Dataset count always shows as 0 on infrastructure list

[mark-saeon]

If a metadata record is assigned one or more infrastructures, then that record should contribute to the dataset count displayed for those infrastructure(s). Metadata records are (I believe) correctly linked to infrastructure groups via the member table in the backend. However, the package_search API that is called in the drill-down for infrastructure item display, which in turn calls Solr with the query parameter fq=u'+capacity:public groups:"infrastructure1"' (where "infrastructure1" is the name of the infrastructure in question), returns zero results.

[mark-saeon]

We should probably just write custom code to get the count of metadata records specifically, rather than relying on CKAN's built-in vanilla package stuff, since infrastructures are meant only to work with metadata records anyway.