Check whether the given class names are already taken by Ruby or Rails. In the future, expand to check other
namespaces such as the rest of the user’s app.
# File railties/lib/rails_generator/commands.rb, line 157
def class_collisions(*class_names)
# Initialize some check varibles
last_class = Object
current_class = nil
name = nil
class_names.flatten.each do |class_name|
# Convert to string to allow symbol arguments.
class_name = class_name.to_s
# Skip empty strings.
class_name.strip.empty? ? next : current_class = class_name
# Split the class from its module nesting.
nesting = class_name.split('::')
name = nesting.pop
# Extract the last Module in the nesting.
last = nesting.inject(last_class) { |last, nest|
break unless last_class.const_defined?(nest)
last_class = last_class.const_get(nest)
}
end
# If the last Module exists, check whether the given
# class exists and raise a collision if so.
if last_class and last_class.const_defined?(name.camelize)
raise_class_collision(current_class)
end
end
