EdgeNgramField django haystack中的最小和最大字母

问题描述

有没有办法在django haystack索引中限制边缘数据的大小？例如，我创建的ngram如下：

Is there a way to restrict the size of the edge ngrams in django haystack indexing? For example, I create the ngram as follows:

#search_indexes.py
content_auto = indexes.EdgeNgramField(model_attr='name')

但是我不想创建2个字母的ngram，我其实是想设置在4或5的最小值。

But I don't want to create 2 letter ngrams, I actually want to set the min at 4 or 5.

作为背景，我正在使用django-haystack / elasticsearch，带有英文字母的盆景。

As background, I am using django-haystack/elasticsearch, with bonsai on heroku.

推荐答案

您需要做的是覆盖Haystack的ElasticSearch后端的搜索映射。

What you need to do is override the search mapping in Haystack's ElasticSearch backend.

简而言之：扩展ElasticSearch后端，并直接替换或通过 settings.py 导入新的架构映射。

In brief: extend the ElasticSearch backend and either replace directly or by a settings.py import a new schema mapping.

from django.conf import settings
from haystack.backends.elasticsearch_backend import (ElasticsearchSearchBackend,
    ElasticsearchSearchEngine)

class MyElasticBackend(ElasticsearchSearchBackend):

    def __init__(self, connection_alias, **connection_options):
        super(ConfigurableElasticBackend, self).__init__(
                                connection_alias, **connection_options)
        MY_SETTINGS = {
            'settings': {
                "analysis": {
                    "analyzer": {
                        "ngram_analyzer": {
                            "type": "custom",
                            "tokenizer": "lowercase",
                            "filter": ["haystack_ngram"]
                        },
                        "edgengram_analyzer": {
                            "type": "custom",
                            "tokenizer": "lowercase",
                            "filter": ["haystack_edgengram"]
                        }
                    },
                    "tokenizer": {
                        "haystack_ngram_tokenizer": {
                            "type": "nGram",
                            "min_gram": 3,
                            "max_gram": 15,
                        },
                        "haystack_edgengram_tokenizer": {
                            "type": "edgeNGram",
                            "min_gram": 2,
                            "max_gram": 15,
                            "side": "front"
                        }
                    },
                    "filter": {
                        "haystack_ngram": {
                            "type": "nGram",
                            "min_gram": 3,
                            "max_gram": 15
                        },
                        "haystack_edgengram": {
                            "type": "edgeNGram",
                            "min_gram": 5,
                            "max_gram": 15
                        }
                    }
                }
            }
        }
        setattr(self, 'DEFAULT_SETTINGS', MY_SETTINGS)


class ConfigurableElasticSearchEngine(ElasticsearchSearchEngine):
    backend = MyElasticBackend

有关更完整的说明，请参阅我的自定义搜索映射。

For a fuller explanation see my write up about extending the ElasticSearch backend to customize the search mapping.

这篇关于EdgeNgramField django haystack中的最小和最大字母的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！