controller for favorite

class FavoritesController < ApplicationController
 before_filter :authenticate_user!
 before_action :set_favorite, only: [:show, :edit, :update, :destroy]

  # GET /favorites
  # GET /favorites.json
  def index
    @favorites = current_user.favorites
  end

  # GET /favorites/1
  # GET /favorites/1.json
  def show
  end

  # GET /favorites/new
  def new
    @favorite = Favorite.new
  end

  # GET /favorites/1/edit
  def edit
  end

  # POST /favorites
  # POST /favorites.json
  def create
    @favorite = Favorite.new(favorite_params)

    respond_to do |format|
      if @favorite.save
        format.html { redirect_to @favorite, notice: 'Favorite was successfully created.' }
        format.json { render action: 'show', status: :created, location: @favorite }
        format.js
      else
        format.html { render action: 'new' }
        format.json { render json: @favorite.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /favorites/1
  # PATCH/PUT /favorites/1.json
  def update
    respond_to do |format|
      if @favorite.update(favorite_params)
        format.html { redirect_to @favorite, notice: 'Favorite was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @favorite.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /favorites/1
  # DELETE /favorites/1.json
  def destroy
    @favorite.destroy
    respond_to do |format|
      format.html { redirect_to favorites_url }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_favorite
      @favorite = Favorite.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def favorite_params
      params.require(:favorite).permit(:user_id, :video_id)
    end
  end

create.js.erb

$("<%= escape_javascript(render @user) %>").appendTo("#users");
$("#<%= escape_javascript(@video_id) %>").attr('class', 'small button alert');

view

<h2>Videos</h2>
<ul class="large-block-grid-4 small-block-grid-2 medium-block-grid-3">

    <% @videos.each do |video| %>
    <li>
        <div class="a-video">
            <%= link_to video do %>
            <div class="video-image text-center" style="background-image: url('<%= video.thumbnails[2].url%>')">
                <p class="views"><%= video.views %> views</p>
                <p class="duration"><%= video.time %></p>
            </div>
            <% end %>
            <div class="title">
                <p class="title-and-artist">
                    <%= link_to video.title, video, {:class=>"video-title"} %> </br >by
                    <%= link_to video.artist.name, video.artist, {:class=>"artist-name"} %>
                    <br />
                    <em>
                        tags: 
                        <% if video.tag_list.size > 0 %>
                        <%= video.tag_list %>
                        <% else %>
                        none
                        <% end %>
                    </em>
                    <br />
                    <% if user_signed_in? %>
                    <%= link_to "Favorite", favorites_path(:user_id => current_user.id, :video_id => video.id), { :id=> video.id, :class => 'small button', remote: true } %>
                    <% else %>
                    <%= link_to "Favorite", favorites_path, { :id=> video.id, :class => 'small button' } %>
                    <% end %>
                </p>
            </div>


        </div>
    </li>
    <% end %>
</ul>

<br>
<div class="paginates text-center">
<%= paginate @videos %>
<p><%= page_entries_info @videos %></p>
</div>