I'm trying to understand how to approach search requirements I have.
The first one is a normal product search that I know Solr can handle appropriately, where you search for a term and Solr returns relevant documents.
The second one is a search for products within a certain category. I have a hierarchical structure in my database that consists in a category with many subcategories and those have products.
The thing is, when some very specific words are searched for, the first approach shouldn't be used, instead a search for a category should be done and only products within that category should be returned, which for me is a very basic SQL query (select * from products where categoryId = 1000).
Does Solr should or can be used in the second case? If so, what is the normal approach to use?
Besides what #Mysterion proposed of filter queries you should take a look at Solr Facets which gives you very powerful catogory-like searching.
You also might want to consider multivalue field for categoryParentIds which will contain the parent categories that the product is in and thus combined with filter query and or facets will get your parent category searching.
Yes, you could use similar approach in Solr, by attributing your products with categoryId and later, while searching add filter query similiar to SQL, categoryId:10000
For more info about filter query, take a look here - http://wiki.apache.org/solr/CommonQueryParameters#fq
Related
We have a situation where we are keeping two indexes with different schemas.
For example: suppose we have an index for seller where the key value is seller id and other attributes are seller information. Now another index is book where book id is unique key and it keeps book related information.
Is it possible to query both these indexes in a single query and get collective results?
I have checked Solr but as per my findings we can do this through distributed search in Solr but it works on same kind of schema being distributed in at max 3 indexes.
I am a newbie to Solr so please ignore if this is a stupid question.
You need to think about what makes sense for a search query but there are some rules.
The first requirement is that the unique keys need to have the same name and be unique across collections or Solr cannot collate results.
If you are then hoping to get some kind of sensible ranking of your results you need some common fields. For example I have two collections: one of product data and one containing product related documents. I have a unique key: id and I have common title and contents fields for when I want to query across the two collections. I also have an advanced search interface where I can query on specific fields like product id.
A "unification core" is a typical way of handling search across two or more cores, see this Stack Overflow answer on how to set that up
Query multiple collections with different fields in solr
Other techniques are to use federated search with something like Carrot or to issue two queries and show the results in different tabs in the search results.
I'm new to Solr's faceting. The facet section in the search response sees only contain facet terms and counts, no documents associated. Now, if I would like to find a document which belongs to a facet, do I need to pass the facet in the search query and do the search over again? what is the best way to use facets? Thanks
Yes, you have to issue a new search, typically by adding a filter query, in the form of myfacetfield:"facetterm" to your original request.
If you want the documents belonging to each aggregation bucket delivered up front, you can use grouping instead.
I would like to perform a Solr search using the values of certain fields of an indexed document which I can identify by its id. With MLT this is somehow possible, but I would prefer a regular query parser. Can I somehow use subqueries to inject the result of a subquery into the main query?
For example, let's say I have indexed information about books into solr, where each document represents a book, with an id, title and author field. At query time I have only the document id availible and I would like to search for books by the same author in a single step. Is this possible without using MLT?
You can use JOIN.
http://HOST:PORT/CORE/select?q={!join from=author to=author}id:<ID>
I have documents with multiple facets. I have different views on the website I'm creating to view the facet stats.
As well as showing the facet stats, I would like to show example documents from each facet - specifically, the first and last documents ordered by another field.
For example, properties for sale, I want to see the first and last (based on price) for each facet (the facet can be street, area, city, post code etc).
I can solve this by calling SOLR multiple times for each facet, but it seems like something that should be built in and if so, it would reduce roundtrips a LOT. (it would mean probably 2 SOLR calls per page instead of 30 or possibly more)
Instead of faceting, you can look into
https://wiki.apache.org/solr/FieldCollapsing
Then you need to do only two queries with group.sort ASC or DESC on the field by which you want to sort.
I'm working on improving search which is powered by solr for my e-commerce project. So search queries are performed into Solr and results are returned by Solr.
This is working fine. Now I need to offer a facet on the search results. The first could be category this is easy to implement as Category is common to all product and in the query I make I just enable facet and pass category as facet field.
However, for different nature of products there could be different products and they have few facets defined for them.
I'm clueless as how would I know them in advance and pass it in solr search query? Does solr return all facet field by some queries along with the search results? If yes, how?
If no, then what could be the correct way to proceed further.
Pass all Unique Facet Field Name on which you want to make facet filtering, and you will get all records that have facet field.
Define all the static fieldnames in your facet query search, if there are no hits you will not get any results back for that field.
Pass all the possible fields(on which u need faceting) in Facet Field with facet.mincount=1.. so, you'll get only those fields which has at-least one occurrence in your solr data
http://<hostname>:<portname>/solr/<core_name>/select?q:<fieldname>:<value>&fq=<field_name>:<value>&fl=<field1>,<field2>,<fieldn>&start=0&rows=10&facet=true&facet.field=<field1>&facet.field=<field2>&facet.field=<fieldn>&facet.mincount=1