Google App Engine (python):搜索 API:字符串搜索

问题描述：

我正在使用 Google App Engine Search API (https://developers.google.com/appengine/docs/python/search/).我已经索引了所有实体并且搜索工作正常.但只有当我搜索完全匹配时，它才会返回 0 个结果.例如:

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)

如果我运行以下脚本，我会得到如下结果:

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')

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

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

search.SearchResults(number_found='0')

我想将此 API 用于普通搜索和 AutoSuggest.实现这一目标的最佳方法是什么?

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

答

App Engine 的全文搜索 API 不支持子字符串匹配.

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

但是，我自己需要这种行为来支持用户键入时的搜索建议.这是我的解决方案:

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))])

基本思想是为每个可能的子字符串手动生成单独的关键字.这仅适用于短句，但对我的目的非常有用.

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.

Google App Engine (python):搜索 API:字符串搜索

相关推荐