74 lines
2.6 KiB
Python
74 lines
2.6 KiB
Python
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# apps/chat/models.py
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from django.db import models
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from django.utils import timezone
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import uuid
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from itertools import count
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from apps.user.models import User
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class ChatHistory(models.Model):
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"""聊天历史记录"""
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ROLE_CHOICES = [
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('user', '用户'),
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('assistant', 'AI助手'),
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('system', '系统')
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]
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user = models.ForeignKey(User, on_delete=models.CASCADE)
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# 改为使用字符串字段而非外键关联
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knowledge_base_id = models.CharField(max_length=100, default="b680a4fa-37be-11f0-a7cb-0242ac120002", help_text="知识库ID，用于兼容原有结构")
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# 用于标识知识库组合的对话
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conversation_id = models.CharField(max_length=100, db_index=True)
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# 对话标题
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title = models.CharField(max_length=100, null=True, blank=True, default='New chat', help_text="对话标题")
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parent_id = models.CharField(max_length=100, null=True, blank=True)
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role = models.CharField(max_length=20, choices=ROLE_CHOICES)
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content = models.TextField()
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tokens = models.IntegerField(default=0, help_text="消息token数")
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# 扩展metadata字段
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metadata = models.JSONField(default=dict, blank=True, help_text="存储额外信息")
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created_at = models.DateTimeField(auto_now_add=True)
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is_deleted = models.BooleanField(default=False)
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class Meta:
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ordering = ['created_at']
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indexes = [
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models.Index(fields=['conversation_id', 'created_at']),
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models.Index(fields=['user', 'created_at']),
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models.Index(fields=['conversation_id', 'is_deleted']),
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]
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def __str__(self):
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return f"{self.user.email} - {self.title} - {self.created_at}"
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@classmethod
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def get_conversation(cls, conversation_id):
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"""获取完整对话历史"""
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return cls.objects.filter(
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conversation_id=conversation_id,
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is_deleted=False
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).order_by('created_at')
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@classmethod
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def get_conversations_by_user(cls, user):
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"""根据用户获取对话历史"""
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return cls.objects.filter(
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user=user,
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is_deleted=False
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).order_by('created_at')
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def soft_delete(self):
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"""软删除消息"""
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self.is_deleted = True
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self.save()
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def to_dict(self):
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"""转换为字典格式"""
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return {
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'id': str(self.id),
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'conversation_id': self.conversation_id,
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'role': self.role,
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'content': self.content,
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'created_at': self.created_at.strftime('%Y-%m-%d %H:%M:%S'),
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'metadata': self.metadata
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}
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