# Django HAYSTACK\_REALTIME\_SIGNAL\_PROCESSOR

***

**1. Enable real-time indexing of models**

```python
# settings.py
HAYSTACK_REALTIME_SIGNAL_PROCESSOR = True
```

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

```python
# 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**

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

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

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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**

```python
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'

```