CouchDB View With OR Condition - database

Question

I have two kinds of documents in couchDB with following json type:
1.
{
"_id": "4a91f3e8-616a-431d-8199-ace00055763d",
"_rev": "2-9105188217acd506251c98cd4566e788",
"Vehicle": {
"type": "STRING",
"name": "Vehicle",
"value": "12345"
},
"Start": {
"type": "DATE",
"name": "Start",
"value": "2014-09-10T11:19:00.000Z"
}
}
2.
{
"_id": "4a91f3e8-616a-431d-8199-ace00055763d",
"_rev": "2-9105188217acd506251c98cd4566e788",
"Equipment": {
"type": "STRING",
"name": "Equipment",
"value": "12345"
},
"Start": {
"type": "DATE",
"name": "Start",
"value": "2014-09-10T11:19:00.000Z"
}
}
I want to make one view which search all these documents whose doc.Vehicle.value=12345 OR doc.Equipment.value=12345.
How can I make this view that will return all these kind of documents.
Thanks in advance.

Answer 1

Just emit both (yes, map functions may emits multiple times different key-values for the same doc) values with your view:
function(doc){
if (doc.Equipment) {
emit(doc.Equipment.value, null)
}
if (doc.Vehicle) {
emit(doc.Vehicle.value, null)
}
}
And request them by the same key:
http://localhost:5984/db/_design/ddoc/_view/by_equip_value?key="12345"
See also the Guide to Views for more info about CouchDB views.

Answer 2

With Kxepals Version, you cannot query the type of results ("12345" can be either Vehicle, OR Equipment). you can only see the result when you use "include_docs=true" and search inside the doc, or make a second query with the id of the results.
If you want to see the type (or Query by type) you need to extend the View :
..
if(doc.Equipment) {
emit (doc.Equipment.value,doc.Equipment.name);
}
if(doc.Vehicle) {
emit(doc.Vehicle.value,doc.Vehicle.name);
}
Here, the name is the value of the result rows.
But you can also define the results in the query, if you put the name as a first query item:
if(doc.Equipment) {
emit([doc.Equipment.name,doc.Equipment.value],null);
}
if(doc.Vehicle) {
emit ([doc.Vehicle.name,doc.Vehicle.value],null);
}
Here, the
Your Query for Vehicles:
/viewname?startkey=["Vehicle"]&Endkey=["Vehicle",{}]
Equipment:
/viewname?startkey=["Equipment"]&endkey=["Equipment,{}]
Here, the name is the first Item of the result rows key array.
Maybe this will help : http://de.slideshare.net/okurow/couchdb-mapreduce-13321353
BTW: Better solution would be :
{
"_id": "4a91f3e8-616a-431d-8199-ace00055763d",
"_rev": "2-9105188217acd506251c98cd4566e788",
"type": "Vehicle",
"value":"12345",
"Start": {
"type": "DATE",
"name": "Start", // ? maybe also obsolete, because already inside "Start" Element
"value": "2014-09-10T11:19:00.000Z"
}
}
{
"_id": "4a91f3e8-616a-431d-8199-ace00055763d",
"_rev": "2-9105188217acd506251c98cd4566e788",
"type": "Equipment",
"value":"12345",
"Start": {
"type": "DATE",
"name": "Start", // ? maybe also obsolete, because already inside "Start" Element
"value": "2014-09-10T11:19:00.000Z"
}
}
in this case you can use only one emit:
emit([doc.type,doc.value],null)