Rails - Basic Steps VI

Commands

• time_ago_in_words()  - As the name said put a date in words
• redirect_to - Redirect to an URL
• params[:attribute] - Get in the controller the parameters from the session

Authentication

• In the controller root_app\app\controllers\*.rb
• At the beginning of the file add :  before_action :authenticate, except: [:index, :show]
• Where authenticate is a method, that need to be defined
• Then add at the final of the file the method definition

    def authenticate

        authenticate_or_request_with_http_basic do |name, password|

          name == "admin" && password == "123"

        end

    end

Ajax (Video 8 6:56 min)

• In the View root_app\views\post\show.html.erb
• In the form tag, add a parameter to the form_for method:   remote: true
• In the Controller root_app\controller\comment_controllers
• Add the line:  format_js
• If after that you do not specified any file, the default file to consider is method_name.js.erb
• Create a JS cretate.js.erb 
• Create a file in root_app\views\comments and named create.js.erb
• Add the code

var new_comment = $("<%= escape_javascript( render(:partial => @comment))%>").hide();

$('#comments').prepend(new_comment);

$('#comments_<%= @comment.id %>').fadeIn('slow');

$('#new_comment')[0].reset();

escape_javascript() - Ruby validate that the code is valid javascript

• Return to root_app\views\comment\ and Create partial template for the part you want to create dynamically _comment.html.erb
• Add the following lines (this code come from the View) :

<%= div_for comment do %>

      <p>

           <strong> Posted <%= time_ago_in_words(comment.created_at) %>  ago  </strong>

           <br/>

           <%= h(comment.body)  %>

      </p>

<% end %>

In the View root_app\views\post\show.html.erb

Replace the code for show comments for:

<%= render :partial => @post.comments.reverse  %>