[SOLR-7097] Update other Document in DocTransformer

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Labels: searcher transformers
• Assignee: Unassigned
• Reporter: jefferyyuan
• Created: 11/Feb/15 03:26
• Updated: 20/Feb/15 05:26

Description

Solr DocTransformer is good, but it only allows us to change current document: add or remove, update fields.

It would be great if we can update other document(previous especially) , or better we can delete doc(especially useful during test) or add doc in DocTransformer.

User case:
We can use flat group mode(group.main=true) to put parent and child close to each other(parent first), then we can use DocTransformer to update parent document when access its child document.

Some thought about Implementation:
org.apache.solr.response.TextResponseWriter.writeDocuments(String, ResultContext, ReturnFields)
when cachMode=true, in the for loop, after transform, we can store the solrdoc in a list, write these doc at the end.

cachMode = req.getParams().getBool("cachMode", false);
SolrDocument[] cachedDocs = new SolrDocument[sz];
for (int i = 0; i < sz; i++) {
SolrDocument sdoc = toSolrDocument(doc);
if (transformer != null)

{ transformer.transform(sdoc, id); }

if(cachMode)

{ cachedDocs[i] = sdoc; }

else

{ writeSolrDocument( null, sdoc, returnFields, i ); }

}
if (transformer != null) {
transformer.setContext(null);
}
if(cachMode) {
for (int i = 0; i < sz; i++)

{ writeSolrDocument(null, cachedDocs[i], returnFields, i); }

}
writeEndDocumentList();