Module: Blacklight::Document::SemanticFields

Extended by:
ActiveSupport::Concern
Included in:
Blacklight::Document
Defined in:
app/models/concerns/blacklight/document/semantic_fields.rb

Instance Method Summary collapse

Instance Method Details

#to_semantic_values ⇒ Object

Returns a hash keyed by semantic tokens, value is an array of strings. (Array to handle multi-value fields). If no value(s) available, empty array is returned.

Default implementation here uses field_semantics to just take values from Solr stored fields. Extensions can over-ride this method to provide better/different lookup, but extensions should call super and modify hash returned, to avoid unintentionally erasing values provided by other extensions.



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# File 'app/models/concerns/blacklight/document/semantic_fields.rb', line 33

def to_semantic_values
  @semantic_value_hash ||= self.class.field_semantics.each_with_object(Hash.new { |hash, key| hash[key] = [] }) do |(key, field_names), hash|
    ##
    # Handles single string field_name or an array of field_names
    value = Array.wrap(field_names).map { |field_name| self[field_name] }.flatten.compact

    # Make single and multi-values all arrays, so clients
    # don't have to know.
    hash[key] = value unless value.empty?
  end

  @semantic_value_hash ||= {}
end