Python Django通道非空约束失败:chat_chatmessage.message
我正在尝试在Django通道应用程序中完成通知系统 当我通过websocket发送消息或文本字符串时,Python Django通道非空约束失败:chat_chatmessage.message,python,django,django-views,django-channels,Python,Django,Django Views,Django Channels,我正在尝试在Django通道应用程序中完成通知系统 当我通过websocket发送消息或文本字符串时,websocket.recieve将在发送初始消息后生成大量空字符串 127.0.0.1:54917 - - [27/Apr/2019:19:04:05] "WSCONNECTING /messages/trilla" - - connected {'type': 'websocket.connect'} 127.0.0.1:54917 - - [27/Apr/2019:19:04:05] "W
websocket.recieve
将在发送初始消息后生成大量空字符串
127.0.0.1:54917 - - [27/Apr/2019:19:04:05] "WSCONNECTING /messages/trilla" - -
connected {'type': 'websocket.connect'}
127.0.0.1:54917 - - [27/Apr/2019:19:04:05] "WSCONNECT /messages/trilla" - -
receive {'type': 'websocket.receive', 'text': '{"message":"hi there"}'}
websocket.receive
receive {'type': 'websocket.receive', 'text': '{"message":""}'}
websocket.receive
receive {'type': 'websocket.receive', 'text': '{"message":""}'}
websocket.receive
receive {'type': 'websocket.receive', 'text': '{"message":""}'}
websocket.receive
导航栏有一个JS脚本,可以添加新的通知。从服务器消息构造html字符串,然后将其插入html页面
当我点击导航栏通知图标时,我得到的非空约束失败:chat\u chatmessage.message
。我假设是因为空字符串问题生成了大量空消息
这是我单击通知图标时的日志
receive {'type': 'websocket.receive', 'text': '{"type":"notification_read","username":{},"notification_id":{"jQuery33100053785670652706231":{"display":""}}}'}
websocket.receive
2019-04-28 11:59:47,041 ERROR Exception inside application: NOT NULL constraint failed: chat_chatmessage.message
很明显,数据传递不正确。我遵循了Django通道部分的教程,在尝试这么做之前没有使用JS/WebSockets的经验,因此我在查找问题代码方面的技能有限
消费者.py
async def websocket_receive(self, event):
# when a message is recieved from the websocket
print("receive", event)
message_type = event.get('type', None) #check message type, act accordingly
print(message_type)
if message_type == "notification_read":
# Update the notification read status flag in Notification model.
notification = Notification.object.get(id=notification_id)
notification.notification_read = True
notification.save() #commit to DB
print("notification read")
front_text = event.get('text', None)
if front_text is not None:
loaded_dict_data = json.loads(front_text)
msg = loaded_dict_data.get('message')
user = self.scope['user']
username = 'default'
notification_id = 'default'
if user.is_authenticated:
username = user.username
myResponse = {
'message': msg,
'username': username,
'notification': notification_id,
}
await self.create_chat_message(user, msg)
# broadcasts the message event to be sent, the group send layer
# triggers the chat_message function for all of the group (chat_room)
await self.channel_layer.group_send(
self.chat_room,
{
'type': 'chat_message',
'text': json.dumps(myResponse)
}
)
# chat_method is a custom method name that we made
async def chat_message(self, event):
# sends the actual message
await self.send({
'type': 'websocket.send',
'text': event['text']
})
async def websocket_disconnect(self, event):
# when the socket disconnects
print('disconnected', event)
@database_sync_to_async
def get_thread(self, user, other_username):
return Thread.objects.get_or_new(user, other_username)[0]
@database_sync_to_async
def create_chat_message(self, me, msg):
thread_obj = self.thread_obj
return ChatMessage.objects.create(thread=thread_obj, user=me, message=msg)
base.html
<script>
$(document).ready(function() {
$("#notificationLink").click(function() {
var data = {
"type": "notification_read",
"username": username,
"notification_id": notification_id,
}
socket.send(JSON.stringify(data));
$("#notificationContainer").fadeToggle(300);
$("#notification_id").fadeOut("slow");
return false;
});
</script>
<script>
// websocket scripts - client side*
var loc = window.location
var formData = $("#form")
var msgInput = $("#id_message")
var chatHolder = $('#chat-items')
var me = $('#myUsername').val()
var notification = $("#notificationLink")
var wsStart = 'ws://'
if (loc.protocol == 'https:') {
wsStart = 'wss://'
}
var endpoint = wsStart + loc.host + loc.pathname
var socket = new ReconnectingWebSocket(endpoint)
// below is the message I am receiving
socket.onmessage = function(e) {
var data = JSON.parse(event.data);
// Find the notification icon/button/whatever and show a red dot, add the notification_id to element as id or data attribute.
