rails_action_view.md

Rails Action View scrapbook

http://guides.rubyonrails.org/action_view_overview.html

presenter example

class FileFieldPresenter
  include Rails.application.routes.url_helpers
  include ActionView::Helpers::TagHelper
  include ActionView::Context
  include ActionView::Helpers::TextHelper
  include ActionView::Helpers::UrlHelper

  attr_reader :documents

  def initialize(options)
    @documents = options.fetch(:documents)
  end

  def to_html
    documents
      .map { |document| format_document(document) }
      .join("")
      .html_safe
  end

  private

  def format_document(document)
    content_tag :div, nil, class: 'attachment' do
      concat content_tag(:i, nil,  class: 'fa fa-file-o')
      concat link_to(document.filename, document.attachment.url)
    end
  end
end

Time format

  def creation_date
    created_at.to_formatted_s(:long_ordinal)
  end

Assets

<YourAppName>::Application.assets.find_asset('Rails.png').pathname

Helpers

Resource path helpers and linking to a resource

-# resource e.g.: resource = User.last

= link_to edit_resource_path(resource)

= link_to [:edit, resource]

# app/helpers/application_helper.rb

def delete_button
  link_to resource_path(model), 
    class: %w(destroy button-small),
    data: { confirm: "Are you sure ?" },
    method: :delete do
      content_tag(:i, '', class: "icon-remove") +
      content_tag(:span, 'Delete')
    end
end

Block partial render

in short this is not possible, partials are not designed to pass blocks what you want to use is render layout

<% render :layout => '/shared/panel', :locals => {:title => 'some title'} do %>
  <p>Here is some content</p>
<% end %>

or create a helper that will accept block and pass it as a variable to partial

module ContentHelper
  def content_column_fields(options, &block)
    options.merge!(:block_body => capture(&block))
    render(:partial => 'column_fields', :locals => options)
  end
end

-# app/view/contents/_column_fields.html.haml
%h3 Example #{name}
= block_body

-# app/view/contents/_form.html.haml
[:foo, :bar].each do |column|
  = content_column_fields name: column do
    - radio_button_tag column, true

<h3>Example foo</h3>
<input name="foo" type="radio" value="true">

<h3>Example bar</h3>
<input name="bar" type="radio" value="true">

source

• http://www.igvita.com/2007/03/15/block-helpers-and-dry-views-in-rails/
• http://stackoverflow.com/questions/2951105/rails-render-partial-with-block