#379 Template Handlers pro

Sep 04, 2012 | 12 minutes | Views

Here I will demonstrate creating two template handlers. One for Ruby which is great for JSON or CSV formats. Another for interpreting Markdown which is useful for informational content.

Click to Play Video ▶

Download:
source codeProject Files in Zip (62.3 KB)
mp4Full Size H.264 Video (29 MB)
m4vSmaller H.264 Video (14.4 MB)
webmFull Size VP8 Video (17.1 MB)
ogvFull Size Theora Video (33.2 MB)

Browse Source Code

Resources

Note: In Rails 4 a .ruby template handler will now be provided by default.

          config/initializers/ruby_template_handler.rb
        
ActionView::Template.register_template_handler(:rb, :source.to_proc)

          views/products/index.json.rb
        
@products.map do |product|
  {
    name: product.name,
    price: number_to_currency(product.price),
    url: product_url(product),
    # reviews: product.reviews.map { |r| JSON.parse(render(r)) }
    # reviews/_review.json.rb
  }
end.to_json

          views/products/index.csv.rb
        
response.headers["Content-Disposition"] = 'attachment; filename="products.csv"'

CSV.generate do |csv|
  csv << ["Name", "Price", "URL"]
  @products.each do |product|
    csv << [
      product.name,
      number_to_currency(product.price),
      product_url(product)
    ]
  end
end

          views/products/show.html.rb
        
div_for @product do
  content_tag(:h1, @product.name) +
  content_tag(:p, number_to_currency(@product.price)) +
  link_to("Edit", edit_product_path(@product))
end

          config/initializers/markdown_template_handler.rb
        
class MarkdownTemplateHandler
  def self.call(template)
    erb = ActionView::Template.registered_template_handler(:erb)
    source = erb.call(template)
    <<-SOURCE
    renderer = Redcarpet::Render::HTML.new(hard_wrap: true)
    options = {
      autolink: true,
      no_intra_emphasis: true,
      fenced_code_blocks: true,
      lax_html_blocks: true,
      strikethrough: true,
      superscript: true
    }
    Redcarpet::Markdown.new(renderer, options).render(begin;#{source};end)
    SOURCE
  end
end

ActionView::Template.register_template_handler(:md, MarkdownTemplateHandler)
ActionView::Template.register_template_handler(:markdown, MarkdownTemplateHandler)

          views/info/about.html.md
        
# About Us

**Lorem ipsum dolor sit amet, consectetur adipisicing elit,** sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

[Products Listing](<%= products_path %>)