Ruby on Rails

I am new to rails, And stuck in this problem from last two days I have a student and student_parent model they have a one-to-many relationship i want to build database attribute through one object from form to datase.

controller's method

  def new  @student = Student.new  1.times{ @student.student_parents.build }  .....  .....

end

Create Method:-

def create
 @student = Student.new(params[:student])
 respond_to do |format|
 if @student.save
  format.html { redirect_to Student, notice: 'Student was successfully created.' }
  format.json { render json: @student, status: :created, location: @student }
 else
  format.html { render action: "new" }
  format.json { render json: @student.errors, status: :unprocessable_entity }
 end
end

Model:- class Student < ActiveRecord::Base
 belongs_to :user has_many :student_parents
attr_accessible :birth_date, :blood_group, :first_name, :gender, :last_name, :middle_name, :school_name, :student_rollno, :email, :user_id, :student_parents_attributes
accepts_nested_attributes_for :student_parents end

form:-

  <%= simple_form_for @student, :html => { :class => 'form-horizontal' } do |f| %>   <div class="row-fluid">    <div class="span3">      <%= f.label :first_name, :class => 'control-label',:required => true %>      <%= f.text_field :first_name %>    </div>    <div class="span3">      <%= f.label :middle_name, :class => 'control-label'%>      <%= f.text_field :middle_name %>    </div>    <div class="span3">      <%= f.label :last_name, :class => 'control-label',:required => true %>      <%= f.text_field :last_name %>    </div>  </div> &nbsp;    <div class="control-group">    <label  class = "control-label"> Email </label>    <div class="controls">      <%= f.text_field :email, :class => 'text_field'  %>    </div>  </div>    <div class="control-group">    <label  class = "control-label"> Birth Date <abbr title="required">*</abbr></label>    <div class="controls">      <%= f.text_field :birth_date, :class => 'text_field' ,'data-behaviour' => 'datepicker' %>    </div>  </div>    <% model_class = StudentParent %>    <div class="page-header">      <h4> Parent  Information</h4>    </div>    <%= f.fields_for :student_parents  do |student_parent| %>    <div class="row-fluid">        <!--<div class="span9">-->           <h5> Father Name </h5>           <div class="span3">            <%= student_parent.label :first_name, :class => 'control-label',:required => true %>            <%= student_parent.text_field :first_name %>         </div>           <div class="span3">            <%= student_parent.label :middle_name, :class => 'control-label'%>            <%= student_parent.text_field :middle_name %>         </div>           <div class="span3">            <%= student_parent.label :last_name, :class => 'control-label',:required => true %>            <%= student_parent.text_field :last_name %>         </div>      </div> &nbsp;        <div class="row-fluid">          <h5> Mother Name </h5>          <div class="span3">          <%= student_parent.label :first_name, :class => 'control-label',:required => true %>          <%= student_parent.text_field :first_name %>        </div>          <div class="span3">          <%= student_parent.label :middle_name, :class => 'control-label'%>          <%= student_parent.text_field :middle_name %>        </div>          <div class="span3">          <%= student_parent.label :last_name, :class => 'control-label',:required => true %>          <%= student_parent.text_field :last_name %>        </div>        </div> &nbsp;    <% end %>    <div class="form-actions">    <%= f.button :submit, :class => 'btn-primary' %>    <%= link_to t('.cancel', :default => t("helpers.links.cancel")),                students_path, :class => 'btn' %>  </div>

when submit it only build student information in student table and mother information in student_parent table. But it miss the parent information.

I want to submit student entry in student table &  Father and mother entry simultaneously in student_parents table.

Thanks,

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