Render Me Pretty


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Let's say you have an error in your ERB template:

line 1
<%= sdsd %>
line 3

Normally, when render it with ERB you get an error message that looks something like this:

   undefined local variable or method `sdsd' for #<RenderMePretty::Context:0x00007fcda414d358>
 (erb):2:in `get_binding'
 ./lib/render_me_pretty.rb:71:in `render'
 ./spec/lib/render_me_pretty/erb_spec.rb:41:in `block (3 levels) in <top (required)>'

Instead, this library produces an output with an error pointing out the original line in the ERB template like so:

NameError evaluating ERB template on line 2 of: spec/fixtures/invalid.erb
1 line 1
2 <%= sdsd %>
3 line 3

The output also colorizes the error line in red so it stands out.


Here's a simple example:

erb ="/path/to/tempate.erb", a: 3) }
erb.render(a: 4)

There's also a convenience class method:

RenderMePretty.result("/path/to/tempate.erb", a: 5)

Layout Support

RenderMePretty.result("/path/to/tempate.erb", layout: "/path/to/layout.erb")

Custom Context

person ="tung")
erb ="/path/to/tempate.erb", a: 3, context: person) } # passing context here
erb.render(a: 4)

person ="tung")
erb ="/path/to/tempate.erb", a: 3) }
erb.render(person, a: 4) # passing context here

The context's methods and instance variables are available in the ERB template. Variables passed at initialization time to or at call time for render be set as instance variables to a clone of the original context object.

So in the case above, if there was an @a instance variable in the Person object, it will not get respected. Instead the value would be @a = 4.


You can pass in a context object also. Examples:

A few more examples are in the erb_spec.rb


Add this line to your application's Gemfile:

gem 'render_me_pretty'

And then execute:

$ bundle


Please fork the project and open a pull request! I'd love your pull requests. Contributions are encouraged and welcomed!

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request