# Django Haystack

***

**1. Simple Search Engine**

```python
from haystack.models import SearchIndex, Indexable

class ArticleIndex(Indexable, SearchIndex):
    text = fields.CharField(document=True, use_template=True)

# Register the index with Haystack
search_indexes.register(ArticleIndex)
```

**2. Custom Search Field**

```python
from haystack.fields import CharField
from haystack.indexes import Indexable

class ArticleIndex(Indexable):
    title = CharField(model_attr='title', boost=1.5)
```

**3. Filter Search Results**

```python
from haystack.query import SearchQuerySet

results = SearchQuerySet().filter(author__name='John Doe')
```

**4. Highlight Search Results**

```python
from haystack.utils import Highlighter

results = SearchQuerySet().highlight()
```

**5. Sort Search Results**

```python
from haystack.query import SearchQuerySet

results = SearchQuerySet().order_by('title')
```

**6. Autocomplete Search Results**

```python
from django.views.generic import TemplateView

class AutocompleteView(TemplateView):
    template_name = 'autocomplete.html'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['results'] = SearchQuerySet().autocomplete(self.request.GET.get('q'))
        return context
```

**7. Paginate Search Results**

```python
from haystack.query import SearchQuerySet

results = SearchQuerySet().facet('document_type').paginate(10, 1)
```

**8. Facet Search Results**

```python
from haystack.query import SearchQuerySet

results = SearchQuerySet().facet('document_type')
```

**9. Update Search Index**

```python
from haystack import indexes

ArticleIndex.objects.update_index()
```

**10. Reindex Search Index**

```python
from haystack import indexes

ArticleIndex.objects.rebuild()
```

**11. Clear Search Index**

```python
from haystack import indexes

ArticleIndex.objects.clear_index()
```

**12. Search with QSObject**

```python
from django.db.models import Q

results = SearchQuerySet().raw_search(Q(title='Django'))
```

**13. Search with Wildcard**

```python
results = SearchQuerySet().auto_query('wild*')
```

**14. Limit Search Fields**

```python
results = SearchQuerySet().fields('title', 'content')
```

**15. Exclude Search Fields**

```python
results = SearchQuerySet().excludes('title', 'content')
```

**16. Boost Search Results**

```python
results = SearchQuerySet().boost('title', 1.5)
```

**17. Manage Search Indices**

```python
from haystack.management.commands.rebuild_index import Command

Command().handle()
```

**18. Use Haystack with Django Channels**

```python
from haystack.backends.solr.backends import SolrSearchBackend

backend = SolrSearchBackend({'URL': 'http://localhost:8983/solr/haystack'})
```

**19. Use Haystack with ElasticSearch**

```python
from haystack.backends.elasticsearch.backends import ElasticsearchSearchBackend

backend = ElasticsearchSearchBackend({'URL': 'localhost:9200'})
```

**20. Custom Document Attribute**

```python
from haystack.fields import CharField

class Article(models.Model):
    title = models.CharField(max_length=255)

class ArticleIndex(indexes.SearchIndex, indexes.Indexable):
    text = CharField(document=True, use_template=True, template='search/article_snippet.txt')
```

**21. Custom Search Result Sorting**

```python
from haystack.indexes import Indexable

class ArticleIndex(Indexable):
    title = CharField()

    def prepare(self, obj):
        return {
            'title': obj.title,
            'order': obj.pk,
        }
```

**22. Custom Search Result Ordering**

```python
from haystack.indexes import Indexable

class ArticleIndex(Indexable):
    title = CharField()

    def prepare(self, obj):
        return {
            'title': obj.title,
            'order': -obj.pk,
        }
```

**23. Custom Search Result Faceting**

```python
from haystack.indexes import Indexable

class ArticleIndex(Indexable):
    title = CharField()

    def prepare(self, obj):
        return {
            'title': obj.title,
            'category': obj.category.name,
        }
```

**24. Search Result Excluding**

```python
from haystack.query import SearchQuerySet

results = SearchQuerySet().exclude('title')
```

**25. Search Result Aggregating**

```python
from haystack.query import SearchQuerySet

results = SearchQuerySet().aggregate('category')
```

**26. Search Result Highlighting**

```python
from haystack.utils import Highlighter

results = SearchQuerySet().highlight()
```

**27. Search Result Pagination**

```python
from haystack.query import SearchQuerySet

results = SearchQuerySet().paginate(10, 1)
```

**28. Search Result Limit**

```python
from haystack.query import SearchQuerySet

results = SearchQuerySet().limit(5)
```

**29. Search Result Sorting**

```python
from haystack.query import SearchQuerySet

results = SearchQuerySet().order_by('title')
```

**30. Search Result Case Sensitivity**

```python
from haystack.query import SearchQuerySet

results = SearchQuerySet().case_sensitive()
```

**31. Search Result Real-Time Indexing**

```python
from haystack.signals import index_saved

@index_saved.connect
def handle_saved_article(sender, instance, created, **kwargs):
    if created:
        instance.index_object()
```

**32. Search Result Document Identification**

```python
from haystack.indexes import Indexable

class ArticleIndex(Indexable):
    title = CharField()

    def prepare(self, obj):
        return {
            'title': obj.title,
            'django_object_id': obj.pk,
        }
```

**33. Search Result Date Filtering**

```python
from django.db.models import F

Article.objects.annotate(date_field=F('created_at').date()).filter(date_field=date)
```

**34. Search Result Language Filtering**

```python
from django.utils import translation

Article.objects.annotate(lang_field=F('language').code()).filter(lang_field=translation.get_language())
```

**35. Search Result Multi-Value Field Filtering**

```python
from haystack.query import SearchQuerySet

results = SearchQuerySet().filter(author_id__in=[1, 2, 3])
```

**36. Search Result Negative Filtering**

```python
from haystack.query import SearchQuerySet

results = SearchQuerySet().exclude(author_id=1)
```