ユーザー登録機能つき投稿サイト➀

1,postモデル,コントローラー作成

qiita.rb

1:rails g model post title:string link:string description:text
2:rails db:migrate

3:rails g controller Posts

4:resources :posts
5:root "posts#index"

posts.controller

class PostsController < ApplicationController
    before_action :find_post, only: [:show, :edit, :update, :destroy]

    def index
        @posts = Post.all.order("created_at DESC")
    end

    def show
    end

    def new
        @post = Post.new
    end

    def create
        @post = Post.new(post_params)

        if @post.save
            redirect_to @post
        else
            render "new"
        end
    end

    def edit
    end

    def update
        if @post.update(post_params)
            redirect_to @post
        else
            render "edit"
        end
    end

    def destroy
        @post.destroy
        redirect_to root_path
    end

    private

    def find_post
        #自分のコントローラー内のものを見つける時はparams[:id]、自分のコントローラーに無い時(ex:userコントローラー)はparams[:user_id]で参照
        @post = Post.find(params[:id])
    end

    def post_params
        params.require(:post).permit(:title,:link,:description)
    end
end

index.html.erb

<% @posts.each do |post| %>
<!--postはpost.showへ行く-->
<p><%= post.id %>:<%= link_to post.title,post %></p>
<% end %>

<%= link_to "新規投稿",new_post_path %>

new.html.erb

<h1>post/new</h1>
<%= render "posts/form" %>

show.html.erb

<h1>title:<%= @post.title %></h1>
<h1>link:<%= @post.link %></h1>
<h1>description:<%= @post.description %></h1>
<h1>id:<%= @post.id %></h1>


<%= link_to "編集",edit_post_path(@post) %>
<%= link_to "削除",post_path(@post),method: :delete,data: {confirm:"削除してもいいですか"} %>
<%= link_to "ホーム",root_path %>

edit.html.erb

<h1>編集<h1>
<%= render "posts/form"%>

_form.html.erb

<%= form_for(@post) do |f| %>
   <p>titl:<%= f.text_field :title %></p>
   <p>link:<%= f.text_field :link %></p>
   <p>description:<%= f.text_field :description %></p>
   <p><%= f.button :submit %></p>
<% end %>

12-12/23min