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Rails - Basic Steps V

Request Processing

http://localhost:3000/posts/1
  1. Call method show in PostsController class passing the params [:id]
  2. The class' path is  root_app/app/controllers/posts_controller.rb
  3. The show method will use ActiveRecord#find method to retrieve the post with id=1 from the database and assign to variable @post
  4. The controller will pass @post to the view (template file): root_app/app/views/posts/show.html.erb


Session

  • Ex:  session[ :current_user] = user_id
  • flash is part of the session that is clear in each request
    • Ex:  flash[:notice] = 'Post was created'

Views

  • To see the view files
    • Go to root_app/app/views/posts
      • The form is in the file _form.html.erb
  • Embedded Ruby (ERb) is the most common templating framework
    • Takes a .html.erb template file and transform as HTML 
    • <%=    %> the code is assigned to the html file
    • <%  %> the code is only executed
  • Layout
    • The default layout is in root_app/views/layouts/application.html.erb
    • Here contains all the look and feel for the site

Styles

  • Go to root_app/app/assets/stylesheets where are the files

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