According to this post http://www.metaltoad.com/blog/date-boosting-solr-drupal-search-results

then you need to add an extra []

$call_args['params']['freshness'][] = 'recip(abs(ms(NOW/HOUR,ds_changed)),3.16e-11,10,1)';

However after testing I still can get the result I want.

For example the value 3.16e-11,10 ; as far as I understand it means a year of milliseconds that gives a score of 10 inside that time span. and then decrease after.

For testing I used

call_args['params']['qf'][] = 'recip(abs(ms(NOW/HOUR,ds_changed)),86400000,21,1)';

which should give Posts added/changed on the day a score of 21 and then decreases daily.

Testing with 3 identical listings. And only title set at a boost rate over 1. I cannot get the articles to listing in date. order. Have i missed something obvious.

This module may be a solution https://www.drupal.org/project/search_api_sorts

Otherwise using you method above - According to this post http://www.metaltoad.com/blog/date-boosting-solr-drupal-search-results

then you need to add an extra []

$call_args['params']['freshness'][] = 'recip(abs(ms(NOW/HOUR,ds_changed)),3.16e-11,10,1)';

However after testing I still can get the result I want.

For example the value 3.16e-11,10 ; as far as I understand it means a year of milliseconds that gives a score of 10 inside that time span. and then decrease after.

For testing I used

call_args['params']['qf'][] = 'recip(abs(ms(NOW/HOUR,ds_changed)),86400000,21,1)';

which should give Posts added/changed on the day a score of 21 and then decreases daily.

Testing with 3 identical listings. And only title set at a boost rate over 1. I cannot get the articles to listing in date. order. Have i missed something obvious.

@orchid thank you for the reply. We have this issue on Search API Solr (https://www.drupal.org/project/search_api) and not the Apache Solr Search module(https://www.drupal.org/project/apachesolr); so I'm not 100% sure of the relevance of this reply to our issue.

According to this post http://www.metaltoad.com/blog/date-boosting-solr-drupal-search-results

then you need to add an extra []

$call_args['params']['freshness'][] = 'recip(abs(ms(NOW/HOUR,ds_changed)),3.16e-11,10,1)';

However after testing I still can get the result I want.

For example the value 3.16e-11,10 ; as far as I understand it means a year of milliseconds that gives a score of 10 inside that time span. and then decrease after.

For testing I used

call_args['params']['qf'][] = 'recip(abs(ms(NOW/HOUR,ds_changed)),86400000,21,1)';

which should give Posts added/changed on the day a score of 21 and then decreases daily.

Testing with 3 identical listings. And only title set at a boost rate over 1. I cannot get the articles to listing in date. order. Have i missed something obvious.