attr_accessor returns nil?

Question

I want a temporary attribute which I can use in the controller.
I thought attr_accessor is the best way to do this.
But when I submit the users_binded-input, the following error occurs:

Template is missing: Missing template schedule/invite_now, application/invite_now with {:locale=>[:en], :formats=>[:html], :handlers=>[:erb, :builder, :raw, :ruby, :jbuilder, :coffee]}. Searched in: * ../views

I want to find the user with the users_binded-input in the database, as you can see in the controller.
I don't know how to use the temporary-attribute in the controller.
Should it be Schedule.users_binded or :users_binded or something else?

schedule-model:

class Schedule < ActiveRecord::Base
  attr_accessor :users_binded
end

schedule-view:

<%= form_for @schedule_invite, :as => :schedule, :url => schedule_invite_path, :method => :post, :html => {:class => 'navbar-form', :role => 'login'} do |schedule_form_builder| %>
  <p>
    <strong>..Benutzer:</strong>
    <%= schedule_form_builder.text_field :users_binded, :class => 'form-control', :placeholder => 'Benutzer'%>
  </p>
  <p>
    <strong>Title:</strong><br>
    <%= @schedule_invite.title %>
  </p>
  <p>
    <strong>Ort:</strong><br>
    <%= @schedule_invite.location %>
  </p>
  <p>
    <strong>Datum und Uhrzeit:</strong><br>
    <%= @schedule_invite.date_time.strftime("%A, %d.%m.%Y") %>
    <%= @schedule_invite.date_time.strftime("%H:%M:%S") %>
  </p>
  <p class="pull-right">
    <%= link_to "Zurück", root_path, :class => 'btn btn-danger' %>&nbsp;
    <%= schedule_form_builder.submit 'Termin teilen?', :class => 'btn btn-success' %>
  </p>
<% end %>

schedule-controller:

class ScheduleController < ApplicationController
def invite_now
    begin #try
      #user_name = @schedule_invite.users_binded.to_s
      user_binded = User.find_by_name(:user_binded)
    rescue #catch
      if user_binded.nil?
        flash[:notice] = 'Der Benutzer konnte nicht gefunden werden.'
        @schedule_invite = current_user.schedules.find(params[:id])
        render :action => "invite"
      else
        @schedule_invite = user_binded.schedules.find(params[:id])
        user_binded.schedules << @schedule_invite
        flash[:notice] = 'Der Termin wird nun mit dem Benutzer ' + user_binded.name + 'geteilt.'
        redirect_to :root
      end
    end
  end
end

routes:

post "schedule/invite/:id" => "schedule#invite_now"

---

EDIT:
I changed the controller to this:

def invite_now
    begin #try
      #user_name = @schedule_invite.users_binded.to_s
      user_binded = User.find_by_name(params[:user_binded])
    rescue #catch
      if user_binded.nil?
        flash[:notice] = 'Der Benutzer konnte nicht gefunden werden.'
        @schedule_invite = current_user.schedules.find(params[:id])
        render :action => "invite"
      end
    end

    if user_binded.nil?
      flash[:notice] = 'Der Benutzer konnte nicht gefunden werden.'
      @schedule_invite = current_user.schedules.find(params[:id])
      render :action => "invite"
    else
      @schedule_invite = user_binded.schedules.find(params[:id])
      user_binded.schedules << @schedule_invite
      flash[:notice] = 'Der Termin wird nun mit dem Benutzer ' + user_binded.name + 'geteilt.'
      redirect_to :root
    end
  end

So that I don't need a invite_now.html.erb.
The problem that occurs is the following (maybe there is a attr_accessor-problem):
The SQL-Statement
user_binded = User.find_by_name(params[:user_binded])
returns/loads
User Load (1.0ms) SELECT "users".* FROM "users" WHERE "users"."name" IS NULL LIMIT 1,
so that the attr_accessor isn't correct ?
As Doon said: "attr_accsessor would be used on an instance."
Is the solution the following ?

@schedule_invite = current_user.schedules.find(params[:id])
@schedule_invite.user_binded = User.find_by_name(params[:users_binded])

It only makes sense if the attributes type can be everything (ex. Type of User).
Any Ideas ?

---

EDIT2:
I try to check the params[:users_binded] with the following:
flash[:notice] = params[:users_binded]
and this error occurs:
can't convert nil into String, so that the param users_binded wont be set correctly.

RAJ ... said I should add the params to the question:

private
def schedule_params
  params.require(:schedule).permit(:id, :titel, :location, :date_time)
end

I think here is the problem..

Answer 1

Issue is not related to attr_accessor at all. That's just fine. Problem is with template rendering.

So, you need to add template view invite_now.html.erb in your views/schedule/ directory

Than in your controller:

you need to use params[:schedule][:users_binded] instead of :user_binded. So it will be like

 user_binded = User.find_by_name(params[:schedule][:users_binded])