[Rails]Markdown gem

#RailsでMarkdown記法で書ける仕様に実装したいしかもコピペで

gem追加

Gemfile

gem 'redcarpet'

投稿機能の作成

ターミナル

$ rails g scaffold post title:string body:text
$ bundle
$ bundle exec rails db:migrate

helperに実装

post_helper

module PostHelper
    require "redcarpet"
    require "coderay"

    class HTMLwithCoderay < Redcarpet::Render::HTML
        def block_code(code, language)
            language = language.split(':')[0]

            case language.to_s
            when 'rb'
                lang = 'ruby'
            when 'yml'
                lang = 'yaml'
            when 'css'
                lang = 'css'
            when 'html'
                lang = 'html'
            when ''
                lang = 'md'
            else
                lang = language
            end

            CodeRay.scan(code, lang).div
        end
    end

    def markdown(text)
        html_render = HTMLwithCoderay.new(filter_html: true, hard_wrap: true)
        options = {
            autolink: true,
            space_after_headers: true,
            no_intra_emphasis: true,
            fenced_code_blocks: true,
            tables: true,
            hard_wrap: true,
            xhtml: true,
            lax_html_blocks: true,
            strikethrough: true
        }
        markdown = Redcarpet::Markdown.new(html_render, options)
        markdown.render(text)
    end
end

viewに実装

show.html.erb

  <%= markdown(@post.body).html_safe %>

#参考記事
https://qiita.com/hkengo/items/978ea1874cf7e07cdbfc

##git
https://github.com/vmg/redcarpet