I find myself using a lot this kind of functions (this one
inspired/borrowed from Sean Cribbs) - a sort of SQL's conditions
("where").
Riak.mapByFields = function(value, keyData, fields) {
if(!value.not_found){
var object = Riak.mapValuesJson(value)[0];
for(field in fields) {
if(object[field] != fields[field])
return [];
}
return [object];
} else {
return [];
}
}
Usage:
{"inputs":"test",
"query":[{"map":{"language":"javascript",
"name":"Riak.mapByFields",
"arg": { "city": "Paris" },
"keep":true}}]
}
Any real-world app *always* needs to query data by fields.
Would it be a good idea to ship this by default in Riak? I do believe
so because it is sufficiently general purpose (just as
Riak.mapValuesJson).
A lot of libraries (for instance devise-ripple) could build upon this
function without forcing clients/users to alter their app.config,
define a js_source, and include the function in all their nodes.
What do you think?
Francisco
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