/ Ruby on Rails
/
method

capture

capture(*args)
public

The capture method allows you to extract part of a template into a variable. You can then use this variable anywhere in your templates or layout.

The capture method can be used in ERB templates…

<% @greeting = capture do %>
  Welcome to my shiny new web page!  The date and time is
  <%= Time.now %>
<% end %>

…and Builder (RXML) templates.

@timestamp = capture do
  "The current timestamp is #{Time.now}."
end

You can then use that variable anywhere else. For example:

<html>
<head><title><%= @greeting %></title></head>
<body>
<b><%= @greeting %></b>
</body></html>

2Notes

Passing arguments to block

stevo · Feb 22, 20117 thanks

To pass arguments to block being captured, just list them as capture method params. I.e.

def export(exportable, export_klass, options={}, &block)
result = ""
#...
if block_given?
  result += capture(my_custom_var_i_want_to_pass_to_block, &block)
end
result
end

Then simply...

<%= export(@a, @b) do |my_custom_var| %>

<% if my_custom_var.nil? %> My custom var is nil!!! <% end %> <% end %>

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