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A gem for preventing database queries within templates of Rails applications
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README.md

StrictTemplates Build Status

A gem for ensuring that database queries do not execute while rendering templates in a Rails application.

With great power comes great responsibility. ERB is an extremely flexible templating language, but can also . Gems like bullet are great for detecting N+1 queries within an application. But for those of us that want to go the extra mile and prevent any database access from within a template, this gem is for you.

Doing this helps keep all database access centralized to your controller layer.

Pull Requests welcome to enable other methods of generating responses (RABL, etc.)

Installation

Add this line to your application's Gemfile:

group :development, :test do
  gem 'strict_templates'
end

And then do your normal:

$ bundle

Next, include StrictTemplates::Concern in all controllers you wish to prevent database queries while rendering. If it's a new app, you should include it in your ApplicationController, e.g.

class ApplicationController < ActionController::Base
  include StrictTemplates::Concern
end

Usage

Errors will be raised whenever a request issues a SQL statement from within a template.

It's recommended that you do not raise exceptions within your production or production-like environments. Exceptions can be disabled wholesale with the following Rails config flag:

Rails.application.configure do
  config.strict_templates.raise_on_queries = false
end

Alternatively, you can specify a custom error handler to log the errors or do something else interesting with them:

Rails.application.configure do
  config.strict_templates.error_handler = ->(error) { Bugsnag.report(error) }
end

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/kellysutton/strict_templates. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.

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