nickva opened a new pull request, #5310:
URL: https://github.com/apache/couchdb/pull/5310
Try to see what a simple selector-based views might look like. Inspired by
comments in the "allow_fallback" pr and the discussion in CouchDB dev meeting.
This is as simple as possible:
* We already have support for design doc languages, so go with that: use
"selector" as a language, then use the regular `_design/../_view` API
* `selector` picks documents to be indexed. The usual selector syntax,
nothing new
* `keys` - list of field values emitted as the key (an array)
* `values` - list of fields values emitted as the value (an array)
Example (DB=http://adm:[email protected]:15984)
```
echo "Recreating DB"
http -q delete $DB/db1
http -b put $DB/db1
echo "Adding some docs"
http -b put $DB/db1/a k:='1' v=x s:='10'
http -b put $DB/db1/b k:='3' v=x s:='11'
http -b put $DB/db1/c k:='4' v=y s:='12'
http -b put $DB/db1/d k:='2' v=x s:='13'
http -b put $DB/db1/e k:='5' v=x s:='14'
http -b put $DB/db1/f w:='1' v=x s:='15'
http -b put $DB/db1/g k:='3' o=o s:='16'
echo "Add two silly selector thingers"
http -b put $DB/db1/_design/s language=selector views:='{
"v1": {"map": {"selector": {"s":{"$gt":12}}, "keys":["k"],
"values":["v"]}},
"v2": {"map": {"keys":["w"]}}
}'
echo "Query the silly selector thinger"
http -b $DB/db1/_design/s/_view/v1
echo "Query the even sillier one without a selector"
http -b $DB/db1/_design/s/_view/v2
```
Query the silly selector thinger
```
{
"offset": 0,
"rows": [
{"id": "d", "key": [2], "value": ["x"]},
{"id": "e", "key": [5], "value": ["x"]}
],
"total_rows": 2
}
```
Query the even sillier one without a selector. Pick docs based on `keys`
only.
```
{
"offset": 0,
"rows": [
{"id": "f", "key": [1], "value": null}
],
"total_rows": 1
}
```
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