Question about model associations...

[Darren884]

If I specify a model that has_many of another model and I do the other model as belongs_to when I delete the model with has_many will it delete all of the associated belongs_to if I use the destroy command? Thanks

[Mittineague]

AFAIK, "destroy" only deletes the files created by "generate" (doesn't undo the database).

I have a tutorial app "tasty" http://www.tutorialspoint.com/ruby-o...-2.1/index.htm so I made a copy of it to experiment with.
It has a User model with has_many :entries in it. I did

C:\ruby\tasty>ruby script/destroy model User
    notempty  db/migrate
    notempty  db
          rm  db/migrate/20080904145346_create_users.rb
          rm  test/fixtures/users.yml
          rm  test/unit/user_test.rb
          rm  app/models/user.rb
    notempty  test/fixtures
    notempty  test
    notempty  test/unit
    notempty  test
    notempty  app/models
    notempty  app

*removed 4 files.
It did not delete the "child" models Entry (or Tag or Tagging beneath Entry) and entry.rb still has the belongs_to in it

class Entry < ActiveRecord::Base
 
  validates_uniqueness_of :url
 
  # -- Tell Entry that it has a unique User associated with it.
  belongs_to :user
 
  has_many :taggings
  has_many :tags, :through => :taggings

[scannon]

If I specify a model that has_many of another model and I do the other model as belongs_to when I delete the model with has_many will it delete all of the associated belongs_to if I use the destroy command? Thanks

You can use either of these two destroy child rows:

orders.delete_all
Invokes the association’s delete method on all the child rows.

orders.destroy_all
Invokes the association’s destroy method on all the child rows.


Just replace "orders" with the name of your association.

[Darren884]

Thanks guys.