diff options
Diffstat (limited to 'railties/lib/generators/base.rb')
| -rw-r--r-- | railties/lib/generators/base.rb | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/railties/lib/generators/base.rb b/railties/lib/generators/base.rb index e7d0ac80eb..d4bce83161 100644 --- a/railties/lib/generators/base.rb +++ b/railties/lib/generators/base.rb @@ -29,6 +29,39 @@ module Rails protected + # 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. + # + def class_collisions(*class_names) + return unless behavior == :invoke + + class_names.flatten.each do |class_name| + class_name = class_name.to_s + next if class_name.strip.empty? + + # Split the class from its module nesting + nesting = class_name.split('::') + last_name = nesting.pop + + # Hack to limit const_defined? to non-inherited on 1.9 + extra = [] + extra << false unless Object.method(:const_defined?).arity == 1 + + # Extract the last Module in the nesting + last = nesting.inject(Object) do |last, nest| + break unless last.const_defined?(nest, *extra) + last.const_get(nest) + end + + if last && last.const_defined?(last_name.camelize, *extra) + raise Error, "The name '#{class_name}' is either already used in your application " << + "or reserved by Ruby on Rails. Please choose an alternative and run " << + "this generator again." + end + end + end + # Use Rails default banner. # def self.banner |