Solr - Block join Parent query with many Children

问题:

The question is applied for the following nested documents:

<doc>
  <field name="id">1</field>
  <field name="title">Solr has block join support</field>
  <field name="content_type">parentDocument</field>
  <doc>
    <field name="id">11</field>  
    <field name="type">comment</field>  
    <field name="comments">SolrCloud supports it too!</field>
  </doc>
  <doc>
    <field name="id">12</field>  
    <field name="type">publisher</field>  
    <field name="address">England</field>
    ....
  </doc>
</doc>
....

My question is, how to write the Block Join Parent Query which allows to have constraints on multiple nested children documents? I did try the following, but it did not work:

{!parent which="content_type:accommodation"}
(
  (+type:comment +comments:SolrCloud) AND
  (+type:publisher +address:England)
) 

0 was returned as result!

回答1:

For your use case you can just multiple block join filters:

q=*:*&
fq={!parent which="content_type:accommodation"}(+type:comment +comments:SolrCloud)&
fq={!parent which="content_type:accommodation"}(+type:publisher +address:England)

the first filter clouse will find which parent documents have a child which satisfies condition (+type:comment +comments:SolrCloud).

The second filter clouse will operate over subset of parent documents that satisfy the first filter. And it will find in this subset the parent documents that satisfy condition (+type:publisher +address:England).