generate category model
factory for category
category test to be valid with name
Test spec for category invalid without name
validate presence of name in category
add belongs_to and has_many assocation, validation for category
add category_id column to businesses
add category_id to business spec
change validate category to category_id in business model
add category id to business_params
add factory for category and test for category select
add sequence generator to category factory, add to create new business test
change edit business test to include category