add distributions of debt sources and transaction amounts

app/controllers/concerns/statistics.rb

@@ -17,6 +17,18 @@ class Statistics < Rails::Application
     end
   end
 
+  def by_issuer
+    Transaction.group(:issuer_id).count.inject(Hash.new) do |hash, (id, count)|
+      hash.merge({User.find(id).name => count})
+    end
+  end
+
+  def amount_distribution
+    Transaction.group("round(amount / 10)").count.inject(Hash.new) do |hash, (group, count)|
+      hash.merge({10 * group.to_i => count})
+    end
+  end
+
   private
 
   def zeus_balance

app/views/pages/landing.html.haml

@@ -6,10 +6,10 @@
   Log een keer in!
   %p= link_to "Log in met Zeus WPI", user_omniauth_authorize_path(:zeuswpi)
 %h2 Cute Little Statistics
-%p None here yet.
-%h2 Wall of Shame
+= javascript_include_tag "//www.google.com/jsapi", "chartkick"
 .pure-g
   .pure-u-1-2
+    %h3 Table of Shame
     %table.pure-table
       %thead
         %th Shame on
@@ -22,5 +22,12 @@
             // a shameful debt if the total debt is zero.
             %td.shame-percentage= "#{100 * user.balance / @statistics.total_debt}%"
   .pure-u-1-2
-    = javascript_include_tag "//www.google.com/jsapi", "chartkick"
+    %h3 Pie of Shame
     = pie_chart @statistics.shamehash
+.pure-g
+  .pure-u-1-2
+    %h3 Distribution of Debt Sources
+    = pie_chart @statistics.by_issuer
+  .pure-u-1-2
+    %h3 Distribution of Transaction Amounts
+    = column_chart @statistics.amount_distribution