Implement basic diagram

app/assets/javascripts/rfc_activity_history.js

@@ -0,0 +1,77 @@
+$(document).ready(function () {
+  var containerId = 'rfc-activity-history';
+
+  if ($.isController('statistics') && $('.graph#' + containerId).isPresent()) {
+
+    var chartData;
+    var dataset;
+    var graph;
+    var groups;
+
+    var params = new URLSearchParams(window.location.search.slice(1));
+
+    var buildChartGroups = function() {
+      return _.map(chartData, function(element) {
+        return {
+          content: element.name,
+          id: element.key,
+          visible: true,
+          options: {
+            interpolation: false
+          }
+        };
+      });
+    };
+
+    var initializeChart = function() {
+      dataset = new vis.DataSet();
+      groups = new vis.DataSet(buildChartGroups());
+      graph = new vis.Graph2d(document.getElementById(containerId), dataset, groups, {
+        dataAxis: {
+          customRange: {
+            left: {
+              min: 0
+            }
+          },
+          showMinorLabels: true
+        },
+        drawPoints: {
+          style: 'circle'
+        },
+        legend: true,
+        start: params.get('from'),
+        end: params.get('to')
+      });
+    };
+
+    var refreshData = function(callback) {
+      var jqxhr = $.ajax('rfc-activity-history.json', {
+        dataType: 'json',
+        data: {from: params.get('from'), to: params.get('to'), interval: params.get('interval')},
+        method: 'GET'
+      });
+      jqxhr.done(function(response) {
+        (callback || _.noop)(response);
+        updateChartData(response);
+      });
+    };
+
+    var updateChartData = function(response) {
+      _.each(response, function(group) {
+        _.each(group.data, function(data) {
+          dataset.add({
+            group: group.key,
+            x: data.key,
+            y: data.value
+          });
+        });
+      });
+    };
+
+    refreshData(function (data) {
+      chartData = data;
+      $('#' + containerId).parent().find('.spinner').hide();
+      initializeChart();
+    });
+  }
+});

app/controllers/statistics_controller.rb

@@ -37,10 +37,10 @@ class StatisticsController < ApplicationController
     respond_to do |format|
       format.html { render 'rfc_activity_history' }
       format.json do
-        range = params[:range] || 'year'
+        interval = params[:interval] || 'year'
         from = DateTime.strptime(params[:from], '%Y') rescue DateTime.new(0)
         to = DateTime.strptime(params[:to], '%Y') rescue DateTime.now
-        render(json: ranged_rfc_data(range, from, to))
+        render(json: ranged_rfc_data(interval, from, to))
       end
     end
   end

app/helpers/statistics_helper.rb

@@ -152,37 +152,37 @@ module StatisticsHelper
     ]
   end
 
-  def ranged_rfc_data(range='year', from=DateTime.new(0), to=DateTime.now)
+  def ranged_rfc_data(interval='year', from=DateTime.new(0), to=DateTime.now)
     [
         {
             key: 'rfcs',
             name: t('activerecord.models.request_for_comment.other'),
             data: RequestForComment.in_range(from, to)
-                      .select("date_trunc('#{range}', created_at) AS \"range\", count(id)")
-                      .group('range').order('range')
+                      .select("date_trunc('#{interval}', created_at) AS \"key\", count(id) AS \"value\"")
+                      .group('key').order('key')
         },
         {
             key: 'rfcs_solved',
             name: t('statistics.entries.request_for_comments.percent_solved'),
             data: RequestForComment.in_range(from, to)
                       .where(solved: true)
-                      .select("date_trunc('#{range}', created_at) AS \"range\", count(id)")
-                      .group('range').order('range')
+                      .select("date_trunc('#{interval}', created_at) AS \"key\", count(id) AS \"value\"")
+                      .group('key').order('key')
         },
         {
             key: 'rfcs_soft_solved',
             name: t('statistics.entries.request_for_comments.percent_soft_solved'),
             data: RequestForComment.in_range(from, to).unsolved
                       .where(full_score_reached: true)
-                      .select("date_trunc('#{range}', created_at) AS \"range\", count(id)")
-                      .group('range').order('range')
+                      .select("date_trunc('#{interval}', created_at) AS \"key\", count(id) AS \"value\"")
+                      .group('key').order('key')
         },
         {
             key: 'rfcs_unsolved',
             name: t('statistics.entries.request_for_comments.percent_unsolved'),
             data: RequestForComment.in_range(from, to).unsolved
-                      .select("date_trunc('#{range}', created_at) AS \"range\", count(id)")
-                      .group('range').order('range')
+                      .select("date_trunc('#{interval}', created_at) AS \"key\", count(id) AS \"value\"")
+                      .group('key').order('key')
         }
     ]
   end

app/views/statistics/rfc_activity_history.html.slim

@@ -6,7 +6,7 @@
   .title
     h1 = t('statistics.graphs.rfc_activity')
   .spinner
-  .graph#rfc-activity
+  .graph#rfc-activity-history
   form
     .form-group
       label for="from-date" = t('.from')
@@ -15,8 +15,8 @@
       label for="to-date" = t('.to')
       input type="date" class="form-control" id="to-date" name="to" value=DateTime.now.to_date
     .form-group
-      label for="range" = t('.interval')
-      select class="form-control" id="range" name="range"
+      label for="interval" = t('.interval')
+      select class="form-control" id="interval" name="interval"
         = [:decade, :year, :month, :day, :hour, :minute, :second].each do | key |
           option selected=(key==:year) = key
     button type="submit" class="btn btn-primary" = t('.update')