python - 坚持在Flask应用中实现Elasticsearch

Question

我目前正在研究Flask Mega-Tutorial(第XVI部分)，并且陷入了实现Elasticsearch的困境。具体来说，当从flask shell命令行运行以下命令时，出现此错误:

from app.search import add_to_index, remove_from_index, query_index
>>> for post in Post.query.all():
...     add_to_index('posts', post) 

AttributeError: module 'flask.app' has no attribute 'elasticsearch'

我应该提到的是，我没有实现上一课中的应用程序重组以使用蓝图。我的文件如下所示:

__init__.py:

#
from elasticsearch import Elasticsearch
app.elasticsearch = Elasticsearch([app.config['ELASTICSEARCH_URL']]) \
    if app.config['ELASTICSEARCH_URL'] else None

config.py:

class Config(object):
#
     ELASTICSEARCH_URL = 'http://localhost:9200'

search.py​​:

from flask import app

def add_to_index(index, model):
    if not app.elasticsearch:
        return
    payload = {}
    for field in model.__searchable__:
        payload[field] = getattr(model, field)
    app.elasticsearch.index(index=index, id=model.id, body=payload)

def remove_from_index(index, model):
    if not app.elasticsearch:
        return
    app.elasticsearch.delete(index=index, id=model.id)

def query_index(index, query, page, per_page):
    if not app.elasticsearch:
        return [], 0
    search = app.elasticsearch.search(
        index=index,
        body={'query': {'multi_match': {'query': query, 'fields': ['*']}},
              'from': (page - 1) * per_page, 'size': per_page})
    ids = [int(hit['_id']) for hit in search['hits']['hits']]
    return ids, search['hits']['total']['value']

我认为我没有将Elasticsearch正确导入到search.py​​中，但是由于上一课没有进行重组，因此我不确定如何表示它。有任何想法吗？

Answer 1

将其写入 search.py​​ 文件的正确方法应该是from flask import current_app