Class: ExportHelper::ContextConverter

Inherits:
Object
  • Object
show all
Defined in:
frontend/app/helpers/export_helper.rb

Overview

Creates a “context” string intended to match what is displayed in the Staff UI for search results.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ContextConverter

Returns a new instance of ContextConverter.



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# File 'frontend/app/helpers/export_helper.rb', line 49

def initialize
  # Fetching JSONModel records from the backend creates a lot of overhead, and it's likely that many records have
  # the same ancestor(s), so we'll cache the titles to mitigate that.
  @title_cache = {}
end

Class Method Details

.ancestor_fields ⇒ Object

There are several different fields that ‘context’ data may potentially be drawn from



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# File 'frontend/app/helpers/export_helper.rb', line 45

def self.ancestor_fields
  ['ancestors', 'linked_instance_uris', 'linked_record_uris', 'collection_uri_u_sstr', 'digital_object']
end

Instance Method Details

#convert_ancestors_to_context(old_csv) ⇒ Object 



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# File 'frontend/app/helpers/export_helper.rb', line 55

def convert_ancestors_to_context(old_csv)
  # we want all the columns from the search except for the various ancestor fields, which will all end up in context
  new_csv = [old_csv[0].reject {|header| self.class.ancestor_fields.include? header}]
  new_csv[0].append 'context'
  new_row_length = new_csv[0].length
  context_column_index = new_csv[0].index 'context'

  column_map = []
  old_csv[0].each_with_index do |old_column, old_column_index|
    new_column_index = new_csv[0].index(old_column)
    if new_column_index
      column_map[old_column_index] = new_column_index
    else
      column_map[old_column_index] = context_column_index
    end
  end

  old_csv[1...old_csv.length].each do |old_row|
    new_row = Array.new(new_row_length)
    column_map.each_with_index do |new_column_index, old_column_index|
      if new_column_index == context_column_index
        # these ones need to be moved to the context column if they exist
        uris = old_row[old_column_index]
        new_row[new_column_index] = context_string(uris.split ',') unless uris.blank?
      else
        new_row[new_column_index] = old_row[old_column_index]
      end
    end
    new_csv.append new_row
  end

  new_csv
end