如何在Solr索引中创建嵌套文档？

Question

I want to create nested document in solr, I am using java/GWT/SolrJ.

Currently I am indexing following fields:

Items:
id title desc.

1 xyz xyzxyzxyz

2 pqr pqrpqrpqr

3 abc abcabcabc.

But now i want to create one more document linked with each document from above ie for id 1 there is one subdocument which contains follwing fields:

Item_User_Details:

for item 1 :

user details

1 qweqweqwe

2 xyzxyzxyz

3 asdasdasd

in this way I want to create for each item id from above table, there is one linked document of item_user_details.

How can I do this...? Thanks in advance...

Answer 1

In our schema we've a lot of related tables.

We decided to flatten all relations into one document. To achieve this we created a custom importer (using SolrJ), which loads each document from the index, adds the related fields and write that document back.

[edit]
We do this in the following way:

1. export the data in a csv-file for each table (item, item_user_details)
2. import each csv-file into Solr, starting with the top (item in your case)
3. Start an Embedded-Solr server:
   System.setProperty("solr.solr.home", config.getSolrIndexPath()); CoreContainer.Initializer initializer = new CoreContainer.Initializer(); this.coreContainer = initializer.initialize(); this.solr = new EmbeddedSolrServer(this.coreContainer, "");
   Alternatively you can access a remote solr instance:
   this.solr = new HttpSolrServer("http://[your-url]/solr");
4. Create a SolrDocument for each line in the file
5. add it to the index this.solr.add(ClientUtils.toSolrInputDocument(doc));
6. Commit this.solr.commit();
7. Load documents from the index (items)
8. Idetify relations in the csv-file for item_user_details via the document id (item-id)
9. Exted the loaded document with the fields from item_user_details
10. Commit the Document again