comments-controller

class CommentsController < ApplicationController

	def create
		@movie = Movie.find(params[:id])
		@comment = @movie.comments.new(comment_params)
		@comment.user = current_user

		if @comment.save 
			redirect_to movie_path(@movie)
		else
			render 'show'
		end
	end

	private
		def comment_params
			params.require(:comment).permit(:author_name, :body)
		end

end

movies-controller

class MoviesController < ApplicationController

	def index
		@movie = Movie.all
	end

	def new
		@movie = Movie.new
	end

	def create
		@movie = Movie.new(movie_params)
		if @movie.save
			flash[:success] = "Novie Added"
			redirect_to @movie
		else
			render 'new'
		end
	end

	def edit
		@movie = Movie.find(params[:id])
	end

	def update
		@movie = Movie.find(params[:id])
		@movie.update(movie_params)
		if @movie.save
			flash[:success] = "Movie Updated"
			redirect_to @movie
		else
			render 'edit'
		end
	end

	def show
		@movie = Movie.find(params[:id])
	end

	def destroy
		@movie = Movie.find(params[:id])
		@movie.destroy
		flash[:success] = "Movie deleted"
		redirect_to root_url
	end

	private
		def movie_params
			params.require(:movie).permit(:title, :description, :image)
		end
end

show.html

.row
	.col-md-3
		.panel.panel-default
			.panel-body
				= image_tag @movie.image.url(:medium) 
				%h1= @movie.title
				%p= @movie.description
		.btn-group
			= link_to "Edit", edit_movie_path(@movie), class: "btn btn-default"
			= link_to "Destroy", movie_path, method: :delete, class: "btn btn-default"

	.col-md-9
		.panel.panel-default
			.panel-heading
				%h5 Comments

			.panel-body
				- @movie.comments.each do |comment|
					%h5= comment.author_name
					%p= comment.body
			.panel-footer
				= simple_form_for @comment do |f|
					= f.input :body, input_html: {class: "form-control"}
					= f.submit "Add Comment", class: "btn btn-default btn-sm"