_product', 'related_service', 'related_course')
     search_fields = ('title', 'content', 'author__nickname')
     autocomplete_fields = ['author', 'related_product', 'related_service', 'related_course']
     inlines = [TopicMediaInline, ReplyInline]
+    actions = ['reset_ordering']
+
+    @admin.action(description="重置排序 (按ID顺序)")
+    def reset_ordering(self, request, queryset):
+        """
+        将所有帖子按ID顺序重新分配order值
+        """
+        all_objects = Topic.objects.all().order_by('id')
+        for index, obj in enumerate(all_objects, start=1):
+            obj.order = index
+            obj.save(update_fields=['order'])
+        self.message_user(request, f"成功重置了 {all_objects.count()} 个帖子的排序权重。")
     
     fieldsets = (
         ('帖子内容', {