anchor.diff:    <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'}, 
  +      <%= 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" %>
  +      <%= f.collection_select :graduating_class,
  +            GraduatingClass.order(:year).all,
  +            :id,
  +            :year,
  +            {include_blank: 'None'},
  +            {class: 'select2 form-control'} %>
       </div>
     </div>
     <div class="form-group">
  
positive.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>
  
negative.code:   <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,
              {},
              class: "select2 form-control" %>
      </div>
    </div>
  