Rails 4 Nested Model : Not working - ruby-on-rails

Question

I was trying to work with simple nested models & forms but have failed eventually. I don't understand what wrong am I doing? Trying to implement simple nested model. A parent having many child. Can anyone please help me out. Thanks.
Here are the models:
parent.rb
class Parent < ActiveRecord::Base
has_many :childs
accepts_nested_attributes_for :childs
end
child.rb
class Child < ActiveRecord::Base
belongs_to :parent
end
parents_controller.rb
class ParentsController < ApplicationController
before_action :set_parent, only: [:show, :edit, :update, :destroy]
# GET /parents
# GET /parents.json
def index
#parents = Parent.all
end
# GET /parents/1
# GET /parents/1.json
def show
end
# GET /parents/new
def new
#parent = Parent.new
#parent.childs.new
end
# GET /parents/1/edit
def edit
end
# POST /parents
# POST /parents.json
def create
#parent = Parent.create(parent_params)
respond_to do |format|
if #parent.save
format.html { redirect_to #parent, notice: 'Parent was successfully created.' }
format.json { render :show, status: :created, location: #parent }
else
format.html { render :new }
format.json { render json: #parent.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /parents/1
# PATCH/PUT /parents/1.json
def update
respond_to do |format|
if #parent.update(parent_params)
format.html { redirect_to #parent, notice: 'Parent was successfully updated.' }
format.json { render :show, status: :ok, location: #parent }
else
format.html { render :edit }
format.json { render json: #parent.errors, status: :unprocessable_entity }
end
end
end
# DELETE /parents/1
# DELETE /parents/1.json
def destroy
#parent.destroy
respond_to do |format|
format.html { redirect_to parents_url, notice: 'Parent was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_parent
#parent = Parent.find(params[:id])
end
def parent_params
params.require(:parent).permit(:name, childs_attributes: [:name])
end
end
parent form.html.erb
<%= form_for(#parent) do |f| %>
<% if #parent.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#parent.errors.count, "error") %> prohibited this parent from being saved:</h2>
<ul>
<% #parent.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label 'Parent name' %><br>
<%= f.text_field :name %>
</div>
<%= f.fields_for :child do |c| %>
<div class="field">
<%= c.label 'Child Name' %><br>
<%= c.text_field :name %>
</div>
<% end %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
The parent is getting created but the child is not. The child table has parent_id for associating both models.
Thanks in advance

Answer 1

I believe the plural of child is not childs, but children, and Rails knows this. You need to change your has_many association accordingly.
EDIT: As #pavan pointed out, change all the occurences in your code, not only the association.