Django HAYSTACK_REALTIME_SIGNAL_PROCESSOR

---

1. Enable real-time indexing of models

# settings.py
HAYSTACK_REALTIME_SIGNAL_PROCESSOR = True

2. Real-time update of search index when a model changes

# models.py
from haystack.signals import BaseSignalProcessor

class MySignalProcessor(BaseSignalProcessor):
    def update(self, sender, **kwargs):
        obj = kwargs['instance']
        index.update_object(obj)

# settings.py
HAYSTACK_SIGNAL_PROCESSOR = 'myproject.mymodule.MySignalProcessor'

3. Real-time update of search index when a model is deleted

def on_model_deleted(sender, instance, **kwargs):
    index.remove_object(instance)

4. Real-time update of search index on Django admin actions

from haystack.management.commands.update_index import Command as UpdateIndexCommand

def on_superuser_action(sender, **kwargs):
    action = kwargs['action']
    if action in ('delete', 'delete_selected'):
        models = kwargs['models']
        for model in models:
            UpdateIndexCommand().update_model(model)

5. Real-time update of search index on Django signals

from haystack.signals import index_updated

def on_index_updated(sender, **kwargs):
    print("Index updated:", kwargs['model'])

6. Real-time update of search index based on user permissions

def on_permissions_changed(sender, **kwargs):
    obj = kwargs['instance']
    if obj.has_perm('read'):
        index.update_object(obj)

7. Real-time update of search index based on custom conditions

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    if obj.is_published:
        index.update_object(obj)

8. Real-time update of search index with custom parameters

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, using='my_custom_index')

9. Real-time update of search index with custom priority

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, priority=1)

10. Real-time update of search index with custom backend

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, using='solr')

11. Real-time update of search index with custom callbacks

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, callback=lambda sender, instance, **kwargs: print(instance))

12. Real-time update of search index with multiple updates

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, using='my_custom_index', priority=1)

13. Real-time update of search index with custom transformers

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, transformers=[MyTransformer])

14. Real-time update of search index with custom context

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, context={'my_custom_data': 'value'})

15. Real-time update of search index with custom signal processors

class MySignalProcessor(BaseSignalProcessor):
    def update(self, sender, **kwargs):
        obj = kwargs['instance']
        index.update_object(obj)

# settings.py
HAYSTACK_SIGNAL_PROCESSOR = 'myproject.mymodule.MySignalProcessor'

16. Real-time update of search index with custom routers

class MyRouter(BaseSignalProcessor):
    def update(self, sender, **kwargs):
        obj = kwargs['instance']
        index.update_object(obj, using='my_custom_index')

# settings.py
HAYSTACK_SIGNAL_PROCESSOR = 'myproject.mymodule.MyRouter'

17. Real-time update of search index with custom indexes

class MyIndex(BaseIndex):
    def update(self, sender, **kwargs):
        obj = kwargs['instance']
        self.update_object(obj)

# settings.py
HAYSTACK_INDEXES = ['myproject.mymodule.MyIndex']

18. Real-time update of search index with multiple search engines

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, using=['my_custom_index1', 'my_custom_index2'])

19. Real-time update of search index with multiple backends

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, using=['solr', 'elasticsearch'])

20. Real-time update of search index with multiple indexes

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, using=['my_custom_index1', 'my_custom_index2'], index='my_custom_index3')

21. Real-time update of search index with multiple backends and indexes

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, using=['solr', 'elasticsearch'], index='my_custom_index')

22. Real-time update of search index with custom result handlers

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, result_handler=MyResultHandler)

23. Real-time update of search index with custom result managers

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, result_manager=MyResultManager)

24. Real-time update of search index with custom search models

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, search_model=MySearchModel)

25. Real-time update of search index with custom batch processors

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, batch_processor=MyBatchProcessor)

26. Real-time update of search index with custom commit processors

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    index.update_object(obj, commit_processor=MyCommitProcessor)

27. Real-time update of search index with custom per-model settings

from haystack import signals

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    if isinstance(obj, MyModel):
        index.update_object(obj, using='my_custom_index')

signals.post_save.connect(on_model_saved, dispatch_uid='myproject.mymodule.on_mymodel_saved')

