What causes foreign key = nil? - ruby-on-rails

Question

Generator has_many results
Result belongs_to generator
When i run rails console : Result.find(1) , the generator_id= nil. Why is this so ??? When i'm creating the data , the routes are like this :
localhost:3000/generator/1/results/new
It has got no error with the following code. BUt how come when i have this in my Generator/index.html
<% generator.results.each do |result| %>
<td><%= result.ncbi_ref_seq %></td>
<td><%= result.genome_sample %></td>
<td><%= result.binding_times %></td>
<%end%>
they're empty. Whereas the #generators.each do |generator| gives me the values of the generator. In other words, the result's value belonging to this generator is empty but the generator values are shown. What i want is to have all generators and their result value to be shown. Can some1 help me ?
Generator.model
class Generator < ActiveRecord::Base
has_many :results , :dependent => :destroy
attr_accessible :choice, :primer_length, :random_primer_generated, :genome_sample, :generator_id
GeneratorController.rb
def index
#generators = Generator.all
end
def create
#generator = Generator.new(generator_params)
#generator.choice = params[:choice]
if params[:choice] == 'Randomly'
#generator.random_generate(generator_params)
elsif params[:choice] == 'No_of_ATGC'
#generator.no_ATGC(params[:no_A],params[:no_T],params[:no_G],params[:no_C])
elsif params[:choice] == 'Seating'
#generator.seating(params[:user_seq])
end
#generator.result_choice=params[:result_choice]
respond_to do |format|
if #generator.save
if #generator.result_choice == 'Yes'
format.html { redirect_to(new_generator_result_path(#generator)) }
else
format.html { redirect_to #generator, notice: 'Result was successfully created.' }
format.json { render action: 'show', status: :created, location: #generator }
end
else
format.html { render action: 'new' }
format.json { render json: #generator.errors, status: :unprocessable_entity }
end
end
end
Result Model
class Result < ActiveRecord::Base
attr_accessible :ncbi_ref_seq,:genome_seq, :genome_sample
belongs_to :generator, foreign_key: "generator_id"
ResultController
def index
#results = Result.all
end
def create
#result = Result.new(result_params)
#result.generate_result(result_params)
respond_to do |format|
if #result.save
format.html { redirect_to #result, notice: 'Result was successfully created.' }
format.json { render action: 'show', status: :created, location: #result }
else
format.html { render action: 'new' }
format.json { render json: #result.errors, status: :unprocessable_entity }
end
end
end
schema.rb
create_table "generators", force: true do |t|
t.integer "primer_length"
t.integer "no_A"
t.integer "no_T"
t.integer "no_G"
t.integer "no_C"
t.string "choice"
t.string "random_primer_generated"
t.string "user_seq"
t.string "c_primer"
t.string "result_choice"
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "results", force: true do |t|
t.integer "generator_id"
t.string "ncbi_ref_seq"
t.string "genome_seq"
t.string "genome_sample"
t.integer "binding_times"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "results", ["generator_id"], name: "index_results_on_generator_id"
create_table "results_{:column_options=>{:null=>true}}", id: false, force: true do |t|
t.integer "result_id", null: false
t.integer "{:column_options=>{:null=>true}}_id", null: false
t.integer "generator_id"
t.string "ncbi_ref_seq"
t.string "genome_seq"
t.string "genome_sample"
t.integer "binding_times"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "results_{:column_options=>{:null=>true}}", ["generator_id"], name: "index_results_{:column_options=>{:null=>true}}_on_generator_id"