Class: Marty::DataImporter

Inherits:
Object
  • Object
show all
Defined in:
lib/marty/data_importer.rb

Class Method Summary collapse

Class Method Details

.do_import(klass, data, dt = 'infinity', cleaner_function = nil, validation_function = nil, col_sep = "\t", allow_dups = false, preprocess_function = nil) ⇒ Object

Given a Mcfly klass and CSV data, import data into the database and report on affected rows. Result is an array of tuples. Each tuple is associated with one data row and looks like [tag, id]. Tag is one of :same, :update, :create and “id” is the id of the affected row.



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# File 'lib/marty/data_importer.rb', line 46

def self.do_import(klass,
                   data,
                   dt                  = 'infinity',
                   cleaner_function    = nil,
                   validation_function = nil,
                   col_sep             = "\t",
                   allow_dups          = false,
                   preprocess_function = nil
                   )

  parsed = data.is_a?(Array) ? data :
    CSV.new(data, headers: true, col_sep: col_sep)

  # run preprocessor
  parsed = klass.send(preprocess_function.to_sym, parsed) if
    preprocess_function

  klass.transaction do
    cleaner_ids = cleaner_function ? klass.send(cleaner_function.to_sym) :
      []

    raise "bad cleaner function result" unless
      cleaner_ids.all? {|id| id.is_a?(Integer) }

    eline = 0

    begin
      res = parsed.each_with_index.map do
        |row, line|
        eline = line

        # skip lines which are all nil
        next :blank if row.to_hash.values.none?

        Marty::DataConversion.create_or_update(klass, row, dt)
      end
    rescue => exc
      # to find problems with the importer, comment out the rescue block
      raise Marty::DataImporterError.new(exc.to_s, [eline])
    end

    ids = {}
    # raise an error if record referenced more than once.
    res.each_with_index do
      |(op, id), line|
      raise Marty::DataImporterError.
        new("record referenced more than once", [ids[id], line]) if
        op != :blank && ids.member?(id) && !allow_dups

      ids[id] = line
    end

    begin
      # Validate affected rows if necessary
      klass.send(validation_function.to_sym, ids.keys) if
        validation_function
    rescue => exc
      raise Marty::DataImporterError.new(exc.to_s, [])
    end

    remainder_ids = cleaner_ids - ids.keys

    raise Marty::DataImporterError.
      new("Missing import data. " +
          "Please provide header line and at least one data line.", [1]) if
      ids.keys.compact.count == 0

    klass.delete(remainder_ids)
    res + remainder_ids.map {|id| [:clean, id]}
  end
end

.do_import_summary(klass, data, dt = 'infinity', cleaner_function = nil, validation_function = nil, col_sep = "\t", allow_dups = false, preprocess_function = nil) ⇒ Object

perform cleaning and do_import and summarize its results



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# File 'lib/marty/data_importer.rb', line 16

def self.do_import_summary(klass,
                           data,
                           dt                  = 'infinity',
                           cleaner_function    = nil,
                           validation_function = nil,
                           col_sep             = "\t",
                           allow_dups          = false,
                           preprocess_function = nil
                           )

  recs = self.do_import(klass,
                        data,
                        dt,
                        cleaner_function,
                        validation_function,
                        col_sep,
                        allow_dups,
                        preprocess_function,
                        )

  recs.each_with_object(Hash.new(0)) {|(op, id), h|
    h[op] += 1
  }
end