Using factory_bot with Sequel Models

factory_bot builds objects. Sequel is a database toolkit with support for models and model validation. It's very easy to use factory_bot to test Sequel models.

Out of the box, factory_bot can build non-persisted instances of Sequel models by calling FactoryBot.build(:symbol). It just can't create them and save them in a single method call with FactoryBot.create(:symbol). In fact, if you try calling factory_bot's create method, you will get an error message that looks like this:

NoMethodError: undefined method `save!' for #<Model:...>

There are two ways around this:

1. Call FactoryBot.build(:symbol) to build a non-persisted Model instance and then call that instance's create() method
2. Modify your FactoryBot definitions to specify a different method to call on create() 

Method #2 is better because your testing code becomes clearer. Just put this at the top of your FactoryBot definitions for Sequel models:

to_create { |i| i.save }

2018-08-12 Edit: 'factory_girl' was renamed to 'factory_bot' in 2017 and I found out about it today :-) Also updated the link to Sequel.