Rails core - May 2013 - model generator

I have a question but I since I do not understand thor so much I would like 
to have feed back from anyone that would like to help me here.

While going through the code in:

rails <https://github.com/rails/rails> /
activerecord<https://github.com/rails/rails/tree/master/activerecord>
 / lib <https://github.com/rails/rails/tree/master/activerecord/lib> /
rails<https://github.com/rails/rails/tree/master/activerecord/lib/rails>
 /
generators<https://github.com/rails/rails/tree/master/activerecord/lib/rails/generators>
 /
active_record<https://github.com/rails/rails/tree/master/activerecord/lib/rails/generators/active_record>
 /
model<https://github.com/rails/rails/tree/master/activerecord/lib/rails/generators/active_record/model>
 / *model_generator.rb*

there is this piece of code:

      def create_migration_file
        return unless options[:migration] && options[:parent].nil?
        attributes.each { |a| a.attr_options.delete(:index) if a.reference? 
&& !a.has_index? } if options[:indexes] == false
        migration_template 
"../../migration/templates/create_table_migration.rb", 
"db/migrate/create_#{table_name}.rb"
      end

It looks that model generator is coupled to migration generator. My 
question is if it would not be more proper to invoke the migration 
generator instead of creating the migration template file here. Migration 
generator should be the only one creating migration files. So by invoking 
the migration generator both migration and model generators would be 
decoupled.

I tried to do something like:

      def create_migration_file
        return unless options[:migration] && options[:parent].nil?
        attributes.each { |a| a.attr_options.delete(:index) if a.reference? 
&& !a.has_index? } if options[:indexes] == false
        invoke :migration, ["create_#{table_name}"]
      end

but arguments from CLI are not being passed. 

I tried to hack a bit and even when I passed the args to the invoke call 
then I have a problem with the options

Is there a way to do what I have in mind or thor does not allow to do this?

Waiting for feedback.

Thank you

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