我正在尝试查询Cloudant.com数据库(CouchDB)中的文档.以下两个查询请求分别正常工作:
{ "selector": { "some_field": "value_1" } }
{ "selector": { "some_field": "value_2" } }
Cloudant的文档似乎表明我应该能够将这两个查询组合成一个HTTP请求,如下所示:
{ "selector": { "$or": [ { "some_field": "value_1" },
{ "some_field": "value_2" } ] } }
但是当我尝试时,我收到以下回复:
{"error":"no_usable_index",
"reason":"There is no operator in this selector can used with an index."}
有人能告诉我我需要做些什么才能让它发挥作用?
最佳答案 目前似乎还没有办法通过Cloudant Query实现这一目标.但是,您可以使用通过Cloudant Query创建的索引来使用视图查询.假设索引位于名为ae97413b0892b3738572e05b2101cdd303701bb8的设计文档中:
curl -X POST \
'https://youraccount.cloudant.com/db/_design/ae97413b0892b3738572e05b2101cdd303701bb8/_view/ae97413b0892b3738572e05b2101cdd303701bb8?reduce=false&include_docs=true' \
-d '
{
"keys":[
["value_1"],
["value_2"]
]
}'
这会给你一个像这样的回复:
{
"total_rows": 3,
"offset": 1,
"rows": [
{
"id": "5fcec42ba5cad4fb48a676400dc8f127",
"key": [
"abc"
],
"value": null,
"doc": {
"_id": "5fcec42ba5cad4fb48a676400dc8f127",
"_rev": "1-0042bf88a7d830e9fdb0326ae957e3bc",
"some_field": "value_1"
}
},
{
"id": "955606432c9d3aaa48cab0c34dc2a9c8",
"key": [
"ghi"
],
"value": null,
"doc": {
"_id": "955606432c9d3aaa48cab0c34dc2a9c8",
"_rev": "1-68fac0c180923a2bf133132301b1c15e",
"some_field": "value_2"
}
}
]
}