28. Real-time update of search index with custom per-app settings

from haystack import signals

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    if obj._meta.app_label == 'myproject.myapp':
        index.update_object(obj, using='my_custom_index')

signals.post_save.connect(on_model_saved, dispatch_uid='myproject.mymodule.on_myapp_saved')

29. Real-time update of search index with custom per-site settings

from haystack import signals

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    if obj._meta.site.name == 'mysite':
        index.update_object(obj, using='my_custom_index')

signals.post_save.connect(on_model_saved, dispatch_uid='myproject.mymodule.on_mysite_saved')

30. Real-time update of search index with custom per-request settings

from django import middleware
from haystack import signals

class MyMiddleware(middleware.MiddlewareMixin):
    def process_request(self, request):
        if request.user.is_authenticated:
            signals.REALTIME_SIGNAL_PROCESSOR.update_settings(using='my_custom_index')

signals.post_save.connect(on_model_saved, dispatch_uid='myproject.mymodule.on_authenticated_user_saved')

31. Real-time update of search index with custom per-app settings and Middleware

from haystack import signals

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    if obj._meta.app_label == 'myproject.myapp' and user.is_authenticated:
        index.update_object(obj, using='my_custom_index')

signals.post_save.connect(on_model_saved, dispatch_uid='myproject.mymodule.on_myapp_saved_for_authenticated_user')

32. Real-time update of search index with custom per-app settings and Signal Processor

from haystack import signals

class MySignalProcessor(BaseSignalProcessor):
    def update(self, sender, **kwargs):
        obj = kwargs['instance']
        if isinstance(obj, MyModel) and user.is_authenticated:
            index.update_object(obj, using='my_custom_index')

# settings.py
HAYSTACK_SIGNAL_PROCESSOR = 'myproject.mymodule.MySignalProcessor'

33. Real-time update of search index with custom per-request settings and Signal Processor

from haystack import signals

class MySignalProcessor(BaseSignalProcessor):
    def update(self, sender, **kwargs):
        obj = kwargs['instance']
        request = kwargs['request']
        if isinstance(obj, MyModel) and request.user.is_authenticated:
            index.update_object(obj, using='my_custom_index')

# settings.py
HAYSTACK_SIGNAL_PROCESSOR = 'myproject.mymodule.MySignalProcessor'

34. Real-time update of search index with custom per-model settings, Middleware, and Signal Processor

from haystack import signals

def on_model_saved(sender, **kwargs):
    obj = kwargs['instance']
    request = kwargs['request']
    if isinstance(obj, MyModel) and request.user.is_authenticated:
        index.update_object(obj, using='my_custom_index')

class MySignalProcessor(BaseSignalProcessor):
    def update(self, sender, **kwargs):
        obj = kwargs['instance']
        request = kwargs['request']
        if isinstance(obj, MyModel) and request.user.is_authenticated:
            index.update_object(obj, using='my_custom_index')

# settings.py
HAYSTACK_SIGNAL_PROCESSOR = 'myproject.mymodule.MySignalProcessor'

35. Real-time update of search index with custom per-app settings, Middleware, and Signal Processor

from haystack import signals

class MySignalProcessor(BaseSignalProcessor):
    def update(self, sender, **kwargs):
        obj = kwargs['instance']
        request = kwargs['request']
        if obj._meta.app_label == 'myproject.myapp' and request.user.is_authenticated:
            index.update_object(obj, using='my_custom_index')

# settings.py
HAYSTACK_SIGNAL_PROCESSOR = 'myproject.mymodule.MySignalProcessor'

36. Real-time update of search index with custom per-site settings, Middleware, and Signal Processor

from haystack import signals

class MySignalProcessor(BaseSignalProcessor):
    def update(self, sender, **kwargs):
        obj = kwargs['instance']
        request = kwargs['request']
        if obj._meta.site.name == 'mysite' and request.user.is_authenticated:
            index.update_object(obj, using='my_custom_index')

# settings.py
HAYSTACK_SIGNAL_PROCESSOR = 'myproject.mymodule.MySignalProcessor'