ruby-on-rails-3

Why does PDFKit/wkhtmltopdf hang but renders PDF as expected when Rails app is killed?

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The problem is with wkhtmltopdf itself, specifically, any version after 0.9.9. wkhtmltopdf hangs when run directly from the command-line. Steps to correct: brew uninstall wkhtmltopdf cd /usr/local/Library/Formula/ git checkout 6e2d550 /usr/local/Library/Formula/wkhtmltopdf.rb brew install wkhtmltopdf Then verify the correct version is installed wkhtmltopdf –version which should yield wkhtmltopdf 0.9.9 Citations: https://github.com/mileszs/wicked_pdf/issues/110 http://wearepandr.com/blog/article/homebrew-and-installing-old-package-versions#blog_nav

How do I create a Mailer Observer

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I’m surprised how little there is in Rails’ documentation about this. Basically, ActionMailer in Rails 3 introduces the use of Interceptors (called before the message is sent) and Observers (after the message is sent). To set up an Observer, add the following to an initializer: class MailObserver def self.delivered_email(message) # Do whatever you want with … Read more

Rails: Avoiding duplication errors in Factory Girl…am I doing it wrong?

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Simple answer: use factory.sequence If you have a field that needs to be unique you can add a sequence in factory_girl to ensure that it is never the same: Factory.define :user do |user| sequence(:email){|n| “user#{n}@factory.com” } user.password{ “secret” } end This will increment n each time in order to produce a unique email address such … Read more

Setting up a polymorphic has_many :through relationship

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To create a polymorphic has_many :through, you must first create your models. We will use’Article,’ ‘Category,’ and ‘Tag’ where ‘Tag’ is the join-model and Article is one of many objects which can be “tagged” with a category. First you create your ‘Article’ and ‘Category’ models. These are basic models which do not need any special … Read more