Creating excel spreadsheets (with charting) has never been easier. This looks like an amazing bit of code if you’re writing a data driven app that requires exporting to excel!
gem install axlsx
Technologies & Coding
Rails Validating Field vs Association
One really interesting thing I came across recently is validating a field vs association. I’ve always written something like this (assume this is a… Company model with a attribute called owner_id and a belongs_to association called owner):
validates_presence_of :owner_id
What’s better to write is:
validates_presence_of :owner
This actually makes sure that your :owner_id actually maps to a real object in the database. So you can’t just set a random integer as owner_id and get away with it!
Sadly this has made testing a little bit harder. Tearing through FactoryGirl documentation again now!