Update db/migrate after manually updating models?

activerecord, model, rake, ruby-on-rails

Solution

When you ran `rake db:migrate`, it did not create `db/migrate/20120825132038_create_products.rb`. That migration file was created when you ran

rails generate Product order:integer name:string

`attr_accessible` has nothing to do with migrating your database.

I strongly recommend you read the Rails Guide on Migrations, as well as the section on Mass Assignment which discusses `attr_accessible`.

To generate a new migration file (since the one mentioned in your Question has already been processed by the previous `rake db:migrate` command you mentioned running), run

rails g migration AddCategoryIdToProduct category_id:integer

This should generate a new migration with contents like

class AddCategoryIdToProduct < ActiveRecord::Migration
  def change
    add_column :products, :category_id, :integer
  end
end

Running `rake db:migrate` again now will process this migration file, adding the new `category_id` integer column to your `products` table.

Problem

For example i have this model: ``` class Product < ActiveRecord::Base attr_accessible :name, :order end ``` Then when i did `rake db:migrate` it created this db/migrate/20120825132038_create_products.rb: ``` class CreateProducts < ActiveRecord::Migration def change create_table :products do |t| t.integer :order t.string :name t.timestamps end end end ``` But it all happend cuz i used `rails generate Product order:integer name:string` Now after i go to Product model and changes it manually to: ``` class Product < ActiveRecord::Base attr_accessible :name, :order, :category_id validates :name, uniqueness: true belongs_to :category end ``` How can i auto update the db/migrate/20120825132038_create_products.rb with the updates?

Original source