Hi,
I want to do a similar sorting function query to the way reddit handles its
ranking.
I have the date stored in a
<fieldType name="tdate" class="solr.TrieDateField" omitNorms="true"
precisionStep="6" positionIncrementGap="0"/>
I also have the number of twitter, facebook and reads from our site stored.
below is the pseudo code that I want to work out.
var t = (CreationDate - 1131428803) / 1000;
var x = FacebookCount + TwitterCount + VoteCount - DownVoteCount;
var y = 0;
if (x > 0) {
y = 1;
} else if (x == 0) {
y = 0;
} else if (x < 0) {
y = -1;
}
var z = 1;
var absX = Math.abs(x);
if (absX >= 1) {
z = absX;
}
var ranking = (Math.log(z) / Math.LN10) + ((y * t) / 45000);
I have no Java experience so I cannot re-write it as a custom function.
This is my current query I am trying to use.
http://127.0.0.1:8983/solr/select?q.alt=*:*&fq=content_type:news&start=0&rows=10&wt=json&indent=on&omitHeader=true
&fl=id,name,excerpt,timestamp,domain,source,facebook,twitter,read,imageheight
&defType=dismax
&tt=div(sub(_val_:timestamp,1131428803),1000)
&xx=sub(sum(facebook,twitter,read),0)
&yy=map(query($xx),1,99999999,1,map(query($xx),0,0,0,map(query($xx),-99999999,-1,-1,0)))
&zz=map(abs(query($xx)),-999999999,0,1)
&sort=sum(div(log(query($zz)),ln(10)),div(product(query($yy),query($tt)),45000))
desc
Currently I am getting errors relating to my date field when trying to
convert it from the TrieDate to timestamp with the _val_:MyDateField.
Also I wanted to know if their is another way to do this? If my query is
even correct.
Thanks in advance
Richard
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