才华横溢 form 案例教学

cd workspace
rails new form
cd form
git init
git status
git add .
git commit -m "initial commit"
git remote add origin https://github.com/shenzhoudance/form.git
git push -u origin master
rails server

git checkout -b posts
rails g model post title:string content:text
rake db:migrate
rails g controller posts
rails server

config/routes.rb
---
Rails.application.routes.draw do
 resources :posts
 root 'posts#index'
end
---
app/controllers/posts_controller.rb
---
class PostsController < ApplicationController
 def index
 end
end
---
app/views/posts/index.html.erb
---
<h1>欢迎来到才华横溢的世界</h1>
---

rake routes
rails server

git status
git add .
git commit -m "add post model & controller & index"
git push origin posts

git checkout -b gem
https://rubygems.org/
gem 'haml', '~> 5.0', '>= 5.0.4'
gem 'bootstrap-sass', '~> 3.3', '>= 3.3.7'
gem 'simple_form', '~> 3.5', '>= 3.5.1'
gem 'devise', '~> 4.4', '>= 4.4.3'
bundle install
rails generate simple_form:install --bootstrap

app/views/posts/index.html.haml
---
%h1 欢迎来到才华横溢的世界
app/assets/stylesheets/application.css.scss
---
@import “ bootstrap-sprockets ”;
@import “ bootstrap ”;
---
app/assets/javascripts/application.js
---
//= require bootstrap-sprockets
//= require turbolinks

app/controllers/posts_controller.rb
---
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
        @post = Post.find(params[:id])
    end

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

app/views/posts/_form.html.haml
---
= simple_form_for @post do |f|
    = f.input :title
    = f.input :content
    = f.submit
---
app/views/posts/new.html.haml
---
%h1 New Post

= render 'form'
---
app/views/posts/edit.html.haml
---
%h1 Edit Post

= render 'form'

= link_to "Cancel", post_path
---
app/views/posts/show.html.haml
---

%h1= @post.title
%p= @post.content

= link_to "Edit", edit_post_path(@post), class: "button"
= link_to "Delete", post_path(@post), method: :delete, data: { confirm: "Are you sure you want to do this?" }, class: "button"
---
app/views/posts/index.html.haml
---
- @posts.each do |post|
        .post
        %h2.title= link_to post.title, post
        %p.date
                Published at
                = time_ago_in_words(post.created_at)

= link_to "New Post", new_post_path, class: "btn btn-default btn-lg"

---

git checkout -b devise
rails generate devise:install
rails g devise:views
rails generate devise user
rake db:migrate
---
git status
git commit -m "add devise user"
git push origin devise
---
rails server
http://localhost:3000/users/sign_up

app/controllers/posts_controller.rb
---
class PostsController < ApplicationController
  before_action :find_post, only: [:show, :edit, :update, :destroy]
  before_action :authenticate_user!, except: [:index, :show]
    def index
        @posts = Post.all.order("created_at DESC")
    end

    def show
    end

    def new
        @post = current_user.posts.build
    end

    def create
        @post = current_user.posts.build(post_params)
  ---

app/models/post.rb
---
class Post < ApplicationRecord
  belongs_to :user
end
---
app/models/user.rb
---
class User < ApplicationRecord
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
   has_many :posts
end

rails g migration add_user_id_to_posts user_id:integer
rake db:migrate

rails c
2.3.1 :001 > @post = Post.first
2.3.1 :002 > @post = Post.last
2.3.1 :003 > @post.user_id = 1
2.3.1 :004 > @post.save
2.3.1 :005 > @post = Post.find(3)
2.3.1 :006 > @post.user_id = 1
2.3.1 :007 > @post.save
2.3.1 :007 > exit
---

git status
git add .
git commit -m "add user find post"
git push origin devise

git checkout -b nav-style
app/assets/stylesheets/application.css.scss
---
@import "bootstrap-sprockets";
@import "bootstrap";

body {
 font-family: 'Lato', sans-serif;
 background: #EDEFF0;
}

.wrapper {
 width: 60%;
 max-width: 1140px;
 margin: 0 auto;
}

.clearfix:before, .clearfix:after {
 content: " ";
 display: table;
}

.clearfix:after {
 clear: both;
}

.main_header {
 width: 100%;
 margin: 0 auto;
 background: white;
 #logo {
   float: left;
   a {
     line-height: 60px;
     text-transform: uppercase;
     font-weight: 700;
     letter-spacing: -1px;
     font-size: 1.8rem;
     text-decoration: none;
     color:#397CAC;
   }
 }
 #buttons {
   float: right;
   a {
     line-height: 60px;
     background: #397CAC;
     padding: .5em 1em;
     border-radius: 0.2em;
     color: white;
     text-decoration: none;
     font-weight: 100;
   }
 }
}

#posts {
 background: white;
 padding: 2em 5%;
 border-radius: .5em;
 .post {
   margin: 1em 0;
   padding: 1em 0;
   border-bottom: 1px solid #D1d1d1;
   .title {
     margin: 0;
     a {
       color: #397CAC;
       text-decoration: none;
       font-weight: 100;
       font-size: 1.25rem;
     }
   }
   .date {
     margin-top: .25rem;
     font-size: 0.9rem;
     color: #B2BAC2;
   }
 }
}

.button {
 color: #397CAC;
 border: 1px solid #397CAC;
 padding: .5em 1em;
 border-radius: 0.2em;
 text-decoration: none;
 margin-right: 2%;
}

#post_content {
 background: white;
 padding: 2em 5%;
 border-radius: .5em;
 h1 {
   font-weight: 100;
   font-size: 2em;
   color: #397CAC;
   margin-top: 0;
 }
 p {
   color: #B2BAC2;
   font-size: 0.9rem;
   font-weight: 100;
   line-height: 1.5;
 }
 }
---
app/views/layouts/application.html.haml
---
!!!
%html
%head
    %title XiaoWei Forum
    = stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track' => true
    %link{ rel: "stylesheet", href: "http://fonts.googleapis.com/css?family=Lato:300,400,700", type: "text/css"}
    %link{:rel => "stylesheet", :href => "http://cdnjs.cloudflare.com/ajax/libs/normalize/3.0.1/normalize.min.css"}/
    = javascript_include_tag 'application', 'data-turbolinks-track' => true
    = csrf_meta_tags
%body
    %header.main_header.clearfix
        .wrapper
            #logo
                %p= link_to "XiaoWei Forum", root_path
            #buttons
                - if user_signed_in?
                    = link_to "New Post", new_post_path
                - else
                    = link_to "Sign Up", new_user_registration_path
                    = link_to "Sign In", new_user_session_path
    .wrapper
        %p.notice= notice
        %p.alert= alert
    .wrapper
        = yield
---

git checkout -b model_comment
rails g model Comment comment:text post:references user:references
rake db:migrate
rails g controller Comments

app/models/post.rb
---
class Post < ApplicationRecord
  belongs_to :user
  has_many :comments
end
---
app/models/user.rb
---
class User < ApplicationRecord
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
   has_many :posts
   has_many :comments
end
---
app/controllers/comments_controller.rb

rails c
Comment
Comment.connection
Comment
Comment.last
Comment.last
@comment.user_id = 1
@comment = save
@comment
Comment.last
User
Post
@comment = comment.all
@comment.destroy
Comment.all
Comment.destroy_all