def get_mlt_query(
si: ExtraSolrInterface,
cd: CleanData,
facet: bool,
seed_pks: List[str],
filter_query: str,
) -> SolrResponse:
"""
By default Solr MoreLikeThis queries do not support highlighting. Thus, we
use a special search interface and build the Solr query manually.
:param si: SolrInterface
:param cd: Cleaned search form data
:param facet: Set to True to enable facets
:param seed_pks: List of IDs of the documents for that related documents
should be returned
:param filter_query:
:return: Executed SolrSearch
"""
hl_fields = list(SOLR_OPINION_HL_FIELDS)
# Exclude citations from MLT highlighting
hl_fields.remove("citation")
# Reset query for query builder
cd["q"] = ""
# Build main query as always
q = build_main_query(cd, facet=facet)
cleaned_fq = filter_query.strip()
q.update({
"caller": "mlt_query",
"q": "id:(" + (" OR ".join(seed_pks)) + ")",
"mlt": "true", # Python boolean does not work here
"mlt.fl": "text",
"mlt.maxqt": settings.RELATED_MLT_MAXQT,
"mlt.mintf": settings.RELATED_MLT_MINTF,
"mlt.minwl": settings.RELATED_MLT_MINWL,
"mlt.maxwl": settings.RELATED_MLT_MAXWL,
"mlt.maxdf": settings.RELATED_MLT_MAXDF,
# Retrieve fields as highlight replacement
"fl": q["fl"] + "," + (",".join(hl_fields)),
# Original query as filter query
"fq": q["fq"] + [cleaned_fq],
# unset fields not used for MLT
"boost": "",
"pf": "",
"ps": "",
"qf": "",
})
return si.mlt_query(hl_fields).add_extra(**q)
