1.)
- rails new miniblog - cd miniblog - rails s
2.)
- posts#index
- route => root 'posts#index'
- controller
=> controllers/posts_controller.rb
=> def index; end
- view
=> views/posts/index.html.erb
Hello world!
3.)
- post model
=> rails generate model Post title:string content:text
- migration
=> rails console:
- p = Post.new
- p.title = "hello world"
- p.content = "ipsum lorem larum"
- p.save
~> nochmal ohne save, dann p.persisted?
p = Post.create(:title => "lorem", :content => "ipsum")
Post.create(title: "ipsum", content: "lorem")
Methoden: Post.count, Post.all, Post.order(:created_at => :desc)
Methden, die nur auf Strings angewendet werden können:
p = Post.find(1)
p.title.reverse
p.title.length
p.title.upcase
p.title.size
- posts#index method anpassen
- views/posts/index.erb.html
<%= @posts %>
@posts.inspect, .to_a
4.)
- posts#index view improvements:
- controller: def index ändern
- <%= render @posts %>
- views/posts/_post.html.erb (partial)
<hr>
<h2><%= post.title %></h2>
<p><%= post.content %></p>
5.)
- posts#new (= create)
- $ rake routes
- routes => resources :posts, only: [:index, :new, :create]
- $ rake routes
- new action auf Index-Seite
=> link: <%= link_to "new post", new_post_path %>
- new view
=> hello new post (Formular anlegen)
<%= form_for @post do |f| %>
~> HTML-Vgl.:
<label>Titel: </label>
<input type="text"><br />
<label>Inhalt: </label>
<textarea></textarea>
<button type="submit">Klick mich!</button>
=> <%= link_to 'back', posts_path %>
=> form => <%= render 'form' %>
- posts/_form.html.erb
- implement create action to save new post + redirect
- send to controller => def create; render text: params; end (Zwischenschritt)
=> post_params Methode
- sortieren: Controller --> @posts = Post.order(created_at: :desc)
- Erstellungsdatum anzeigen: _post.html.erb --> <%= l post.created_at, format: :long %>
Optional:
6.)
- add category field to posts => rails g migration add_category_to_post category:string (Alternative Schreibweise: AddCategoryToPost) - show schema.rb - migrate - show schema.rb - add :category to controller permit - add :category to _form - add :category to _post
7.)
- change category field to select => <%= f.select :category, Post::CATEGORIES %> => ins Model: CATEGORIES = [ ["Cooking", "Cooking"], ["Programming", "Programming"], ["Fun", "Fun"], ["Sport", "Sport"], ["Reading", "Reading"] ] 8.) - add comments: => rails generate model Comment user:string content:text - migration