export list of datagroups in format of XML. #330

app/controllers/datagroups_controller.rb

@@ -15,10 +15,14 @@ class DatagroupsController < ApplicationController
   end
 
   def index
-    validate_sort_params(collection: ['id', 'title', 'datacolumns_count'], default: 'title')
-    @datagroups = Datagroup.select('id, title, description, created_at, datacolumns_count')
-                  .search(params[:search])
-                  .paginate(page: params[:page], per_page: 100, order: "#{params[:sort]} #{params[:direction]}")
+    validate_sort_params(collection: ['id', 'title', 'datacolumns_count', 'categories_count'], default: 'title')
+    dgs = Datagroup.select('id, title, description, created_at, datacolumns_count,
+                            (select count(*) from categories where datagroup_id = datagroups.id) as categories_count')
+                   .order("#{params[:sort]} #{params[:direction]}").search(params[:search])
+    respond_to do |format|
+      format.html { @datagroups = dgs.paginate(page: params[:page], per_page: 100) }
+      format.xml { @datagroups = dgs}
+    end
   end
 
   def show

app/helpers/datagroups_helper.rb

@@ -11,7 +11,9 @@ def dropdown_list_to_sort_datagroups
       "Title" => datagroups_path(params.merge(sort: 'title', direction: 'asc')),
       "Recently Added" => datagroups_path(params.merge(sort: 'id', direction: 'desc')),
       "Most used" => datagroups_path(params.merge(sort: 'datacolumns_count', direction: 'desc')),
-      "Least Used" => datagroups_path(params.merge(sort: 'datacolumns_count', direction: 'asc'))
-      }, selected: datagroups_path(params))
+      "Least Used" => datagroups_path(params.merge(sort: 'datacolumns_count', direction: 'asc')),
+      "Most categories" => datagroups_path(params.merge(sort: 'categories_count', direction: 'desc')),
+      "Least categories" => datagroups_path(params.merge(sort: 'categories_count', direction: 'asc'))
+    }, selected: datagroups_path(params))
   end
 end

app/views/datagroups/index.html.haml

@@ -42,8 +42,9 @@
             .description
               = highlight dg.description, params[:search]
           .comment
+            = pluralize(dg.categories_count, 'category')
+            |
             = pluralize(dg.datacolumns_count, 'datacolumn')
-            in this datagroup
             .right
               Added at #{dg.created_at}
         - if authorized_to_edit_and_delete

app/views/datagroups/index.xml.builder

@@ -0,0 +1,12 @@
+xml.instruct!
+xml.datagroups {
+  @datagroups.each do |dg|
+    xml.datagroup(id: dg.id) {
+      xml.id dg.id
+      xml.title dg.title
+      xml.description dg.description
+      xml.columns_count dg.datacolumns_count
+      xml.categories_count dg.categories_count
+    }
+  end
+}