ruby on rails - Basic ActiveModel methods not working on objects -

i asked question earlier calling associated model attributes.

specifically, asked trying display names of vip model instances associated event.

initially had

<% @organization.events.each |event| %> <p>     <table>         <tr>             <td>                 <%= event.name %>             </td>             <td>                 <%= event.vips.name %>             </td>         </tr>     </table> </p> <% end %> 

which changed

<%= event.vips.first.name %> 

and worked little while. adjusted

<% event.vips.each |vip| %>   <%= vip.name %> 

which worked little while. when came computer after taking break, new event form submissions no longer displaying vip's name on organization show page, though database being updated vip_id foreign key.

in fact, when tried

<%= event.vips.first.name %> 

again, got error saying "undefined method `name' nil:nilclass"

i'm not sure changed, or i'm doing wrong. appreciated.

update:

to clarify problem, following outputs console:

irb(main):005:0> event.first   event load (0.2ms)  select  "events".* "events"  order "events"."id" asc limit 1 => #<event id: 1, when: "2015-08-25 00:00:00", organization_id: 1, created_at: "2015-08-25 04:47:43", updated_at: "2015-08-25 04:47:43", name: "john's event", vip_id: 1>  irb(main):006:0> vip.first   vip load (0.2ms)  select  "vips".* "vips"  order "vips"."id" asc limit 1 => #<vip id: 1, name: "john", created_at: "2015-08-25 04:46:23", updated_at: "2015-08-25 04:46:23", organization_id: 1, event_id: nil>  irb(main):007:0> @organization => #<organization id: 1, name: "test org", created_at: "2015-08-25 04:46:03", updated_at: "2015-08-25 04:46:03", user_id: 1>  irb(main):008:0> @organization.events.first => #<event id: 1, when: "2015-08-25 00:00:00", organization_id: 1, created_at: "2015-08-25 04:47:43", updated_at: "2015-08-25 04:47:43", name: "john's event", vip_id: 1>  irb(main):009:0> @organization.events.first.vips   vip load (0.2ms)  select "vips".* "vips" "vips"."event_id" = ?  [["event_id", 1]] => #<activerecord::associations::collectionproxy []> irb(main):010:0> 

your event has no vips. since event.vips empty array, calling #first on returns nil. try call #name on nil. #name isn't method of nil, hence error undefined method 'name' nil:nilclass.