First try to provide a generator for Rails 3.x that scaffolds a has_many :through relation. See the stackoverflow question for some context.

To use the generator for "has_many :through", you have to do the following steps:

1. Install the generator by copying the directory "scaffold_hmt" to your rails application in the directory 'lib/generators'.
2. Start the generator by calling from your home directory of the application: rails g scaffold_htm Model1 Model2.
3. The generator will generate or change the following files:
   • Migration <timestamp>_create_<model1>_<model2>.rb
   • Model file <model1>s_<model2>.rb
   • Insert into <model1>.rb and <model2>.rb the has_many :through relations.

The mandatory arguments for the generator are the model names. They will be sorted alphabetically if necessary. If a third argument (the join model name) is given, it will be used, if not, it will be computed:

join table name: `<model1>s_<model2>s`
join model name: `<Model1>s<Model2>`