Grouped Result in Solr

Question

I have seen documentation mentioning Sitecore.ContentSearch.SolrNetExtension for Sitecore 9 indicating that its able to group results by a field (ie: _group field). What I am unable to find is a nice and easy way to do this in Sitecore 8. What I had hoped to achieve was to simply append

fq=group=true&group.field=_group&group.main=true

to the query as a FilterQuery. What I have tried thus far has been creating a custom QueryNode called GroupByField(keySelector) to inject a custom SolrQuery into the SolrQueryMapperState.FilterQuery with no luck. I have also tried to use the

.Filter(x => x["group"] == "true" && x["group.field"] == 
    BuildInFields.Group && x["group.main"] == "true")

But that yielded a no field group found which does make sense since it's not a field in the index itself.

TL;DR: Ultimately what I need is, when a User searches a keyword, the search is conducted across all languages and items, but only the items related to the results in the current languages are returned (if I put in a word that is found on the en-gb version of the item, I want the . I assumed this was what the group functionality in Solr was built for. At this point I am considering doing a self join, joining the non-grouped results and matching on the group of a language specific but am not sure that's going to be the solution either.

Answer 1

From what I read you dont want grouping (which would be for getting some results for EVERY language

Something like

context.GetQueryable<MySearchResultItem>().Where(item => item.Language
== context.Language)

If you have multiple "current languages" you should have an OR condition on the Where term for multiple languages.