Class: CsvPatch::Revision

Inherits:
Operation show all
Defined in:
lib/csv_patch/revision.rb

Instance Method Summary collapse

Methods inherited from Operation

#csv_line, #csv_values

Constructor Details

#initialize(changes, output_stream, id_column = nil) ⇒ Revision

Returns a new instance of Revision.



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# File 'lib/csv_patch/revision.rb', line 7

def initialize changes, output_stream, id_column = nil
  @output_stream  = output_stream
  @changes        = changes
  @id_column      = id_column

  header_line([])
end

Instance Method Details

#add_new_lines ⇒ Object 



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# File 'lib/csv_patch/revision.rb', line 28

def add_new_lines
  @changes
    .values
    .reject { |change| change.nil? }
    .reject { |change| change[:applied] }
    .each do |addition|
      emit generate_new_row(addition)
    end
end

#column_metadata ⇒ Object 



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# File 'lib/csv_patch/revision.rb', line 38

def column_metadata
  { columns: @columns, empty_columns: @empty_columns }
end

#header_line(line) ⇒ Object 



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# File 'lib/csv_patch/revision.rb', line 15

def header_line line
  return unless line

  @columns          = line
  @id_column_index  = @columns.find_index(@id_column)

  mark_all_columns_empty
end

#replace_line(line) ⇒ Object 



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# File 'lib/csv_patch/revision.rb', line 24

def replace_line line
  emit replacement_line_for(line)
end