Class: Rseed::CsvAdapter

Inherits:
Adapter show all
Defined in:
lib/rseed/csv_adapter.rb

Instance Attribute Summary collapse

Attributes inherited from Adapter

#converter, #error, #logger, #options

Instance Method Summary collapse

Methods inherited from Adapter

#converter_attributes, #mandatory_attributes

Instance Attribute Details

#file ⇒ Object

Returns the value of attribute file.



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# File 'lib/rseed/csv_adapter.rb', line 5

def file
  @file
end

Instance Method Details

#all_headers_found(headers) ⇒ Object 



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# File 'lib/rseed/csv_adapter.rb', line 78

def all_headers_found(headers)
  @missing_headers_mandatory = []
  @missing_headers_optional = []
  found_at_least_one = false

  converter_attributes.each do |attribute|
    if headers[attribute.name].nil?
      unless attribute.options[:optional]
        @missing_headers_mandatory << attribute.name
      else
        @missing_headers_optional << attribute.name
      end
    else
      found_at_least_one = true
    end
  end
  if found_at_least_one
    logger.warn "Missing optional headers: #{@missing_headers_optional.join(',')}".yellow unless @missing_headers_optional.empty?
    logger.warn "Missing mandatory headers: #{@missing_headers_mandatory.join(',')}".red unless @missing_headers_mandatory.empty?
  end
  return false unless @missing_headers_mandatory.empty?
  true
end

#match_headers(input) ⇒ Object 



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# File 'lib/rseed/csv_adapter.rb', line 16

def match_headers input
  headers = {}

  input.each_with_index do |column_value, index|
    column_value.strip! if column_value
    column = index + 1
    converter_attributes.each do |attribute|
      if attribute.matches? column_value
        logger.debug "Found header for #{attribute.name} at column #{column}".green
        if (headers[attribute.name].nil?)
          headers[attribute.name] = column
        else
          logger.error "Found duplicate header '#{attribute.name}' on columns #{column} and #{headers[attribute.name]}.".red
        end
      end
    end
  end

  return headers
end

#preprocess ⇒ Object 



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# File 'lib/rseed/csv_adapter.rb', line 7

def preprocess
  return false unless file
  logger.info "Preprocessing CSV file: #{file.to_s.yellow}"
  @estimated_rows = CSV.read(file).length
  @estimated_rows -=1 unless options[:headers]
  logger.info "Estimated Rows: #{@estimated_rows}".magenta
  true
end

#process(&block) ⇒ Object 



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# File 'lib/rseed/csv_adapter.rb', line 37

def process &block
  self.options = self.options.to_hash.symbolize_keys

  headers = {}
  header = true

  if options[:headers]
    headers = match_headers(options[:headers].split(','))
    header = false
    unless all_headers_found(headers)
      logger.error "The supplied headers did not match all attributes".red
      return
    end
  end

  data_count = 0
  row_number = 0

  # Get an estimate of the number of rows in the file
  csv_options = {:encoding => 'windows-1251:utf-8'}.merge(self.options)
  CSV.foreach(file, csv_options) do |row|
    row_number += 1
    if (header)
      headers = match_headers(row)
      unless all_headers_found(headers)
        logger.error "Missing headers".red
        break
      end
      header = false
    else
      import_row = {}
      headers.each_pair do |name, column|
        value = row[column - 1].to_s
        import_row[name] = value
      end
      data_count += 1
      yield import_row, record_count: data_count, total_records: @estimated_rows
    end
  end
end