How to combine multiple CouchDB queries into a single request? - couchdb

Question

I'm trying to query documents in a Cloudant.com database (CouchDB). The two following query requests work fine separately:
{ "selector": { "some_field": "value_1" } }
{ "selector": { "some_field": "value_2" } }
Cloudant's documentation seems to indicate I should be able to combine those two queries into a single HTTP request as follows:
{ "selector": { "$or": [ { "some_field": "value_1" },
{ "some_field": "value_2" } ] } }
But when I try that I receive the following response:
{"error":"no_usable_index",
"reason":"There is no operator in this selector can used with an index."}
Can someone tell me what I need to do to get this to work?

Answer 1

There doesn't seem to be a way to achieve this with Cloudant Query at the moment. However, you can use a view query instead using the index created with Cloudant Query. Assuming the index is in a design document named ae97413b0892b3738572e05b2101cdd303701bb8:
curl -X POST \
'https://youraccount.cloudant.com/db/_design/ae97413b0892b3738572e05b2101cdd303701bb8/_view/ae97413b0892b3738572e05b2101cdd303701bb8?reduce=false&include_docs=true' \
-d '
{
"keys":[
["value_1"],
["value_2"]
]
}'
This will give you a response like this:
{
"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"
}
}
]
}