# 1. Create a factory for the model (e.g., User) using FactoryBot
FactoryBot.define do
factory :user do
# Define attributes for the user model
name { "John Doe" }
email { "[email protected]" }
end
end
# 2. Attempt to create an instance of the model using the factory
user_instance = FactoryBot.create(:user)
# 3. Define a method_missing method in the User model
class User
def method_missing(method_name, *args, &block)
# Attempt to find a trait with the same name as the missing method
if FactoryBot::DefinitionProxy.method_defined_within_traits?(method_name)
# If found, apply the trait and recreate the instance
FactoryBot.create(:user, method_name)
else
# If not found, raise a NoMethodError
super
end
end
end
# 4. Call the missing method (e.g., missing_trait) on the user instance
user_instance.missing_trait
# 5. Encounter a NoMethodError since the missing_trait method is undefined
# within the User model and no corresponding trait is defined in the factory