[Ruby on Rails] A memorandum of layout templates
This is the first draft. We would appreciate it if you could point out any deficiencies.
I'm studying Ruby on Rails. I wasn't sure why the content coded in the view file was displayed properly in the browser even though it was not enclosed in the DOCTYPE declaration or HTML tags, but I understood the layout template and it was refreshing, so I will leave it as a memorandum.
What is a layout template?
It is a file that is automatically created in the following directory when you create an application with rails. app/views/layouts/application.html.erb
Normally, from the action defined in the controller, if there is a view file, it seems that the file is called, but in reality, the view file created in the layout template is embedded and returned.
Example) When creating a controller called posts app/controllers/posts_controller.rb
posts_controller.rb
class PostsController < ApplicationController
def index
end
end
app/views/posts/index.html.erb
erb:index.html.erb
<h1>top page</h1>
Actually, what is returned as a response is the view file ** index.html.erb ** called in ** <% = yield%> ** in the
tag of the template file below. It is said that it has been returned.app/views/layouts/application.html.erb
erb:application.html.erb
<!DOCTYPE html>
<html>
<head>
<title>FirstApp</title>
<%= csrf_meta_tags %>
<%= csp_meta_tag %>
<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
<%= javascript_pack_tag 'application', 'data-turbolinks-track': 'reload' %>
</head>
<body>
<%= yield %>
</body>
</html>
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