social meta tags helper ruby on rails 4

gistfile1.rb

def social_meta_tags
    title = "#{(content_for?(:title) ? (strip_tags(content_for(:title)).html_safe + ' / ') : '')}#{t('project_title')}"
    description = content_for?(:description) ? content_for(:description) : ''
    image = if @doc.present?
      image_url(@doc.cover_photo.cover.url)
    elsif @main.present?
      image_url(@main.cover_photo.cover.url)
    else
      ''
    end
    content_tag(:title, title) +
    content_tag(:meta, nil, content: title, property: 'og:title') +
    content_tag(:meta, nil, content: description, property: 'og:description') +
    content_tag(:meta, nil, content: "#{request.original_url}?title=#{title}", property: 'og:url') +
    content_tag(:meta, nil, content: image, property: 'og:image') +
    content_tag(:meta, nil, content: title, name: 'title') +
    content_tag(:meta, nil, content: description, name: 'description') +
    content_tag(:link, nil, href: image, rel: 'image_src').html_safe +
    content_tag(:meta, nil, content: 'twitter summary', name: 'twitter:card') +
    content_tag(:meta, nil, content: title, name: 'twitter:title') +
    content_tag(:meta, nil, content: description, name: 'twitter:description') +
    content_tag(:meta, nil, content: image, name: 'twitter:image') +
    content_tag(:meta, nil, content: title, itemprop: 'name') +
    content_tag(:meta, nil, content: description, itemprop: 'description') +
    content_tag(:meta, nil, content: image, itemprop: 'image')
  end

content_tag will do this <meta></meta>