How to render erubi template to html?

user_788700 0
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As rails 5.1+ switched to erubi I tried to use that in ruby script:

require 'erubi'

template = Erubi::Engine.new("<%= test %>", escape: true)

However I'm stacked trying to render that template to html.

erubi source code: https://github.com/jeremyevans/erubi


erubi is fork of erubis, and in erubis the rendering is done via result method:

require 'erubis'

template = Erubis::Eruby.new("<%= test %>", escape: true)
template.result test: "<br>here" #=> "&lt;br&gt;here"

However there's no result method in erubi.

erb ruby
2 Answers

From the Erubi README (it says “for a file” but it appears to mean “for a template”):

Erubi only has built in support for retrieving the generated source for a file:

require 'erubi'
eval(Erubi::Engine.new(File.read('filename.erb')).src)

So you will need to use one of the eval variants to run from a standalone script.

template = Erubi::Engine.new("7 + 7 = <%= 7 + 7 %>")
puts eval(template.src)

Outputs 7 + 7 = 14.

If you want to be able to use instance variables in your template as you might be used to from Rails, Sinatra etc., you will need to create a context object and use instance_eval:

class Context
  attr_accessor :message
end

template = Erubi::Engine.new("Message is: <%= @message %>")
context = Context.new
context.message = "Hello"

puts context.instance_eval(template.src)

Outputs Message is: Hello.

user_2147900

In rails 5.1 I switched out the Erubis::Eruby.new code to the following:

ActionController::Base.render(inline: "<%= test %>", locals: {test: "<br>here"})

Rails will do the heavy lifting.

user_20314230
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