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# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples

# If not running interactively, don't do anything
case $- in
    *i*) ;;
      *) return;;
esac

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# app/models/post.rb

class Post < ApplicationRecord

  # friendly url
  extend FriendlyId
  friendly_id :title, use: :slugged

end

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# app/controllers/posts_controller.rb

def show
  @post = Post.friendly.find(params[:id])
end

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# config/routes.rb

  match "/404", to: "errors#not_found", via: :all
  match "/422", to: "errors#unacceptable", via: :all
  match "/500", to: "errors#internal_server_error", via: :all

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# app/controllers/errors_controller.rb

# do not forget to delete public/{404, 422, 500}.html
# rm public/{404, 422, 500}.html
class ErrorsController < ApplicationController

  def not_found
    render status: 404
  end

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# config/application.rb

config.exceptions_app = self.routes

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  # 301 redirect from old URLs
  match "/old_path_to_posts/:id", to: redirect("/posts/%{id}s")

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# config/meta.yml

meta_title: "SEO & Ruby On Rails"
meta_description: "The 2018 comprehensive guide on SEO in Rails"
meta_image: "logo.png" # Une image dans votre dossier app/assets/images/
twitter_account: "@RevancheSites"

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# config/initializers/default_meta.rb

# Initialize default meta tags.
DEFAULT_META = YAML.load_file(Rails.root.join("config/meta.yml"))

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# app/helpers/meta_tags_helper.rb

module MetaTagsHelper
  def meta_title
    content_for?(:meta_title) ? content_for(:meta_title) : DEFAULT_META["meta_title"]
  end

  def meta_description
    content_for?(:meta_description) ? content_for(:meta_description) : DEFAULT_META["meta_description"]
  end