Django 1.11.3无Request批量操作Session及预配置技术问询

Hey there, let's break down your two Django Session questions specifically for your setup (Django 1.11.3 + Python 3.5):

问题1：无Request时通过用户ID/手机号访问并修改Session #

Django stores session data in the django_session database table, and you can directly interact with the Session model to access sessions without a request object. Here's how to do it:

Step 1: Retrieve sessions linked to a user ID #

By default, Django stores the authenticated user's ID in the session under the key _auth_user_id. We'll need to deserialize the stored session data (since it's pickled by default in Django 1.11) to check this value:

from django.contrib.sessions.models import Session
from django.contrib.sessions.serializers import PickleSerializer
from django.utils import timezone

def get_user_sessions(user_id):
    # Filter only active (non-expired) sessions
    active_sessions = Session.objects.filter(expire_date__gt=timezone.now())
    serializer = PickleSerializer()
    user_sessions = []
    
    for session in active_sessions:
        try:
            # Deserialize the session data
            session_data = serializer.loads(session.session_data)
            # Check if this session belongs to the target user
            if session_data.get('_auth_user_id') == str(user_id):
                user_sessions.append((session, session_data))
        except Exception:
            # Skip corrupted/invalid sessions
            continue
    return user_sessions

Step 2: Modify sessions to add your list field #

Once you have the user's sessions, you can add the new field and save the updated session data:

# Example: Get sessions for user with ID 123
user_sessions = get_user_sessions(123)
serializer = PickleSerializer()

for session, data in user_sessions:
    # Add the new list field (initialize as empty if not exists)
    data.setdefault('my_custom_list', [])
    # Optional: Populate the list with initial values
    # data['my_custom_list'] = ['item1', 'item2']
    
    # Serialize the updated data and save the session
    session.session_data = serializer.dumps(data)
    session.save()

Step 3: Access via phone number #

If you need to target users by phone number, first fetch the user object using the phone field, then use their ID to find sessions:

from django.contrib.auth.models import User  # Or your custom user model

# Replace with your user model's phone field lookup
target_user = User.objects.get(phone='1234567890')
user_sessions = get_user_sessions(target_user.id)
# Proceed to modify sessions as above

问题2：在Request发起前设置Session的格式 #

If you want to ensure sessions have a consistent structure (like your new list field) from the moment they're created, here are two reliable approaches for Django 1.11:

Option 1: Custom Session Initialization Middleware #

Create a middleware that runs after Django's SessionMiddleware to set default values when a session is first created:

# myapp/middleware.py
from django.utils.deprecation import MiddlewareMixin

class SessionStructureMiddleware(MiddlewareMixin):
    def process_request(self, request):
        # Check if the session is new or missing our custom field
        if not request.session.get('my_custom_list'):
            # Initialize the list field as empty
            request.session['my_custom_list'] = []

Then add this middleware to your settings.py after Django's SessionMiddleware:

# settings.py
MIDDLEWARE = [
    # ... other middleware ...
    'django.contrib.sessions.middleware.SessionMiddleware',
    'myapp.middleware.SessionStructureMiddleware',  # Add your middleware here
    # ... other middleware ...
]

Option 2: Use the User Login Signal #

If you only need to set the session structure when a user logs in, hook into Django's user_logged_in signal:

# myapp/signals.py
from django.contrib.auth.signals import user_logged_in
from django.dispatch import receiver

@receiver(user_logged_in)
def init_session_on_login(sender, request, user, **kwargs):
    # Set default list field if it doesn't exist
    if 'my_custom_list' not in request.session:
        request.session['my_custom_list'] = []

Don't forget to register the signals in your app's apps.py:

# myapp/apps.py
from django.apps import AppConfig

class MyAppConfig(AppConfig):
    name = 'myapp'
    
    def ready(self):
        import myapp.signals

And update settings.py to use your custom AppConfig:

# settings.py
INSTALLED_APPS = [
    # ...
    'myapp.apps.MyAppConfig',  # Replace 'myapp' with your app name
    # ...
]

内容的提问来源于stack exchange，提问作者zephyr.mao