Generators skip collision check if force option is passed.

railties/CHANGELOG.md

@@ -1,3 +1,7 @@
+* Generators that inherit from NamedBase respect `--force` option
+
+  *Josh Brody*
+
 * Support using environment variable to set pidfile
 
   *Ben Thorner*

railties/lib/rails/generators/base.rb

@@ -252,6 +252,7 @@ module Rails
         def class_collisions(*class_names)
           return unless behavior == :invoke
           return if options.skip_collision_check?
+          return if options.force?
 
           class_names.flatten.each do |class_name|
             class_name = class_name.to_s
@@ -265,7 +266,7 @@ module Rails
             if last && last.const_defined?(last_name.camelize, false)
               raise Error, "The name '#{class_name}' is either already used in your application " \
                            "or reserved by Ruby on Rails. Please choose an alternative or use --skip-collision-check "  \
-                           "to skip this check and run this generator again."
+                           "or --force to skip this check and run this generator again."
             end
           end
         end

railties/test/application/generators_test.rb

@@ -208,5 +208,15 @@ module ApplicationTests
       output = rails("generate", "model", "post", "title:string", "body:string", "--skip-collision-check")
       assert_no_match(/The name 'Post' is either already used in your application or reserved/, output)
     end
+
+    test "force" do
+      rails("generate", "model", "post", "title:string")
+
+      output = rails("generate", "model", "post", "title:string", "body:string")
+      assert_match(/The name 'Post' is either already used in your application or reserved/, output)
+
+      output = rails("generate", "model", "post", "title:string", "body:string", "--force")
+      assert_no_match(/The name 'Post' is either already used in your application or reserved/, output)
+    end
   end
 end