Noob ? - Foreign Key

rubyonrails-talk
1

I am attempting to use scaffolding to create a simple foreign key example. But I am not quite understanding how rails writes data into the foreign table. When the "belongs_to" and "has_many" lines are added into model, will rails automatically add the information into the foreign table? Or do I have to modify the controller to insert the data into the foreign table? Could someone give me an example. I would like the data in the foreign table not to repeat itself.

The sample tables I am attempting to work with are Parts and Revisions. Where each revision has_many parts and each part belongs_to revision.

Thanks for any Help!!!

Lewis

2

ok, so if parts belongs_to Revision, it must have a revision_id which you must have created in the migration.

Assuming you have a form that sends the Parts data (in params[:parts] and you know to which revision it should be added, then

@revision = Revision.find(revision_id) # however you get revision id, could eg be params[:revision_id] @revision.parts.create(params[:parts])

would be all you need. First line getting the revision, next line adding the part to that revision. revision_id is set by Rails