Merge branch 'feature/widgets' into feature/dependent

assets/javascripts/reporting/filters.js

@@ -142,6 +142,10 @@ Reporting.Filters = {
     Reporting.Filters.visible_filters().each(function (filter) {
       Reporting.Filters.remove_filter(filter);
     });
+  },
+
+  narrow_values: function (dependent_name) {
+    console.log("Narrowing values not implemented");
   }
 };
 
@@ -172,4 +176,12 @@ Reporting.onload(function () {
     }).size();
     s.multiple = (selected_size > 1);
   });
+  $$('.filters-select[data-dependent]').each(function (dependency) {
+    dependency.observe("change", function () {
+      var dependent_name = this.getAttribute("data-dependent");
+      $("add_filter_select").select("option[value='" + dependent_name + "']").first().selected = true;
+      Reporting.Filters.add_filter($("add_filter_select"));
+      Reporting.Filters.narrow_values(dependent_name);
+    });
+  });
 });

lib/report/controller.rb

@@ -100,6 +100,22 @@ module Report::Controller
     end
   end
 
+  ##
+  # Determine the available values for the specified filter and return them as
+  # json
+  def values
+    dependency = params[:dependency].to_sym
+    dependent = params[:dependent]
+
+    query = CostQuery.new
+    query.filter(dependency,
+      :operator => params[:operators][dependency],
+      :values => params[:values][dependency])
+    query.column(dependent)
+    values = query.result.collect {|r| r.fields[dependent] }
+    render :text => values.to_json
+  end
+
   ##
   # Determine the requested engine by constantizing from the :engine parameter
   # Sets @report_engine and @title based on that, and makes the engine available