Rails - Apr 2005 - Subclassing generators

I have two generators, one of which depends upon the other. I''d like to
have the second one invoke the first. Instead of doing it via inserting 
a Rails::Generate::Scripts::Generate.new.run
command in the second''s manifest, is there a way to essentially concat 
two manifests so that if I want to rewind the dependent generator''s 
manifest, it will also rewind the base generator''s manifest?

I know this is a little vague - I guess I''d like something like (which 
obviously doesn''t work, just trying to give an idea):

class DerivedGenerator < BaseGenerator
	def manifest
		record |m|
			super.replay(m)
		end
	end
end

Joseph Hosteny wrote:
> I have two generators, one of which depends upon the other. I''d
like to
> have the second one invoke the first. Instead of doing it via inserting
> a Rails::Generate::Scripts::Generate.new.run
> command in the second''s manifest, is there a way to essentially
concat
> two manifests so that if I want to rewind the dependent
generator''s
> manifest, it will also rewind the base generator''s manifest?
> 
> I know this is a little vague - I guess I''d like something like
(which
> obviously doesn''t work, just trying to give an idea):
> 
> class DerivedGenerator < BaseGenerator
>     def manifest
>         record |m|
>             super.replay(m)
>         end
>     end
> end
Use a dependency:

  class SomeGenerator < Rails::Generator::NamedBase
    def manifest
      record do |m|
        # Include some other generator.
        m.dependency ''another_generator_name'', [arg1, arg2], {
options }

	# Include a model.
        m.dependency ''model'', [singular_name], :collision
=> :skip

        # Continue with your own manifest.
        # ...
      end
    end
  end

I''m interested that you picked up on creating new generators; the
framework is rather well-hidden within Rails and lacks a good HOWTO.

Do you find yourself systematically editing the code from
script/generate?  Then write a generator to produce code in your own style.

jeremy

Jeremy,

	Mainly, I just dug through the generators for controllers and models, 
as well as some generators available on the rails homepage. I also 
spent some time reading the code in rails_generator.

	Thanks for the quick answer.

Joe

On Apr 21, 2005, at 12:54 PM, Jeremy Kemper wrote:
> Joseph Hosteny wrote:
>> I have two generators, one of which depends upon the other.
I''d like
>> to
>> have the second one invoke the first. Instead of doing it via 
>> inserting
>> a Rails::Generate::Scripts::Generate.new.run
>> command in the second''s manifest, is there a way to
essentially concat
>> two manifests so that if I want to rewind the dependent
generator''s
>> manifest, it will also rewind the base generator''s manifest?
>>
>> I know this is a little vague - I guess I''d like something
like (which
>> obviously doesn''t work, just trying to give an idea):
>>
>> class DerivedGenerator < BaseGenerator
>>     def manifest
>>         record |m|
>>             super.replay(m)
>>         end
>>     end
>> end
>
> Use a dependency:
>
>   class SomeGenerator < Rails::Generator::NamedBase
>     def manifest
>       record do |m|
>         # Include some other generator.
>         m.dependency ''another_generator_name'', [arg1,
arg2], { options
> }
>
> 	# Include a model.
>         m.dependency ''model'', [singular_name], :collision
=> :skip
>
>         # Continue with your own manifest.
>         # ...
>       end
>     end
>   end
>
> I''m interested that you picked up on creating new generators; the
> framework is rather well-hidden within Rails and lacks a good HOWTO.
>
> Do you find yourself systematically editing the code from
> script/generate?  Then write a generator to produce code in your own 
> style.
>
> jeremy
> _______________________________________________
> Rails mailing list
> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>