elasticsearch搜索提示

elasticsearch搜索提示（补全）接口需要新增suggest字段并设type为:completion,结合到scrapy,修改es_types.py文件:

from datetime import datetime
from elasticsearch_dsl import DocType, Date, Nested, Boolean, analyzer, InnerObjectWrapper, Completion, Keyword, Text, Integer
from elasticsearch_dsl.connections import connections
connections.create_connection(hosts=['localhost'])
class ArticleType(DocType):
    #文章类型
    suggest = Completion(analyzer="ik_max_word") #这样做由于原码问题这里会报错
    title = Text(analyzer="ik_max_word")
    create_date = Date()
    praise_nums = Integer()
    fav_nums = Integer()
    comment_nums = Integer()
    tags = Text(analyzer="ik_max_word")
    front_image_url = Keyword()
    url_object_id = Keyword()
    front_image_path = Keyword()
    url = Keyword()
    content = Text(analyzer="ik_max_word")

    class Meta:
        index = 'jobbole'
        doc_type = 'article'
if __name__ == '__main__':
    ArticleType.init()

解决办法：自定义CustomAnalysis类，继承自elasticsearch_dsl.analysis下的CustomAnalysis类：

from datetime import datetime
from elasticsearch_dsl import DocType, Date, Nested, Boolean, 
    analyzer, InnerObjectWrapper, Completion, Keyword, Text, Integer

from elasticsearch_dsl.analysis import CustomAnalyzer as _CustomAnalyzer

from elasticsearch_dsl.connections import connections
connections.create_connection(hosts=["localhost"])

class CustomAnalyzer(_CustomAnalyzer):
    def get_analysis_definition(self):
        return {}

ik_analyzer = CustomAnalyzer("ik_max_word", filter=["lowercase"])#大小写转换（搜索时忽略大小写影响）
class ArticleType(DocType):
    #伯乐在线文章类型
    suggest = Completion(analyzer=ik_analyzer)
    title = Text(analyzer="ik_max_word")
    create_date = Date()
    url = Keyword()
    url_object_id = Keyword()
    front_image_url = Keyword()
    front_image_path = Keyword()
    praise_nums = Integer()
    comment_nums = Integer()
    fav_nums = Integer()
    tags = Text(analyzer="ik_max_word")
    content = Text(analyzer="ik_max_word")

    class Meta:
        index = "jobbole"
        doc_type = "article"

if __name__ == "__main__":
    ArticleType.init()

在item中生成搜索建议词：

from spider.models.es_types import ArticleType
from elasticsearch_dsl.connections import connections
es = connections.create_connection(ArticleType._doc_type.using)
def gen_suggests(index, info_tuple):
    #根据字符串生成搜索建议数组
    used_words = set() #set为去重功能
    suggests = []
    for text, weight in info_tuple:
        if text:
            #字符串不为空时，调用elasticsearch的analyze接口分析字符串（分词、大小写转换）
            words = es.indices.analyze(index=index, analyzer="ik_max_word", params={'filter':["lowercase"]}, body=text)
            anylyzed_words = set([r["token"] for r in words["tokens"] if len(r["token"])>1])
            new_words = anylyzed_words - used_words
        else:
            new_words = set()

        if new_words:
            suggests.append({'input': list(new_words), 'weight': weight})
    return suggests


class JobboleArticleItem(scrapy.Item):
    title = scrapy.Field()
    create_date = scrapy.Field(input_processor=MapCompose(date_convert))
    praise_nums = scrapy.Field(input_processor=MapCompose(number_convert))
    fav_nums = scrapy.Field(input_processor=MapCompose(number_convert))
    comment_nums = scrapy.Field(input_processor=MapCompose(number_convert))
    tags = scrapy.Field(input_processor=MapCompose(remove_comment_tags), output_processor=Join(','))
    front_image_url = scrapy.Field(output_processor=MapCompose(returnValue))
    url_object_id = scrapy.Field(input_processor=MapCompose(get_md5))
    front_image_path = scrapy.Field()
    url = scrapy.Field()
    content = scrapy.Field()

def save_to_elasticsearch(self):
        article = ArticleType()
        article.title = self['title']
        article.create_date = self['create_date']
        article.content = remove_tags(self['content'])  # remove_tags()去除html标签
        article.front_image_url = self['front_image_url']
        if 'front_image_path' in self:
            article.front_image_path = self['front_image_path']
        article.praise_nums = self['praise_nums']
        article.fav_nums = self['fav_nums']
        article.comment_nums = self['comment_nums']
        article.url = self['url']
        article.tags = self['tags']
        article.meta.id = self['url_object_id']

        #生成搜索建议词
        article.suggest = gen_suggests(ArticleType._doc_type.index, ((article.title, 10), (article.tags, 7)))
        article.save()  # 保存
        return