Google App Engine（python）：搜索API：字符串搜索 [英] Google App Engine (python) : Search API : String Search

问题描述

我正在使用Google App Engine搜索API（ https://developers.google.com/appengine/文档/蟒蛇/搜索/ ）。我索引了所有的实体，搜索工作正常。但只有当我搜索完全匹配时才返回0结果。例如：

  from google.appengine.api导入搜索
 
 _INDEX_NAME ='searchall'
 
 $ b $ query_string =United Kingdom
 query = search.Query（query_string = query_string）
 index = search.Index（name = _INDEX_NAME）
 
 print index.search（query）
  

如果我运行以下脚本，我会得到如下结果：

  search.SearchResults（results ='[search.ScoredDocument（doc_id ='c475fd24-34ba-42bd-a3b5-d9a48d880012' ，fields ='[search.TextField（name ='name'，value ='United Kingdom'））'，language ='en'，order_id ='45395666'），search.ScoredDocument（doc_id ='5fa757d1-05bf-4012 -93ff-79dd4b77a878'，fields ='[search.TextField（name ='name'，value ='United Kingdom'）]'，language ='en'，order_id ='45395201'）]'，number_found ='2' ）
  

但如果我将 query_string 更改为United Kin或United 它返回0结果如下：

  search.SearchResults（number_found ='0'）
  

我想将此API用于普通搜索和AutoSuggest。什么是最好的方式来实现这一目标？

解决方案

App Engine的全文搜索API不支持子字符串匹配。 >

但是，我自己需要这种行为来支持用户输入的搜索建议。这是我的解决方案：

接受一个句子并返回全部集合
例如，hello world变成he hell hell hell hello w wo wor worl world
def build_suggestions（str）：
suggestions = []
for word in str.split（）：
prefix =
for word in word：
prefix + = letter
suggestions.append（前缀）
return''.join（建议）

＃示例使用
document = search.Document（
fields = [search.TextField（name ='name'，value = object_name），
search.TextField（name ='suggest'，value = build_suggestions（object_name））]）


基本思路是为每个可能的子字符串手动生成单独的关键字。这只适用于简短的句子，但它适用于我的目的。

i am using the Google App Engine Search API (https://developers.google.com/appengine/docs/python/search/). I have indexed all of the entities and the search is working fine. but only if i search for the exact matches else it returns 0 results. For Example:

from google.appengine.api import search

_INDEX_NAME = 'searchall'


query_string ="United Kingdom"
query = search.Query(query_string=query_string)
index = search.Index(name=_INDEX_NAME)

print index.search(query)

if i run the following script i do get results as follows :

search.SearchResults(results='[search.ScoredDocument(doc_id='c475fd24-34ba-42bd-a3b5-d9a48d880012', fields='[search.TextField(name='name', value='United Kingdom')]', language='en', order_id='45395666'), search.ScoredDocument(doc_id='5fa757d1-05bf-4012-93ff-79dd4b77a878', fields='[search.TextField(name='name', value='United Kingdom')]', language='en', order_id='45395201')]', number_found='2')

but if i change the query_string to "United Kin" or "United" it return 0 results as follows:

search.SearchResults(number_found='0')

I want to use this API for both normal search and AutoSuggest. What would be the best way to achieve this ?

解决方案

App Engine's full text search API does not support substring matching.

However, I needed this behavior myself to support search suggestions as the user types. Here is my solution for that:

""" Takes a sentence and returns the set of all possible prefixes for each word.
    For instance "hello world" becomes "h he hel hell hello w wo wor worl world" """
def build_suggestions(str):
    suggestions = []
    for word in str.split():
        prefix = ""
        for letter in word:
            prefix += letter
            suggestions.append(prefix)
    return ' '.join(suggestions)

# Example use
document = search.Document(
    fields=[search.TextField(name='name', value=object_name),
            search.TextField(name='suggest', value=build_suggestions(object_name))])

The basic idea is to manually generate separate keywords for every possible substring. This is only practical for short sentences, but it works great for my purposes.

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