ruby - Embed a Rails form partial into another page -

i'm building rails 4.2.0 app contact page (this page have semi-empty controller). i'm trying embed form partial controller.

here code (minus text):

<% if user_signed_in? %>  <% render 'enquiries/form' %> <% end %> 

when run error 'first argument in form cannot contain nil or empty'.

my enquiries form looks basic rails form:

<%= form_for @enquiry |f| %>   <% if @enquiry.errors.any? %>    <div id="error_explanation">     <h2><%= pluralize(@enquiry.errors.count, "error") %> prohibited enquiry being saved:</h2>     <ul>     <% @enquiry.errors.full_messages.each |message| %>       <li><%= message %></li>     <% end %>     </ul>    </div> <% end %>   <div class="field">    <%= f.label :subject, "subject:" %><br>    <%= f.text_field :subject %>  </div>  <div class="field">    <%= f.label :e_description, "description:" %><br>    <%= f.text_area :e_description %>  </div>  <div class="actions">    <%= f.submit %>  </div> 

what possible reason error? or there better way of embedding view another?

update/edit:

here's routes:

devise_for :users  resources :rooms     resources :viewings end  resources :rmcats resources :extras resources :extracats resources :enquiries  root :to => redirect('/pages/home')  'pages/home' 'pages/contactus' 

and enquiry controller:

class enquiriescontroller < applicationcontroller   before_action :set_enquiry, only: [:show, :edit, :update, :destroy]   # /enquiries   def index    @enquiries = enquiry.all   end   # /enquiries/1   def show   end   # /enquiries/new   def new    @enquiry = enquiry.new   end   # /enquiries/1/edit   def edit   end   # post /enquiries   def create    @enquiry = enquiry.new(enquiry_params)     if @enquiry.save     redirect_to @enquiry, notice: 'enquiry created.'    else     render :new    end  end   # patch/put /enquiries/1   def update    if @enquiry.update(enquiry_params)     redirect_to @enquiry, notice: 'enquiry updated.'    else     render :edit   end end   # delete /enquiries/1   def destroy    @enquiry.destroy    redirect_to enquiries_url, notice: 'enquiry destroyed.'   end    private    # use callbacks share common setup or constraints between actions.    def set_enquiry     @enquiry = enquiry.find(params[:id])    end     # allow trusted parameter "white list" through.    def enquiry_params     params.require(:enquiry).permit(:subject, :e_description)    end end 

this pages controller:

class pagescontroller < applicationcontroller   around_filter :resource_not_found   # def home   # end   private   # if resource not found redirect root , flash error.   # => pages needed should 404.   def resource_not_found      yield   rescue activerecord::recordnotfound     redirect_to root_url, :notice => "page not found."   end end 

edit:

log:

started "/pages/contactus" ::1 @ 2015-03-21 01:05:25 +0000 processing enquiriescontroller#new html   [1m[35muser load (0.0ms)[0m  select  "users".* "users" "users"."id" = ?  order "users"."id" asc limit 1  [["id", 1]]   rendered enquiries/_form.html.erb (0.0ms)   rendered pages/contactus.html.erb within layouts/application  (0.0ms) completed 200 ok in 235ms (views: 234.6ms | activerecord: 0.0ms) 

it telling @enquiry nil @ time trying render form. need call new action create @enqiury form represent.

you change route to:

get 'pages/contactus' => 'enquiries#new' 

then in enquiry controller:

def new   @enquiry = enquiry.new   render 'pages/contactus' end 

edit:

ok, combine friends systems put in answer:

<% if user_signed_in? %>   <%= render 'enquiries/form' enquiry: @enquiry %> <% end %> 

and change instance of @enquiry in form enquiry

this because need pass variable partial.