gistfile1.js

function cron_analyze_users(){
    var subject = storage.users.sort(lastAnalyzed).first()
    
    var interests = []
    storage.interests.filter({user:subject,relevant:true}).forEach(function(i){
        interests[i.term.string] = i.difference
    })

    var analyzed = []
    storage.relations.filter({subject:subject}).forEach(function(r){
        analyzed[r.object.id] = r.analyzed
    })
    storage.users.sort(function(a,b){
        if(!analyzed[a.id] && analyzed[b.id]) return 1
        else if(analyzed[a.id] && !analyzed[b.id]) return -1
        else if(analyzed[a.id] && analyzed[b.id]) return analyzed[a.id] - analyzed[b.id]
        else return a.created - b.created
    }).limit(20).forEach(function(object){
        if(object.email != subject.email){
            relation = storage.relations.filter({subject:subject, object:object}).first()
            if(!relation) relation = storage.relations.add({subject:subject, object:object})
            conrelation = storage.relations.filter({subject:object, object:subject}).first()
            if(!conrelation) conrelation = storage.relations.add({subject:object, object:subject})
            
            relation.euclidean = euclidean(subject, object, interests)
            conrelation.euclidean = relation.euclidean
            
            relation.analyzed = new Date()
            conrelation.analyzed = new Date()
        }
    })
    subject.analyzed = new Date()
}
function euclidean(subject, object, interests){
    sum = 0
    storage.interests.filter({user:object,relevant:true}).forEach(function(i){
        if(interests[i.term.string]){
            sum += Math.pow(interests[i.term.string] - i.difference, 2)
        }
    })
    if(sum) return 1/(1+Math.sqrt(sum))
    else return false
}