<%= metric_select_tag 'new_metric', @metric_to_choose, {
:allow_empty => true,
:select2_options => {'placeholder' => "'" + message('comparison.add_metric') + "'"}
} -%>
<%= resource_select_tag 'new_resource', {
:resource_type_property => 'comparable',
:width => '250px',
:select2_options => {'placeholder' => "'" + message('comparison.add_project') + "'"}
} -%>