support not mention the controller file name while writing back.

lib/attr_accessible2strong_params.rb

@@ -12,7 +12,7 @@ def self.convert(file_or_dir)
         @files << path if path.end_with? '.rb'
       end
     else
-      @files << file_or_dir
+      @files << file_or_dir if File.exist? file_or_dir
     end
   end
 end

lib/attr_accessible2strong_params/converter.rb

@@ -3,6 +3,7 @@
 
 class AttrAccessible2StrongParams::Converter
   def read_attr_accessible(filename)
+    @model_file_name = filename
     root_node, comments, buffer = parse_file_with_comments(filename)
     aa_nodes = root_node.each_node(:send).select {|n| n.children[1] == :attr_accessible}
     aa_fields = []
@@ -21,7 +22,8 @@ def remove_attr_accessible_from_model(filename, no_rename = false)
     write_file_with_comments(filename, no_aa_node, comments, no_rename)
   end
 
-  def write_controller_with_strong_params(filename, no_rename = false)
+  def write_controller_with_strong_params(filename = nil, no_rename = false)
+    filename = "#{File.dirname @model_file_name}/../controllers/#{@model_class_name.pluralize.underscore}_controller.rb" if filename.nil?
     root_node, comments, buffer = parse_file_with_comments(filename)
     sp_src_buffer = Parser::Source::Buffer.new('(string)')
     sp_src_buffer.source = ModifyControllerRewriter.new(@model_class_name, @model_fields).rewrite(buffer,root_node)

test/test_attr_accessible2strong_params.rb

@@ -27,6 +27,6 @@ def test_remove_attr_accessible_from_model
   def test_write_controller_src
     c = AttrAccessible2StrongParams::Converter.new
     c.read_attr_accessible('test/railsapp/app/models/material_transfer_issue.rb')
-    assert_equal 0, c.write_controller_with_strong_params('test/railsapp/app/controllers/material_transfer_issues_controller.rb', true)
+    assert_equal 0, c.write_controller_with_strong_params(nil, true)
   end
 end