Class: Kiba::Extend::Transforms::Explode::FieldValuesToNewRows

Inherits:
Object
  • Object
show all
Defined in:
lib/kiba/extend/transforms/explode.rb

Instance Method Summary collapse

Constructor Details

#initialize(target:, fields: [], multival: false, sep: " ", keep_nil: false, keep_empty: false) ⇒ FieldValuesToNewRows

Returns a new instance of FieldValuesToNewRows.



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# File 'lib/kiba/extend/transforms/explode.rb', line 105

def initialize(target:, fields: [], multival: false, sep: " ",
  keep_nil: false, keep_empty: false)
  @fields = [fields].flatten
  @target = target
  @multival = multival
  @sep = sep
  @keep_nil = keep_nil
  @keep_empty = keep_empty
end

Instance Method Details

#process(row, &block) ⇒ Object 



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# File 'lib/kiba/extend/transforms/explode.rb', line 115

def process(row, &block)
  rows = []
  other_fields = row.keys - @fields
  other_data = {}
  other_fields.each { |f| other_data[f] = row.fetch(f, nil) }

  @fields.each do |field|
    val = row.fetch(field, nil)
    vals = if val.nil?
      [nil]
    elsif val.empty?
      [""]
    elsif @multival
      val.split(@sep, -1)
    else
      [val]
    end

    vals.each do |val|
      next if !@keep_nil && val.nil?
      next if !(val.nil? || @keep_empty) && val.empty?

      new_row = other_data.clone
      new_row[@target] = val
      rows << new_row
    end
  end
  rows.each(&block)
  nil
end