Class: Cassandra

Inherits:
Object show all
Defined in:
lib/right_support/db/cassandra_model.rb

Defined Under Namespace

Modules: Protocol

Instance Method Summary collapse

Instance Method Details

#get_indexed_slices(column_family, index_clause, *columns_and_options) ⇒ Object

Monkey patch get_indexed_slices so that it returns OrderedHash, otherwise cannot determine next start key when getting in chunks



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# File 'lib/right_support/db/cassandra_model.rb', line 83

def get_indexed_slices(column_family, index_clause, *columns_and_options)
  return false if Cassandra.VERSION.to_f < 0.7

  column_family, columns, _, options =
    extract_and_validate_params(column_family, [], columns_and_options, READ_DEFAULTS.merge(:key_count => 100, :key_start => ""))

  if index_clause.class != CassandraThrift::IndexClause
    index_expressions = index_clause.collect do |expression|
      create_index_expression(expression[:column_name], expression[:value], expression[:comparison])
    end

    index_clause = create_index_clause(index_expressions, options[:key_start], options[:key_count])
  end

  key_slices = _get_indexed_slices(column_family, index_clause, columns, options[:count], options[:start],
                                   options[:finish], options[:reversed], options[:consistency])

  key_slices.inject(OrderedHash.new) { |h, key_slice| h[key_slice.key] = key_slice.columns; h }
end

#get_range_single(column_family, options = {}) ⇒ Object

Monkey patch get_range_single so that it can return a array of key slices rather than converting it to a Hash



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# File 'lib/right_support/db/cassandra_model.rb', line 49

def get_range_single(column_family, options = {})
  return_empty_rows = options.delete(:return_empty_rows) || false
  slices_please     = options.delete(:slices_not_hash) || false

  column_family, _, _, options =
    extract_and_validate_params(column_family, "", [options],
                                READ_DEFAULTS.merge(:start_key  => '',
                                                    :finish_key => '',
                                                    :key_count  => 100,
                                                    :columns    => nil,
                                                    :reversed   => false
                                )
    )

  results = _get_range(column_family,
                       options[:start_key].to_s,
                       options[:finish_key].to_s,
                       options[:key_count],
                       options[:columns],
                       options[:start].to_s,
                       options[:finish].to_s,
                       options[:count],
                       options[:consistency],
                       options[:reversed])

  unless slices_please
    multi_key_slices_to_hash(column_family, results, return_empty_rows)
  else
    results
  end
end