no method error in posts#edit (take 2) - ruby-on-rails

Question

I posted a question before but my pictures weren't posting so now I am just gonna copy and paste the code. I am trying to make a blogging web app is Rails and I am in the "edit" phase and basically I am getting a no method error.
here is my controller code:
class PostsController < ApplicationController
def index
#post = Post.all
end
def new
#post = Post.new
end
def create
#post = Post.new(post_params)
#post.save
redirect_to show_path(#post)
end
def edit
#post = Post.find(params[:id])
end
def show
#post = Post.find(params[:id])
end
private
def post_params
params.require(:post).permit(:title, :body)
end
end
and here is my edit.html.erb view page
This is the edit page for
<%= form_for #post do |f| %>
<%= f.label :title %>
<%= f.text_field :title %><br />
<%= f.label :body %>:
<%= f.text_field :body %><br />
I am guessing the problem is somewhere in there
here is my routes.rb:
Rails.application.routes.draw do
get "pages/about" => "pages#about"
get "pages/contact" => "pages#contact"
get "/posts" => "posts#index"
post "/posts" => "posts#create"
get "post/:id" => "posts#show", as: :show
get "/posts/new" => "posts#new"
get "post/:id/edit" => "posts#edit", as: :edit_post
end
Please help this is really frustrating :/

Answer 1

You need to add a line in your route file such as:
resources :posts
Also add a update method in your posts_controller:
def update
#post = Post.find(params[:id])
#post.update(post_params)
redirect_to #post
end
I hope this helps you !

Answer 2

When you use form_for like
<%= form_for #post do |f| %>
It's a shorthand for something that looks like this
<%= form_for #post, as: :post, url: post_path(#post), method: :patch, html: { class: "edit_post", id: "edit_post_45" } do |f| %>
So form_for expects that you have defined post_path helper, which you get when you use resources to define your routes, like this
resources :photos
Since you haven't defined your routes like that you don't have path helper that form_for expects and you get an error.

Answer 3

here is the error message:
NoMethodError in Posts#edit
Showing /Users/Hisham/Desktop/Rails_projects/myblog/app/views/posts/edit.html.erb where line #6 raised:
undefined method `post_path' for #<#:0x007fcdc84fd7b8>
Did you mean? posts_path
posts_new_path
font_path
Extracted source (around line #6):
4
5
6
7
8
9
<%= form_for #post do |f| %>
<%= f.label :title %>
<%= f.text_field :title %><br />
Rails.root: /Users/Hisham/Desktop/Rails_projects/myblog
Application Trace | Framework Trace | Full Trace
app/views/posts/edit.html.erb:6:in `_app_views_posts_edit_html_erb___871381459853082993_70260921890920'