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Contents
module Europeana
module Blacklight
class Document
##
# Methods for obtaining "more like this" documents
module MoreLikeThis
# @param [String] param Name of API parameter to restrict query to
# @return [String]
def more_like_this_query(param = nil)
queries = more_like_this_field_queries(param)
return nil unless queries.size > 0
field_queries = queries.join(' OR ')
"(#{field_queries}) NOT europeana_id:\"#{self.id}\""
end
protected
def more_like_this_logic
[
{ param: 'what', fields: ['proxies.dcType', 'proxies.dcSubject'], boost: 0.8 },
{ param: 'who', fields: 'proxies.dcCreator', boost: 0.5 },
{ param: 'title', fields: 'title', boost: 0.3 },
{ param: 'DATA_PROVIDER', fields: 'aggregations.edmDataProvider', boost: 0.2 }
]
end
def more_like_this_field_terms(*fields)
fields.flatten.map do |field|
fetch(field, []).compact[0..9]
end.flatten
end
def more_like_this_field_queries(param = nil)
logic = more_like_this_logic.select do |component|
param.nil? || component[:param] == param
end
logic.map do |component|
field_terms = more_like_this_field_terms(component[:fields])
more_like_this_param_query(component[:param], field_terms, component[:boost])
end.compact
end
def more_like_this_param_query(param, terms, boost)
return nil unless terms.present?
string_terms = terms.select { |t| t.is_a?(String) }
return nil unless string_terms.present?
or_terms = string_terms.map do |v|
'"' + Europeana::API.record.escape(v) + '"'
end.join(' OR ')
"#{param}: (#{or_terms})^#{boost}"
end
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems