PGError: ERROR: column “email” of relation “users” already exists

问题

I've been developing a website on localhost and it wors fine. This morning, I've tried to push it to heroku using the command "git push heroku master" and then "heroku run rake db:migrate". When I try to do the second one, I have an error:

Connecting to database specified by DATABASE_URL
Migrating to DeviseCreateUsers (20130427200347)
Migrating to CreateAuthentications (20130427210108)
Migrating to AddTokenToAuth (20130427233400)
Migrating to AddNotificationToAuth (20130427234836)
Migrating to AddNotifToUser (20130428031013)
Migrating to AddDeviseToUsers (20130712103048)
==  AddDeviseToUsers: migrating ===============================================
-- change_table(:users)
rake aborted!
An error has occurred, this and all later migrations canceled:

PGError: ERROR:  column "email" of relation "users" already exists
: ALTER TABLE "users" ADD COLUMN "email" character varying(255) DEFAULT '' NOT N
sql_adapter.rb:652:in `async_exec'

I have found someone who had the same issue (heroku PGError: already exists 500 We're sorry, but something went wrong) but in my case the migration "AddDeviseToUsers" is not in the 'db/migrate' folder.

Previous migration affecting users table are :

class DeviseCreateUsers < ActiveRecord::Migration
  def change
  create_table(:users) do |t|
  ## Database authenticatable
  t.string :email,              :null => false, :default => ""
  t.string :encrypted_password, :null => false, :default => ""

  ## Recoverable
  t.string   :reset_password_token
  t.datetime :reset_password_sent_at

  ## Rememberable
  t.datetime :remember_created_at

  ## Trackable
  t.integer  :sign_in_count, :default => 0
  t.datetime :current_sign_in_at
  t.datetime :last_sign_in_at
  t.string   :current_sign_in_ip
  t.string   :last_sign_in_ip

  ## Token authenticatable
  # t.string :authentication_token


  t.timestamps
end

add_index :users, :email,                :unique => true
add_index :users, :reset_password_token, :unique => true
end
end

and

class AddNotifToUser < ActiveRecord::Migration
 def change
  add_column :users, :notif, :string
 end
end

Thanks in advance !!

Edit - answering comments when I run : heroku run rake db:migrate:status

up     20130427200347  Devise create users
up     20130427210108  Create authentications
up     20130427233400  Add token to auth
up     20130427234836  Add notification to auth
up     20130428031013  Add notif to user
down    20130712103048  Add devise to users
down    20130719091217  Create relationships
.
.
.

回答1:

I found the answer at Devise migration on existing model.

What I did was to comment out this line in DeviseCreateUsers migration:

"t.string :email,              :null => false, :default => """

来源：https://stackoverflow.com/questions/18342230/pgerror-error-column-email-of-relation-users-already-exists

标签

ruby-on-rails

heroku

devise

migration