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Ruby ActiveRecord Basics Migrations and Relationships Single Table Inheritance

Posted by BEAU WITKA
BEAU WITKA
20,594 Points

'drop table' not migrating when I run 'rake db:migrate' (6:30)

My migration file looks identical to Hampton's and yet when I run 'rake db:migrate' the 'drop_table(:customers)' and 'drop_table(:employees)' aren't migrating. Any idea why?

Also, as you'll see below, when I run 'Account.count' from the Rails console I get '0' whereas Hampton gets '2' (???).

Here's my code from Sublime:

class RemoveOldTables < ActiveRecord::Migration
  def up
    Customer.all.each do |c|
      Account.create(name: c.name, about: c.about)
    end

    Employee.all.each do |e|
      Account.create(name: e.name, email: e.email)
    end

    drop_table :customers
    drop_table :employees
  end

  def down
  end
end

And here's my output in Terminal:

biller [master] :> rake db:migrate
== 20151130193508 RemoveOldTables: migrating ==================================
== 20151130193508 RemoveOldTables: migrated (0.0000s) =========================

biller [master] :> rails console
Loading development environment (Rails 4.2.2)
cannot load such file -- awesome_print
2.2.1 :001 > Account.count
   (0.2ms)  SELECT COUNT(*) FROM `accounts`
 => 0

1 Answer

Nelly Nelly
Nelly Nelly
7,134 Points
Nelly Nelly
Nelly Nelly
7,134 Points

I had the same problem... and fount a solution :)

Maybe it could help people who would have the same issue: in rails c

ActiveRecord::Migration.drop_table(:employees)

ActiveRecord::Migration.drop_table(:customers)

And then create by hand new Accounts

Accounts.create( name: "John", email: "john@doe.com")

And then you can update like Hampton explains:

 a = Account.first  

  Account Load (0.4ms)  SELECT  `accounts`.* FROM `accounts` WHERE `accounts`.`id` = 1 LIMIT 1
=> #<Account id: 1, type: nil, name: "Mark", email: "mark@mark.com", about: nil, created_at: "2016-07-29 21:54:26", updated_at: "2016-07-29 21:54:26">

 a.type = "Employee"    
=> "Employee"

a.save     
   (0.2ms)  BEGIN
  SQL (0.4ms)  UPDATE `accounts` SET `type` = 'Employee', `updated_at` = '2016-07-29 21:56:14' WHERE `accounts`.`id` = 1
   (2.0ms)  COMMIT
=> true