More like this¶

Usage example¶

Sample view¶

from django_elasticsearch_dsl_drf.filter_backends import (
    FilteringFilterBackend,
    IdsFilterBackend,
    OrderingFilterBackend,
    PostFilterFilteringFilterBackend,
    SearchFilterBackend,
)
from django_elasticsearch_dsl_drf.viewsets import (
    DocumentViewSet,
    MoreLikeThisMixin,
)

class BookMoreLikeThisDocumentViewSet(DocumentViewSet,
                                      MoreLikeThisMixin):
    """Same as BookDocumentViewSet, with more-like-this and no facets."""

    filter_backends = [
        # ...
        FilteringFilterBackend,
        PostFilterFilteringFilterBackend,
        IdsFilterBackend,
        OrderingFilterBackend,
        SearchFilterBackend,
        # ...
    ]

    # More-like-this options
    more_like_this_options = {
        'fields': (
            'title.mlt',
            'summary.mlt',
            'description.mlt',
        )
    }

Sample request¶

http://localhost:8000/search/books-more-like-this-no-options/1007587/more_like_this/

Generated query¶

{
  "query": {
    "more_like_this": {
      "fields": [
        "title.mlt",
        "summary.mlt",
        "description.mlt"
      ],
      "like": {
        "_index": "book",
        "_id": "1007587",
        "_type": "book_document"
      }
    }
  },
  "from": 0,
  "size": 14,
  "sort": [
    "_score"
  ]
}

Options¶

Pretty much all more-like-this options available in Elasticsearch. You might be particularly interested in the following:

min_term_freq
max_query_terms
unlike
stop_words