Ruby on Rails - Generating Scaffold with relationship

gistfile1.txt

Scaffold actually provides a way to generate relationships, you should use the :references data type

rails g scaffold Comment body:string author:string post:references

This will generate a migration for the comments table with a post_id field and index for it. The generator will also add belongs_to :post to the Comment model.

It will not however generate the reverse side of the relationship so you'll need to add

has_many :comments

to the Post model yourself. You will also need to add nested resource routing if this is something you need as the generator can not handle this.

I's not necessary run the generate command after put the has_many :comments.

reference: https://stackoverflow.com/questions/13445367/create-relationships-when-scaffolding

Thanks to JamieD.