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# 余秋玲: 此文件定义了Django管理后台的日志条目管理类
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# 余秋玲: 导入必要的模块和类
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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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# 余秋玲: 设置列表页过滤器字段
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list_filter = [
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'content_type'
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]
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# 余秋玲: 设置搜索字段
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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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# 余秋玲: 设置列表页可点击链接字段
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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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# 余秋玲: 设置列表页显示字段
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list_display = [
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'action_time',
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'user_link',
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'content_type',
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'object_link',
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'get_change_message',
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]
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def has_add_permission(self, request):
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# 余秋玲: 禁用添加权限
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return False
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def has_change_permission(self, request, obj=None):
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# 余秋玲: 只有超级用户或有特定权限的用户可以查看日志
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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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# 余秋玲: 禁用删除权限
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return False
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def object_link(self, obj):
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# 余秋玲: 创建对象链接，如果是删除操作则不显示链接
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object_link = escape(obj.object_repr)
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content_type = obj.content_type
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if obj.action_flag != DELETION and content_type is not None:
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# 余秋玲: 尝试返回实际链接而不是对象字符串
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try:
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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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object_link = '<a href="{}">{}</a>'.format(url, object_link)
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except NoReverseMatch:
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pass
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return mark_safe(object_link)
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# 余秋玲: 设置对象链接的排序字段和描述
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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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# 余秋玲: 创建用户链接
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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))
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try:
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# 余秋玲: 尝试返回实际链接而不是对象字符串
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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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user_link = '<a href="{}">{}</a>'.format(url, user_link)
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except NoReverseMatch:
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pass
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return mark_safe(user_link)
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# 余秋玲: 设置用户链接的排序字段和描述
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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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# 余秋玲: 优化查询，预取关联的content_type
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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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# 余秋玲: 移除删除选中动作
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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']
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return actions
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