Class: PennMARC::Database

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

Overview

Parses Database Subject Category and Database Type local fields

Constant Summary collapse

DATABASES_FACET_VALUE =

Database format type used to facet databases, found in local field 944 subfield ‘a’.

'Database & Article Index'
COI_CODE =

Penn Libraries’ Community of Interest code used in local field 943 subfield ‘2’.

'penncoi'

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

.category_facet(record) ⇒ Array<String>

Retrieves database subject category/communities of interest (subfield ‘a’) from local field 943. Only returns database subject category if Penn’s Community of Interest code is present in subfield ‘2’.

Parameters:

  • record (MARC::Record)

Returns:

  • (Array<String>) —

    Array of categories



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# File 'lib/pennmarc/helpers/database.rb', line 37

def category_facet(record)
  return [] unless curated_db?(record)

  record.fields('943').filter_map { |field|
    # skip unless Community of Interest code is in subfield '2'
    next unless subfield_value?(field, '2', /#{COI_CODE}/o)

    category = field.find { |subfield| subfield.code == 'a' }
    category&.value
  }.uniq
end

.subcategory_facet(record) ⇒ Array<String>

Note:

return value differs from legacy implementation. This version only returns [“category–subcategory”] or an empty array.

Concatenates database subject category with database sub subject category in the format “category–subcategory” if both values are present. Retrieves both values respectively from subfield ‘a’ and subfield ‘b’ of local field 943. Only returns subcategory if Penn’s Community of Interest code is present in subfield ‘2’.

Parameters:

  • record (MARC::Record)

Returns:

  • (Array<String>) —

    Array of “category–subcategory”



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# File 'lib/pennmarc/helpers/database.rb', line 58

def subcategory_facet(record)
  return [] unless curated_db?(record)

  record.fields('943').filter_map { |field|
    # skip unless Community of Interest code is in subfield '2'
    next unless subfield_value?(field, '2', /#{COI_CODE}/o)

    category = field.find { |subfield| subfield.code == 'a' }

    # skip if category is blank
    next if category.blank?

    subcategory = field.find { |subfield| subfield.code == 'b' }

    # skip if subcategory is blank
    next if subcategory.blank?

    "#{category.value}--#{subcategory.value}"
  }.uniq
end

.type_facet(record) ⇒ Array<String>

Retrieves database subtype (subfield ‘b’) from local field 944. Only returns database subtype if Penn’s Database facet value is present in subfield ‘a’.

Parameters:

  • record (MARC::Record)

Returns:

  • (Array<String>) —

    Array of types



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# File 'lib/pennmarc/helpers/database.rb', line 21

def type_facet(record)
  record.fields('944').filter_map { |field|
    # skip unless specified database format type present
    next unless subfield_value?(field, 'a', /#{DATABASES_FACET_VALUE}/o)

    type = field.find { |subfield| subfield.code == 'b' }
    type&.value
  }.uniq
end