Random Record as a Solr Search

[Hema Chaudhry]

Hi,

I have few categories under which I have products. Now I need to fetch
one random product of any category on every page refresh. How can get
this type of data back from SolrNet query call through my c#(.net)
program.However I know that SOLR is a search engine and not a rules
engine but any way by which I can get the data as mentioned above.

Please let me know for more details around the same.

Any response will be much appreciated.

Thanks in advance.

Thanks,
Hema Chaudhry

[Mauricio Scheffer]

Perhaps a random sort can help:  http://code.google.com/p/solrnet/wiki/Querying#Sorting 

Cheers,

Mauricio

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[Vince]

Do it in 2 calls, your first returns your first 10 records that the
user matches. Your second will call your random search from solr (i
would add a search stem in the solr config file), introduce a random
field on your index, an call one record from it. Once you have that
records add it to your List<T> or IEnumerable<T>, this if done
properly happens so fast the delay on your request to your user would
be very minimal (milliseconds) and my guess won't be very difficult to
code.

Vince

[Hema Chaudhry]

Thanks for your response, below is my understanding from your response
please validate:

1. Ist Solr call will fetch 10 records
2. I need to take one random record of these 10 record
3. IInd solr call will get the details for the selected random record
from second step.

Now my question is in Step 1 how will 1 choose those random 10 records
to get one out of them?
Will it be feasible to fetch all the records for the first step to get
one random record?

Please correct if I am wrong.

Thanks,
Hema Chaudhry

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>
> - Show quoted text -

[Vince]

Hi,

sorry for delay had some major fires to put out.

once the user performs the search you cold use

List<string> example = solr(..return..); //this is where solrnet
returns the records

Random random = new Random(); //create a random
int randomNumber = random.Next(1, example.count()); // this would
return a random number between 1 and the total records in your return,
from the List<> get the record of that random number

example.Skip(randomNumber).Take(1).First(); //get the random record
from the search

The above would be if you want to get a random record from a search
you have already performed.

the second solution is the add a random field in solr, that is also
really easy.

in your solr schema.xml file add

<dynamicField name="random*" type="random" indexed="true"
stored="false" />

and see http://lucene.apache.org/solr/api/org/apache/solr/schema/RandomSortField.html

or have SolrNet do it for you, Mauricio pasted the link above for it.

[gswartz]

If you add the dynamicField to your schema.xml do you then have to recreate your index or will it work right away?  Thanks.

[Paige Cook]

You will need to recreate your index to have the dynamicField present for all items in the index.The dynamicField will only appear for index items that are added/created after the field was added to the schema (and Solr was restarted).

[gswartz]

Thank you Paige, that worked great!