undefined method 'random_generate' for #<Generator:0x4cce798> - ruby-on-rails-3

Question

i have a method which i wan to call from my controller. What i've read in stacks are most of them said to include the method in applicationController.Therefore i did. But still i got the following error. Can some1 help me ? New to rails
APPLICATION CONTROLLER :
helper_method :random_generate
def random_generate
length = #generator.primer_length
chars = 'ATGC'
seq = ''
length.times { seq << chars[rand(chars.size)] }
#generator.random_primer_generated= seq
end
CONTROLLER :
class GeneratorsController < ApplicationController
before_action :set_generator, only: [:show, :edit, :update, :destroy]
after_action :generate_option, only: [:create,:edit]
helper_method :random_primer_generated
# GET /generators
# GET /generators.json
def index
#generators = Generator.all
end
# GET /generators/1
# GET /generators/1.json
def show
end
# GET /generators/new
def new
#generator = Generator.new
end
# GET /generators/1/edit
def edit
end
# POST /generators
# POST /generators.json
def create
#generator = Generator.new(generator_params)
respond_to do |format|
if #generator.save
format.html { redirect_to #generator, notice: 'Generator was successfully created.' }
format.json { render action: 'show', status: :created, location: #generator }
else
format.html { render action: 'new' }
format.json { render json: #generator.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /generators/1
# PATCH/PUT /generators/1.json
def update
respond_to do |format|
if #generator.update(generator_params)
format.html { redirect_to #generator, notice: 'Generator was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #generator.errors, status: :unprocessable_entity }
end
end
end
# DELETE /generators/1
# DELETE /generators/1.json
def destroy
#generator.destroy
respond_to do |format|
format.html { redirect_to generators_url }
format.json { head :no_content }
end
end
def generate_option
if params[:choice] == 'Randomly'
#generator.random_generate
end
#generator.save!
end
private
# Use callbacks to share common setup or constraints between actions.
def set_generator
#generator = Generator.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def generator_params
params.require(:generator).permit(:primer_length, :choice, :random_primer_generated)
end
end
VIEW:
<%= form_for (#generator ) do |f| %>
<% if #generator.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#generator.errors.count, "error") %> prohibited this generator from being saved:</h2>
<ul>
<% #generator.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<label>Primer Length</label><br>
<%= f.number_field :primer_length %>
</div>
<label>Selection :</label><br>
<label>Randomly</label>
<%= radio_button_tag(:choice, 'Randomly')%>
<%= button_to('Generate',generate_option_generator_path(#generator))%>
<% end %>

Answer 1

If you want to call random_generate on the #generator, you have to implement that method in the Generator class. What you have done is implemented it in the ApplicationController, so you would have to call it without referencing to #generator.
Also, I think calling helper_method :random_generate is only required if you want to call random_generate as a controller method inside of a view.