ruby - Rails undefined method but method exists -

maybe i've been staring @ code long, i'm doing seems trivial, yet code still isn't working.

i'm using modal submit parameters controller, should patch object, instead, i'm getting undefined method 'ignore_reason=' nil:nilclass.

the modal

<div class="modal fade" id="deferhostmodal" tabindex="-1" role="dialog" aria-labelledby="deferhostlabel">    <div class="modal-dialog" role="document">      <div class="modal-content">        <div class="modal-header">          <button type="button" class="close" data-dismiss="modal" aria-label="close"><span aria-hidden="true">&times;</span></button>          <h4 class="modal-title" id="deferhostlabel">defer host</h4>        </div>            <div class="modal-body">              <p>defering host means you're choosing ignore security risks neo has identified given host.                host ignored future security score calculations.  filling in information below, defer risk host 30 days.</p>              <br/>              <%= form_for @network_host, url: {controller: "network_hosts", action: "defer_host"} |f| %>                <%= f.hidden_field :id, class: "form-control", required: "required" %>                <%= f.label :ignore_reason, "defer reason" %>                <%= f.text_area :ignore_reason, class: "form-control", required: "required" %>                <br/>                <%= f.label :ignore_name, "your name" %>                <%= f.text_field :ignore_name, class: "form-control", required: "required" %>              </div>            <div class="modal-footer">                <button type="button" class="btn btn-default" data-dismiss="modal">close</button>                <%= f.submit "save changes", class: "btn btn-primary btn-success" %>            </div>          <% end %>      </div>    </div>  </div>

which submits controllers/network_hosts method defer_host:

def defer_host      @network_host = networkhost.where(id: params[:id]).first      @network_host.ignore_reason = params[:ignore_reason]      @network_host.ignore_name = params[:ignore_name]      @network_host.ignore_flag = true      @network_host.ignore_date = 30.days.from_now      @network_host.save        redirect_to root_path    end

i've restarted rails server after latest migration added ignore_reason, ignore_name, ignore_date, ignore_flag.

a sample rails console output of networkhost confirm fields there write to:

#<networkhost id: 76, location_id: 14, mac_address: "d0:63:b4:00:5b:40", ip_address: "10.10.10.106", hostname: "openelec", created_at: "2016-02-19 01:03:24", updated_at: "2016-04-14 19:30:21", deleted_at: nil, os_vendor: "unknown", nickname: nil, vendor: "unknown", os: "unknown", ignore_reason: nil, ignore_name: nil, ignore_date: nil, ignore_flag: nil>

also, confirm parameters being passed, on rails error page (which shows undefined method error), parameters @ bottom:

parameters:    {"utf8"=>"✓",   "_method"=>"patch",   "authenticity_token"=>"a7kb1fdirzjftrr2hbvt/64z02ufxmztfpzgkjowsfi=",   "network_host"=>{"id"=>"76",   "ignore_reason"=>"test defer",   "ignore_name"=>"jf"},   "commit"=>"save changes"}

any appreciated!

it seems @network_host in controller nil cause id key nested in network_host (according params).

params[:id] #=> nil networkhost.where(id: params[:id]).first #=> nil params[:network_host][:id] #=> "76" 

try:

@network_host = networkhost.where(id: params[:network_host][:id]).first #=> #<networkhost id: 76, location_id: 14, mac_address: "d0:63:b4:00:5b:40", ....>