Module: Mondrian::REST::Formatters

Defined in:
lib/mondrian_rest/api_formatters.rb

Defined Under Namespace

Modules: AggregationJSON, CSV, XLS

Class Method Summary collapse

Class Method Details

.pluck(a, m) ⇒ Object 



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# File 'lib/mondrian_rest/api_formatters.rb', line 123

def self.pluck(a, m)
  a.map { |e| e[m] }
end

.tidy(result, options) ⇒ Object

Generate ‘tidy data’ (vita.had.co.nz/papers/tidy-data.pdf) from a result set.



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# File 'lib/mondrian_rest/api_formatters.rb', line 57

def self.tidy(result, options)
  cube = result.cube

  add_parents = options[:add_parents]
  rs = result.to_h(add_parents, options[:debug])
  measures = rs[:axes].first[:members]
  dimensions = rs[:axis_dimensions][1..-1]
  columns = []
  slices = []
  level_has_all = []

  Enumerator.new do |y|
    dimensions.each do |dd|
      if add_parents
        hier = cube.dimension(dd[:name])
                 .hierarchies
                 .first

        level_has_all << hier.has_all?
        slices << dd[:level_depth]

        hier
          .levels[(hier.has_all? ? 1 : 0)...dd[:level_depth]]
          .each do |ancestor_level|

          columns += ["ID #{ancestor_level.caption}", ancestor_level.caption]
        end
      end

      columns += ["ID #{dd[:level]}", dd[:level]]
    end

    # append measure columns and yield table header
    y.yield columns + pluck(measures, :name)

    prod = rs[:axes][1..-1].map { |e|
      e[:members].map.with_index { |e_, i| [e_,i] }
    }
    values = rs[:values]

    prod.shift.product(*prod).each do |cell|
      cidxs = cell.map { |c,i| i }.reverse

      cm = cell.map(&:first)

      msrs = measures.map.with_index { |m, mi|
        (cidxs + [mi]).reduce(values) { |_, idx| _[idx] }
      }
      if add_parents
        vdim = cm.each.with_index.reduce([]) { |cnames, (member, j)|
          member[:ancestors][0...slices[j] - (level_has_all[j] ? 1 : 0)].each { |ancestor|
            cnames += [ancestor[:key], ancestor[:caption]]
          }
          cnames += [member[:key], member[:caption]]
        }
        y.yield vdim + msrs
      else
        y.yield pluck(cm, :key)
                  .zip(pluck(cm, :caption))
                  .flatten \
                + msrs
      end
    end
  end
end