由于 Django Haystack 中的分页，对后端的多个请求答案

【问题标题】：Multiple requests to backend because of Pagination in Django Haystack由于 Django Haystack 中的分页，对后端的多个请求
【发布时间】：2015-07-22 08:24:05
【问题描述】：

我使用 Elasticsearch 作为我的后端。

在我的一个观点中，我做了一个这样的过滤器：

SearchQuerySet().filter(...)

它返回，比如说，55 个对象。

然后，我在 for 循环中迭代结果以对每个对象执行一些操作。

结果符合预期。但是，当我查看 elasticsearch 的日志时，我会看到如下内容：

[12:38:16,504] {"time":"2015-07-22T12:38:16.504+05:00","starttime":"2015-07-22T12:38:16.502+05:00","localaddr":"127.0.0.1","localport":9200,"remoteaddr":"127.0.0.1","remoteport":58718,"scheme":"http","method":"GET","path":"/haystack/modelresult/_search","querystr":"_source=true","code":200,"status":"OK","size":13633,"duration":2,"year":"2015","month":"07","day":"22","hour":"12","minute":"38","dow":"Wed","cluster":"elasticsearch_venta","data":"{\"query\": {\"filtered\": {\"filter\": {\"terms\": {\"django_ct\": [\"items.item\"]}}, \"query\": {\"match_all\": {}}}}, \"from\": 0, \"size\": 10}"}
[12:38:16,509] {"time":"2015-07-22T12:38:16.509+05:00","starttime":"2015-07-22T12:38:16.508+05:00","localaddr":"127.0.0.1","localport":9200,"remoteaddr":"127.0.0.1","remoteport":58718,"scheme":"http","method":"GET","path":"/haystack/modelresult/_search","querystr":"_source=true","code":200,"status":"OK","size":13719,"duration":1,"year":"2015","month":"07","day":"22","hour":"12","minute":"38","dow":"Wed","cluster":"elasticsearch_venta","data":"{\"query\": {\"filtered\": {\"filter\": {\"terms\": {\"django_ct\": [\"items.item\"]}}, \"query\": {\"match_all\": {}}}}, \"from\": 10, \"size\": 10}"}
[12:38:16,515] {"time":"2015-07-22T12:38:16.515+05:00","starttime":"2015-07-22T12:38:16.513+05:00","localaddr":"127.0.0.1","localport":9200,"remoteaddr":"127.0.0.1","remoteport":58718,"scheme":"http","method":"GET","path":"/haystack/modelresult/_search","querystr":"_source=true","code":200,"status":"OK","size":13429,"duration":2,"year":"2015","month":"07","day":"22","hour":"12","minute":"38","dow":"Wed","cluster":"elasticsearch_venta","data":"{\"query\": {\"filtered\": {\"filter\": {\"terms\": {\"django_ct\": [\"items.item\"]}}, \"query\": {\"match_all\": {}}}}, \"from\": 20, \"size\": 10}"}

也就是说，SearchQuerySet 每次返回 10 个项目。

我尝试了load_all，但没有帮助。

我认为这是因为 SearchQuerySet 返回了分页结果。

如何将 elasticsearch 的请求数量减少到一个，即一次获取所有项目？

【问题讨论】：

标签： python django elasticsearch pagination django-haystack

【解决方案1】：

在 SearchView 中将 results_per_page 设置为 None。 SearchView 在官方 repo 中定义如下：

class SearchView(object):
    ...
    results_per_page = RESULTS_PER_PAGE

【讨论】：

我没有进行搜索。我正在使用 SearchQuerySet() 进行过滤:(

【解决方案2】：

SearchQuerySet().filter(...).query.get_results()

【讨论】：