ruby on rails - Mested attributes with cocoon gem are not saving in the form and showing in the view -

when enter data form association (lines) , save form. information not saving , gone when got edit form. information not showing in view. seems checkout on end feel i'm missing 1 simple thing.

how can nested attributes save database?

controller

    class lyricscontroller < applicationcontroller     before_action :find_lyric, only: [:show, :edit, :update, :destroy]      def index         @lyric = lyric.published.order("created_at desc").take(1)     end      def show     end      def new         @lyric = lyric.new     end      def create         @lyric = lyric.new(lyric_params)         if @lyric.save             redirect_to @lyric, notice: "successfully created new lyric"         else             render 'new'         end     end      def edit     end      def update         if @lyric.update(lyric_params)             redirect_to @lyric         else             render 'edit'         end      end      def destroy         @lyric.destroy         redirect_to root_path, notice: "successfully deleted recipe"     end      private      def lyric_params         params.require(:lyric).permit(:title, :artist, :song, :link, :published_at, :status, :verse, lines_attributes: [:id, :name, :_destroy])     end      def find_lyric         @lyric = lyric.find(params[:id])     end end 

model

    class lyric < activerecord::base     has_many :lines      scope :draft, ->{where(published_at: nil)}     scope :published, ->{where.not(published_at: nil).where("published_at <= ?", time.now.in_time_zone("eastern time (us & canada)"))}     scope :scheduled, ->{where.not(published_at: nil).where("published_at >= ?", time.now.in_time_zone("eastern time (us & canada)"))}      accepts_nested_attributes_for :lines, reject_if: proc { |attributes| attributes['name'].blank? }, allow_destroy: true       attr_accessor :status       before_validation :clean_up_status       def clean_up_status         self.published_at = case status                             when "draft"                                 nil                             when "published"                                 time.zone.now                             else                                 published_at                             end         true      end end 

model - associations

class line < activerecord::base   belongs_to :lyric end 

show view

<h1> <%= @lyric.title %></h1> <p><%= @lyric.artist %></p>          <ul>         <% @lyric.lines.each |line| %>             <li> <%= line.name %></li>              <% end %>          </ul> <p><%= @lyric.published_at %></p>        <%= link_to 'edit', edit_lyric_path %> |        <%= link_to 'destroy', lyric_path, method: :delete, data: {confirm: "are sure?" } %> 

form

<%= simple_form_for @lyric, html: {multipart:true} |f| %>  <%= f.error_notification %>   <%= f.input :title, label: "title" %>      <%= f.input :artist, label: "artist" %>     <%= f.input :song, label: "song" %>    <%= f.input :link, label: "link", hint: "link track" %>     <%= f.simple_fields_for :lines |line| %>        <%= render 'line_fields', f: line %>      <% end %>      <%= link_to_add_association 'add line', f, :lines %>        <div class="field">     <%= f.label :status %>     <%= f.select :status, ["draft", "published", "scheduled"], selected: status_for(@lyric) %>   </div>        <div class="field published-field">     <%= f.label :published_at, "publish at" %><br>     <%= f.datetime_select :published_at %>   </div>   <%= f.button :submit, "submit", class: "post-button" %>  <% end %>