anchor.diff:    <div class="form-group">
       <%= f.label :shirt_size, class: "col-sm-2 control-label" %>
       <div class="col-sm-10">
  -      <%= f.select :shirt_size, 
  -            Member.shirt_sizes, 
  -            {}, 
  +      <%= f.select :shirt_size,
  +            Member.shirt_sizes,
  +            {},
               class: "select2 form-control" %>
       </div>
     </div>
  
positive.code:   <div class="form-group">
      <%= f.label :Organizations, class: "col-sm-2 control-label" %>
      <div class="col-sm-10">
        <%= f.collection_select :organization_ids, 
              Organization.order(:name).all, 
              :id, 
              :name, 
              {:include_blank =>'None'}, 
              {multiple: true, class: "select2 form-control"} %>
      </div>
    </div>
    <div class='form-group'>
      <%= f.label :graduation_year, class: "col-sm-2 control-label" %>
      <div class="col-sm-10">
        <%= f.text_field :graduation_year, class: "form-control" %>
      </div>
    </div>
    <div class="form-group">
  
negative.code:   <div class="form-group">
      <%= f.label :identity, class: "col-sm-2 control-label" %>
      <div class="col-sm-10">
        <%= f.select :identity,
              Member.identities,
              {},
              class: "select2 form-control" %>
      </div>
    </div>
  