Class: PennMARC::Genre

Inherits:
Helper
  • Object
show all
Defined in:
lib/pennmarc/helpers/genre.rb

Overview

Genre field values come from the 655, but for some contexts we are only interested in a subset of the declared terms in a record.

Constant Summary

Constants included from Util

Util::TRAILING_PUNCTUATIONS_PATTERNS

Class Method Summary collapse

Methods included from Util

#append_relator, #append_trailing, #datafield_and_linked_alternate, #field_defined?, #field_or_its_linked_alternate?, #join_and_squish, #join_subfields, #linked_alternate, #linked_alternate_not_6_or_8, #no_subfield_value_matches?, #prefixed_subject_and_alternate, #relator, #relator_join_separator, #relator_term_subfield, #remove_paren_value_from_subfield_i, #subfield_defined?, #subfield_in?, #subfield_not_in?, #subfield_undefined?, #subfield_value?, #subfield_value_in?, #subfield_value_not_in?, #subfield_values, #subfield_values_for, #substring_after, #substring_before, #translate_relator, #trim_punctuation, #trim_trailing, #trim_trailing!, #valid_subject_genre_source_code?

Class Method Details

.facet(record) ⇒ Array<String>

TODO:

the Genre facet in Franklin is pretty ugly. It could be cleaned up by limiting the subfields included here and cleaning up punctuation.

Genre values for faceting. We only set Genre facet values for movies (videos) and manuscripts(?), and ensure that the headings come from our set of approved ontologies.



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# File 'lib/pennmarc/helpers/genre.rb', line 52

def facet(record)
  format_code = record.leader[6] || ' '
  manuscript = Format.include_manuscripts?(format_code)
  video = record.fields('007').any? { |field| field.value.starts_with? 'v' }
  return [] unless manuscript || video

  record.fields('655').filter_map { |field|
    next unless allowed_genre_field?(field)

    join_subfields field, &subfield_not_in?(%w[0 2 5 c])
  }.uniq
end

.search(record) ⇒ Array<String>

Genre values for searching. We’re less picky about what is included here to enable discovery via any included 655 data.



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# File 'lib/pennmarc/helpers/genre.rb', line 13

def search(record)
  record.fields('655').map { |field|
    join_subfields(field, &subfield_not_in?(%w[0 2 5 c]))
  }.uniq
end

.show(record) ⇒ Array<String>

TODO:

subfields e and w do not appear in the documentation for 655, but we give them special consideration here, what gives?

Note:

legacy method returns a link object

Genre values for display. We display Genre/Term values if they fulfill the following criteria:

- The field is in {https://www.oclc.org/bibformats/en/6xx/655.html MARC 655}. Or the field is in MARC 880 with
  subfield 6 including '655'.
 AND
  - Above fields have an indicator 2 value of: 0 (LSCH) or 4 (No source specified).
   OR
  - Above fields have a subfield 2 (ontology code) in the list of allowed values.



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# File 'lib/pennmarc/helpers/genre.rb', line 31

def show(record)
  record.fields(%w[655 880]).filter_map { |field|
    next unless allowed_genre_field?(field)

    next if field.tag == '880' && no_subfield_value_matches?(field, '6', /^655/)

    subfields = %w[a b]
    sub_with_hyphens = field.find_all(&subfield_not_in?(%w[0 2 5 6 8 c e w])).map { |sf|
      sep = subfields.exclude?(sf.code) ? ' -- ' : ' '
      sep + sf.value
    }.join.lstrip
    "#{sub_with_hyphens} #{field.find_all(&subfield_in?(%w[e w])).join(' -- ')}".strip
  }.uniq
end