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Editorial Team
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Asked: 2026-05-20T14:43:16+00:00

We are using Mustache templates and I would like to make a preview View

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We are using Mustache templates and I would like to make a preview View in our RoR web application that combines a template and some data we have stored in our database, but it does not work as I expected and after some searching on the internets (including SO!), I didn’t find any examples that included an active model.

How do you pipe the ActiveModel records to Mustache to merge with a template?

The setup:

The Schema

create_table "templates", :force => true do |t|
  t.string   "kind"
  t.text     "data"
  t.integer  "data_count"
end
create_table "bars", :force => true do |t|
  t.string   "guid"
  t.string   "name"
  t.string   "summary"
end

There is nothing special about the models. Both are subclassed from ActiveRecord::Base

class Bars < ActiveRecord::Base
end
class Templates < ActiveRecord::Base
end

The Controller

class TemplateController < ApplicationController
  def preview
    @result = Mustache.render( template.data, :bars => Bar.limit(template.data_count ) ).html_safe
  end
end

The View

<%= @result %>

The Route

get 'templates/:id/preview' => 'templates#preview', :as => 'templates_preview'

The Data

y Bar.all

--- 
- !ruby/object:Bar
  attributes: 
    guid: "1"
    name: "test1"
- !ruby/object:Bar
  attributes: 
    guid: "2"
    name: "test2"

The Template (i’ve simplified the html for example purposes)

<html>
<head>
</head>
<body>
  {{#bars}}
    <a href="{{guid}}">{{name}}</a>
  {{/bars}}
</body>
</html>

The Result

<html>
<head>
</head>
<body>
    <a href=""></a>
</body>
</html>

The Expectation

<html>
<head>
</head>
<body>
    <a href="1">test1</a><a href="2">test2</a>
</body>
</html>

I am hoping there is an easy answer to this and I am just missing it. Thanks.

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1 Answer

  1. Editorial Team

    Does it work if you change your controller to:

    @result = Mustache.render( template.data, :bars => Bar.limit(template.data_count).all ).html_safe

    (added a call to .all after Bar.limit(template.data_count))

    I’m pretty new to Mustache, but glancing very quickly through the code seems to show that it calls this for a section:

    v = [v] unless v.is_a?(Array) || defined?(Enumerator) && v.is_a?(Enumerator)

    Bar.limit(template.data_count) returns an ActiveRecord::Relation, which is neither an Array nor an Enumerator. Calling .all on the relation turns it into an array and should cause Mustache to pass it into the section accordingly.

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