:nulls_last is optin and cannot be set from request params

Author: n-rodriguez

lib/ajax-datatables-rails/datatable/column/order.rb

@@ -20,7 +20,7 @@ def sort_query
 
         # Add option to sort null values last
         def nulls_last?
-          @view_column[:nulls_last] || @options[:nulls_last] == 'true'
+          @view_column.fetch(:nulls_last, false)
         end
 
       end

spec/ajax-datatables-rails/datatable/column_spec.rb

@@ -10,15 +10,15 @@
     let(:column) { datatable.datatable.columns.first }
 
     before do
-      datatable.params[:columns] = {'0'=>{'data'=>'username', 'name'=>'', 'searchable'=>'true', 'orderable'=>'true', 'search'=>{'value'=>'searchvalue', 'regex'=>'false'}, 'nulls_last'=>'true'}}
+      datatable.params[:columns] = {'0'=>{'data'=>'username', 'name'=>'', 'searchable'=>'true', 'orderable'=>'true', 'search'=>{'value'=>'searchvalue', 'regex'=>'false'}}}
     end
 
     it 'should be orderable' do
       expect(column.orderable?).to eq(true)
     end
 
     it 'should sort nulls last' do
-      expect(column.nulls_last?).to eq(true)
+      expect(column.nulls_last?).to eq(false)
     end
 
     it 'should be searchable' do