doc-lumber-smart-chart-repartition

1 format

// The value MUST be formatted like this.
{
  value: [{
    key: <string> ,
    value: <number>
  }, {
    key: <string> ,
    value: <number>
  }, …]
}

2 config-routes.rb

# /config/routes.rb
Rails.application.routes.draw do
  # MUST be declared before the mount ForestLiana::Engine.
  namespace :forest do
    post '/stats/credit-card-country-repartition' => 'charts#credit_card_country_repartition'
  end
  
  mount ForestLiana::Engine => '/forest'
end

3 app-controllers-forest-charts_controller.rb

# /app/controllers/forest/charts_controller.rb
class Forest::ChartsController < ForestLiana::ApplicationController
  def credit_card_country_repartition
    repartition = []

    from = Date.parse('2018-03-01').to_time(:utc).to_i
    to = Date.parse('2018-03-20').to_time(:utc).to_i

    Stripe::Charge.list({ 
      created: { gte: from, lte: to }, 
      limit: 100 
    }).each do |charge|
      country = charge.source.country || 'Others'

      entry = repartition.find { |e| e[:key] == country }
      if !entry
        repartition << { key: country, value: 1 }
      else
        ++entry[:value]
      end
    end

    stat = ForestLiana::Model::Stat.new({ value: repartition })
    render json: serialize_model(stat)
  end
end