Dynamic fields

OVERVIEW
from the documentation: http://outoftime.github.com/sunspot/docs/classes/Sunspot.html#M000001

“a category named ‘Fruit’ with
values of ‘Banana’, ‘Apple’, ‘Orange’, and ‘Grape’. On the search
results page, ‘Fruit’ should be displayed as a facet category with
counts for matches for ‘Banana’, ‘Apple’, ‘Orange’, and ‘Grape’ on any
text field of the document. "

class MyClass 
  searchable do 
    dynamic_integer :custom_category_ids, :multiple => true do 
      custom_categories.inject(Hash.new { |h, k| h[k] = [] }) do |map, custom_category| 
        map[custom_category.id] << custom_category_values_for(custom_category) 
      end 
    end 
  end 
end 
search = MyClass.search do 
  dynamic(:custom_categories) do 
    facet(some_custom_category.id) 
  end 
end 
facet = search.facet(:custom_categories, some_custom_category.id)

excerpted from this conversation

==

Sunspot modifies field names in a regular way while indexing and searching from ruby hash-parameters.

Were you to query a Sunspot-indexed record using a lower-level library like RSolr, you might see:

rsolr.select(:q=>"*:*")['response']['docs'].first.keys
# => ["updated_at_ds", "highest_score_is", "title_texts", "id"]

NOTES:
- id is magic… solr needs
- do not change primary key field

HOW TO:
- allowing OPTION of non-dynamic indexing by indexing through request_handlers in solrconfig.xml