notification.append("<span id=#notification_id>" + notification.notification_id)
console.log("message", e)
var chatDataMsg = JSON.parse(e.data)
chatHolder.append('<li>' + chatDataMsg.message + ' from ' + chatDataMsg.username + '</li>')
}
// below is the message I am sending
socket.onopen = function(e) {
console.log("open", e)
formData.submit(function(event) {
event.preventDefault()
var msgText = msgInput.val()
var finalData = {
'message': msgText
}
socket.send(JSON.stringify(finalData))
formData[0].reset()
})
}
$(文档).ready(函数(){
$(“#notificationLink”)。单击(函数(){
风险值数据={
“类型”:“通知读取”,
“用户名”:用户名,
“通知id”:通知id,
}
send(JSON.stringify(data));
$(“通知容器”).fadeToggle(300);
$(“通知id”)。淡出(“缓慢”);
返回false;
});
//websocket脚本-客户端*
var loc=窗口位置
var formData=$(“#形式”)
var msgInput=$(“#id#u消息”)
var chatHolder=$(“#聊天项目”)
var me=$('#myUsername').val()
风险值通知=$(“#通知链接”)
var wsStart='ws://'
如果(loc.protocol==“https:”){
wsStart='wss://'
}
var endpoint=wsStart+loc.host+loc.pathname
var套接字=新的重新连接WebSocket(端点)
//下面是我收到的消息
socket.onmessage=函数(e){
var data=JSON.parse(event.data);
//找到通知图标/按钮/任何东西并显示一个红点,将通知id作为id或数据属性添加到元素中。
notification.append(“+notification.notification\u id)
控制台日志(“消息”,e)
var chatDataMsg=JSON.parse(e.data)
chatHolder.append(“”+chatDataMsg.message+”来自“+chatDataMsg.username+” ”)
}
//下面是我要传达的信息
socket.onopen=函数(e){
控制台日志(“打开”,e)
formData.submit(函数(事件){
event.preventDefault()
var msgText=msgInput.val()
var finalData={
“消息”:msgText
}
socket.send(JSON.stringify(finalData))
formData[0]。重置()
})
}
导航栏
<li id="notification_li" class="nav-item">
<a class="nav-link" href="#" id="notificationLink">
<i class="fas fa-envelope"></i> Inbox</a>
{% for notifications in notification %}
<span id="notification_id{{notification_id}}">{{ notifications.notification_chat }}</span>
{% endfor %}
<div id="notificationContainer">
<div id="notificationTitle">Notifications</div>
<div id="notificationsBody" class="notifications">
{% for notifications in notification %}
<a href="{% url 'chat:thread' user %}">
<span id="notification-{{notification.id}}">
{{ notifications.notification_chat.message }}
via {{ notifications.notification_chat.user }}
at {{ notifications.notification_chat.thread.timestamp }}
</span>
</a>
...
{%用于通知%中的通知}
{{notifications.notification_chat}}
{%endfor%}
通知
{%用于通知%中的通知}
...
问题应该来自您的模型文件。非空
约束是在一个字段上设置的,当您试图将其创建为空时,该字段会引发错误。因此,要解决这个问题,您需要设置空=真
。
例如:
date_of_birth = models.DateField(blank=True, null=True)
尝试查看
create\u chat\u message
函数中使用的模型。问题应该来自模型文件。NOT NULL
约束设置在一个字段上,该字段在您尝试将其创建为空时会引发错误。因此,为了克服此问题,您需要设置NULL=True
。
例如:
date_of_birth = models.DateField(blank=True, null=True)
尝试查看
create\u chat\u message
功能中使用的型号。当您发送通知时,您不需要所有的rest代码,因此您可以简单地添加return
if message_type == "notification_read":
# Update the notification read status flag in Notification model.
notification = Notification.object.get(id=notification_id)
notification.notification_read = True
notification.save() #commit to DB
print("notification read")
return
如果消息类型==“通知读取”:
#更新通知模型中的通知读取状态标志。
notification=notification.object.get(id=notification\u id)
notification.notification\u read=True
通知。保存()#提交到数据库
打印(“通知已读”)
return
当您发送的通知被读取时,您不需要所有的rest代码,因此您可以简单地添加return
if message_type == "notification_read":
# Update the notification read status flag in Notification model.
notification = Notification.object.get(id=notification_id)
notification.notification_read = True
notification.save() #commit to DB
print("notification read")
return
如果消息类型==“通知读取”:
#更新通知模型中的通知读取状态标志。
notification=notification.object.get(id=notification\u id)
notification.notification\u read=True
通知。保存()#提交到数据库
打印(“通知已读”)
return
@BearBrown你好,有什么想法吗?你好,我现在正在读,你还需要帮助吗?看起来@
只有在我添加一些评论时才有效,否则我不会收到任何通知。创建聊天信息
里面有什么代码?嗨@BearBrown创建聊天信息
里面的代码在上面我不知道在问题中看到它,我认为问题可能就在它里面。@BearBrown嗨,有什么想法吗?嗨,我现在正在读,你还需要帮助吗?而且看起来@
只有在我添加一些注释时才起作用,否则我不会收到任何通知。创建聊天信息
里面有什么代码?嗨@BearBrown代码在里面ecreate\u chat\u message
在上面,我在问题中没有看到它,我认为问题可能就在它里面。嗨,我不想在消息上设置null=True
,因为这样它将允许发送空白消息,我不想这样做?好的,所以你想阻止它发送空白消息。是的,我正在试图找出原因hy,因为当我硬刷新页面时,websocket.receive
不会发送任何空白消息。但是,我发送的消息越多,空白消息就越多。嗨,我不想在消息上设置null=True
,因为这样它将允许发送空白消息,我不想这样做?好的,那么你想继续吗阻止它发送空白消息。是