Routes:

Rails.application.routes.draw do

	root "posts#index"

	resources :posts do
		resources :comments
	end

end



Post Controller:

class PostsController < ApplicationController


	def index
		@posts = Post.all

		if @posts.blank?
			flash[:alert] = "No posts have been created."
		else
			@posts
		end
	end

	def edit
		@post = Post.find(params[:id])
	end

	def update
		@post = Post.find(params[:id])

		if @post.update(post_params)
			flash[:notice] = "Post has been updated."
			redirect_to @post
		else
			flash.now[:alert] = "Post has not been updated."
			render "edit"
		end
	end

	def create
		@post = Post.new(post_params)

		if @post.save
			flash[:notice] = "Post has been created."
			redirect_to @post
		else
			flash[:notice] = "Post has not been created."
		end
	end

	def new
		@post = Post.new
	end

	def show
		@post = Post.find(params[:id])
		@comment = @post.comments.find(params[:id])
	end

	def destroy
		@post = Post.find(params[:id])
		@post.destroy

		flash[:notice] = "Post has been deleted."
		redirect_to posts_path
	end


	private

	def post_params
		params.require(:post).permit(:title, :author, :body)
	end

end




Comments Controller:

class CommentsController < ApplicationController


	def create
		@post = Post.find(params[:post_id])
		@comment = @post.comments.create(comment_params)
		redirect_to post_path(@post)
	end


	private

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


Comments View Files

_comment.html.erb

<p>
	Author:
	<%= comment.author %>
</p>
<p>
	Body:
	<%= comment.body %>
</p>


_form.html.erb

<%= form_for([@post, @post.comments.build]) do |f| %>
	<p>
		<%= f.label :author %><br />
		<%= f.text_field :author %>
	</p>
	<p>
		<%= f.label :body %><br />
		<%= f.text_area :body %>
	</p>
	<p>
		<%= f.submit %>
	</p>
<% end %>



Post View Files

_form.html.erb

<%= form_for @post do |f| %>
	<p>
		<%= f.label :title %><br />
		<%= f.text_field :title %>
	</p>

	<p>
		<%= f.label :author %><br />
		<%= f.text_field :author %>
	</p>

	<p>

 edit.html.erb

 <h3>Edit Post</h3>

<%= render 'form' %>

index.html.erb

<h1>Overall Posts</h1>

<% @posts.each do |post| %>
	<p>
		<b>Title:</b>
		<%= post.title %>
	</p>
	<p>
		<b>Author:</b>
		<%= post.author %>
	</p>
	<p>
		<b>Body</b>
		<%= post.body %>
	</p>
	<p>
		<%= link_to 'Show', post_path(post) %> |
		<%= link_to 'Edit', edit_post_path(post) %> |
		<%= link_to 'Destroy', post_path(post), method: :delete, data: { confirm: 'Are you sure?' } %>
	</p>
<% end %>

<p><%= link_to "Create New Post", new_post_path %>


new.html.erb

<h3>Create New Post</h3>

<%= render 'form' %>


<p><%= link_to "Posts Index", posts_path %></p>


show.html.erb

<p><%= link_to "Posts Index", posts_path %></p>

<h3>Post's details</h3>

<h3>Title</h3>
<%= @post.title %>

<h3>Author</h3>
<%= @post.author %>

<h3>Body</h3>
<%= @post.body %>

<h2>Recent Comments</h2>

<%= render @comments.comments %>


<h2>Add Comments</h2>

<%= render 'comments/form' %>
		<%= f.label :body %><br />
		<%= f.text_area :body %>
	</p>

	<p>
		<%= f.submit %>
	</p>

<% end %>