Rails render partial with block

Here's an alternative based on previous answers.

Create your partial on shared/_modal.html.erb:

<div class="ui modal form">
  <i class="close icon"></i>
  <div class="header">
    <%= heading %>
  </div>
  <div class="content">
    <%= capture(&block) %>
  </div>
  <div class="actions">
    <div class="ui negative button">Cancel</div>
    <div class="ui positive button">Ok</div>
  </div>
</div>

Define your method on application_helper.rb:

def modal_for(heading, &block)
  render(
    partial: 'shared/modal',
    locals: { heading: heading, block: block }
  )
end

Call it from any view:

<%= modal_for('My Title') do |t| %>
  <p>Here is some content to be rendered inside the partial</p>
<% end %>

You can use the capture helper, and even inline in the render call :

<%= render 'my_partial',
           :locals => { :title => "Some Title" },
           :captured => capture { %>
    <p>Here is some content to be rendered inside the partial</p>
<% } %>

and in shared/panel:

<h3><%= title %></h3>
<div class="my-outer-wrapper">
  <%= captured %>
</div>

which will produce:

<h3>Some Title</h3>
<div class="my-outer-wrapper">
  <p>Here is some content to be rendered inside the partial</p>
</div>

See http://api.rubyonrails.org/classes/ActionView/Helpers/CaptureHelper.html

Based on the accepted answer this is what worked well for me using Rails 4.

We can render a panel as such:

= render_panel('Non Compliance Reports', type: 'primary') do
  %p your content goes here!

This requires a helper method and a shared view:

helper method (ui_helper.rb)

def render_panel(heading, options = {}, &block)
  options.reverse_merge!(type: 'default')
  options[:panel_classes] = ["panel-#{options[:type]}"]

  render layout: '/ui/panel', locals: { heading: heading, options: options } do
    capture(&block)
  end
end

View (/ui/panel.html.haml)

.panel{ class: options[:panel_classes] }
  .panel-heading= heading
  .panel-body
    = yield

While both of those answers above work (well the example that tony links to anyway) I ended up finding the most succinct answer in that above post (comment by Kornelis Sietsma)

I guess render :layout does exactly what I was looking for:

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

combined with:

# /shared/_panel.html.erb
<div class="v-panel">
  <div class="v-panel-tr"></div>
  <h3><%= title -%></h3>
  <div class="v-panel-c">
    <%= yield %>
  </div>
</div>