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from django.contrib import admin
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from django.contrib.admin.models import DELETION
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from django.contrib.contenttypes.models import ContentType
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from django.urls import reverse, NoReverseMatch
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from django.utils.encoding import force_str
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from django.utils.html import escape
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from django.utils.safestring import mark_safe
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from django.utils.translation import gettext_lazy as _
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class LogEntryAdmin(admin.ModelAdmin):
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"""Django管理员日志条目的自定义管理界面"""
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# 列表页过滤器配置：按内容类型过滤
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list_filter = [
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'content_type'
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]
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# 搜索字段配置：可按对象表示和变更消息搜索
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search_fields = [
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'object_repr',
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'change_message'
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]
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# 列表页中可点击的链接字段
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list_display_links = [
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'action_time',
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'get_change_message',
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]
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# 列表页显示的字段
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list_display = [
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'action_time', # 操作时间
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'user_link', # 用户链接（自定义）
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'content_type', # 内容类型
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'object_link', # 对象链接（自定义）
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'get_change_message', # 变更消息
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]
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def has_add_permission(self, request):
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"""禁止添加新的日志条目"""
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return False
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def has_change_permission(self, request, obj=None):
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"""修改权限控制：只允许超级用户或具有特定权限的用户查看（不允许POST修改）"""
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return (
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request.user.is_superuser or
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request.user.has_perm('admin.change_logentry')
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) and request.method != 'POST'
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def has_delete_permission(self, request, obj=None):
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"""禁止删除日志条目"""
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return False
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def object_link(self, obj):
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"""生成对象链接的显示"""
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object_link = escape(obj.object_repr) # 转义对象表示字符串
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content_type = obj.content_type
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# 如果不是删除操作且内容类型存在，尝试生成可点击的链接
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if obj.action_flag != DELETION and content_type is not None:
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try:
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# 构建管理员修改页面的URL
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url = reverse(
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'admin:{}_{}_change'.format(content_type.app_label,
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content_type.model),
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args=[obj.object_id]
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)
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# 创建HTML链接
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object_link = '<a href="{}">{}</a>'.format(url, object_link)
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except NoReverseMatch:
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# 如果无法生成URL，保持原样
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pass
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return mark_safe(object_link) # 标记为安全HTML
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# 设置对象链接字段的排序和显示名称
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object_link.admin_order_field = 'object_repr'
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object_link.short_description = _('object')
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def user_link(self, obj):
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"""生成用户链接的显示"""
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content_type = ContentType.objects.get_for_model(type(obj.user))
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user_link = escape(force_str(obj.user)) # 转义用户字符串
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try:
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# 构建用户修改页面的URL
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url = reverse(
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'admin:{}_{}_change'.format(content_type.app_label,
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content_type.model),
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args=[obj.user.pk]
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)
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# 创建HTML链接
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user_link = '<a href="{}">{}</a>'.format(url, user_link)
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except NoReverseMatch:
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# 如果无法生成URL，保持原样
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pass
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return mark_safe(user_link) # 标记为安全HTML
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# 设置用户链接字段的排序和显示名称
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user_link.admin_order_field = 'user'
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user_link.short_description = _('user')
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def get_queryset(self, request):
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"""获取查询集，预取content_type关系以提高性能"""
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queryset = super(LogEntryAdmin, self).get_queryset(request)
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return queryset.prefetch_related('content_type')
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def get_actions(self, request):
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"""获取可用的批量操作，移除删除选中操作"""
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actions = super(LogEntryAdmin, self).get_actions(request)
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if 'delete_selected' in actions:
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del actions['delete_selected'] # 移除批量删除选项
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return actions |
