Rails render partial with block - ruby-on-rails

Question

I'm trying to re-use an html component that i've written that provides panel styling. Something like:
<div class="v-panel">
<div class="v-panel-tr"></div>
<h3>Some Title</h3>
<div class="v-panel-c">
.. content goes here
</div>
<div class="v-panel-b"><div class="v-panel-br"></div><div class="v-panel-bl"></div></div>
</div>
So I see that render takes a block. I figured then I could do something like this:
# /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 class="v-panel-b"><div class="v-panel-br"></div><div class="v-panel-bl"></div></div>
</div>
And I want to do something like:
#some html view
<%= render :partial => '/shared/panel', :locals =>{:title => "Some Title"} do %>
<p>Here is some content to be rendered inside the panel</p>
<% end %>
Unfortunately this doesn't work with this error:
ActionView::TemplateError (/Users/bradrobertson/Repos/VeloUltralite/source/trunk/app/views/sessions/new.html.erb:1: , unexpected tRPAREN
old_output_buffer = output_buffer;;#output_buffer = ''; __in_erb_template=true ; #output_buffer.concat(( render :partial => '/shared/panel', :locals => {:title => "Welcome"} do ).to_s)
on line #1 of app/views/sessions/new.html.erb:
1: <%= render :partial => '/shared/panel', :locals => {:title => "Welcome"} do -%>
...
So it doesn't like the = obviously with a block, but if I remove it, then it just doesn't output anything.
Does anyone know how to do what I'm trying to achieve here? I'd like to re-use this panel html in many places on my site.

Answer 1

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>

Answer 2

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 %>

Answer 3

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

Answer 4

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

Answer 5

I think it will work (just did quick dirty test) if you assign it to a variable first and then output it.
<% foo = render :partial => '/shared/panel', :locals =>{:title => "Some Title"} do %>
<p>Here is some content to be rendered inside the panel</p>
<% end %>
<%= foo %>