El principal problema és que Elasticsearch no té una manera nativa d'obtenir una llista de tots els documents d'un índex determinat. Podeu utilitzar l'API de cerca, però només retornarà un document alhora.
Estic fent servir django-elasticsearch-dsl i vull obtenir una llista de tots els documents a l'índex. Com ho puc fer?
A:
Podeu utilitzar el Search objecte de django_elasticsearch_dsl. És una subclasse de la ElasticsearchDSL Objecte de cerca, de manera que també podeu utilitzar tots els mètodes des d'allà. Els documents per a això es troben aquí: https://elasticsearch-dsl.readthedocs.io/en/latest/search_dsl.html#the-search-object
Obtenció de tots els documents
<code>from django_elasticsearch_dsl import Search, Indexs = Search(index='blog')
.query('match', title='python')response = s.execute()
for hit in response: # iterate over hits from response object
print(hit) # print each hit as a dict (default)for hit in s: # iterate over hits from search query directly
print(hit) # print each hit as a dict (default)for hit in s[0:10]: # slice results to get only first 10 hits
print(hit) # print each hit as a dict (default)len(s) # number of total hits found by query (slow!) <--- this is what you want! <--- this is what you want! <--- this is what you want! <--- this is what you want! <--- this is what you want! len(response) # number of total hits found by query (slow!) <--- this is what you want! <--- this is what you want! <--- this is what you want! <--- this is what you want! list(s)[0] # first result as a Python dictionary list(response)[0] # first result as a Python dictionary response[0] # first result as an ElasticSearch Hit response[0].meta # metadata associated with the Hit response[0].meta.score # score associated with the Hit response[0].title # title field value list(response)[1]['title'] ## second result's 'title' field value<;/pre>;<;br />;>;br />;The above code will return all documents matching your query, but it will not return any fields other than _id and _type unless they are explicitly requested via source(). To retrieve more fields, use source():<;br />;from django_elasticsearch_dsl import Search, Index, F ;from elasticsearch_dsl import Q ;import json ;import pprint ;pp = pprint.PrettyPrinter();pprint = pp.pprint ;s = Search().query('match', title='python').source([ 'title', 'body' ]) ;for i in range((len(s))): pprint((json.loads((str)(s[i]).replace("'", """)))) ;## or simply do it like below :## [{'body': 'Python and Django go together like peanut butter and jelly.'
