Devise Registration Ruby on Rails - Migration Error: Duplicate column name

Question

I'm encountering an issue while running a Rails migration that adds Devise to my Users table. The error message points to a duplicate column name, specifically "email." The migration file causing the problem is located at /Users/jaydenthelwell/pye-candles/pye-candles/db/migrate/20231115201715_add_devise_to_users.rb.

Here is the error:

`➜ pye-candles git:(master) ✗ rails db:migrate == 20231115201715 AddDeviseToUsers: migrating ================================= -- change_table(:users) rails aborted! StandardError: An error has occurred, this and all later migrations canceled:

SQLite3::SQLException: duplicate column name: email /Users/jaydenthelwell/pye-candles/pye-candles/db/migrate/20231115201715_add_devise_to_users.rb:7:in block in up' /Users/jaydenthelwell/pye-candles/pye-candles/db/migrate/20231115201715_add_devise_to_users.rb:5:in up'

Caused by: ActiveRecord::StatementInvalid: SQLite3::SQLException: duplicate column name: email /Users/jaydenthelwell/pye-candles/pye-candles/db/migrate/20231115201715_add_devise_to_users.rb:7:in block in up' /Users/jaydenthelwell/pye-candles/pye-candles/db/migrate/20231115201715_add_devise_to_users.rb:5:in up'

Caused by: SQLite3::SQLException: duplicate column name: email /Users/jaydenthelwell/pye-candles/pye-candles/db/migrate/20231115201715_add_devise_to_users.rb:7:in block in up' /Users/jaydenthelwell/pye-candles/pye-candles/db/migrate/20231115201715_add_devise_to_users.rb:5:in up' Tasks: TOP => db:migrate (See full trace by running task with --trace) ➜ pye-candles git:(master) ✗ `

Here's the relevant the migration file:

`# frozen_string_literal: true

class AddDeviseToUsers < ActiveRecord::Migration[7.0] def self.up change_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, null: false
  # t.datetime :current_sign_in_at
  # t.datetime :last_sign_in_at
  # t.string   :current_sign_in_ip
  # t.string   :last_sign_in_ip

  ## Confirmable
  # t.string   :confirmation_token
  # t.datetime :confirmed_at
  # t.datetime :confirmation_sent_at
  # t.string   :unconfirmed_email # Only if using reconfirmable

  ## Lockable
  # t.integer  :failed_attempts, default: 0, null: false # Only if lock strategy is :failed_attempts
  # t.string   :unlock_token # Only if unlock strategy is :email or :both
  # t.datetime :locked_at


  # Uncomment below if timestamps were not included in your original model.
  # t.timestamps null: false
end

add_index :users, :email,                unique: true
add_index :users, :reset_password_token, unique: true
# add_index :users, :confirmation_token,   unique: true
# add_index :users, :unlock_token,         unique: true

end

def self.down # By default, we don't want to make any assumption about how to roll back a migration when your # model already existed. Please edit below which fields you would like to remove in this migration. raise ActiveRecord::IrreversibleMigration end end

`

I deleted the User migration file as I thought this was causing the issue, the users table also has "email" but the problem persists.

Nimantha · Accepted Answer · 2023-11-16 16:17:01Z

After encountering the SQLite3::SQLException: duplicate column name: email error, I revisited my create_users migration file. The issue arose because the columns Devise was attempting to add were already present in the original migration.

To resolve this, I recreated the users table in my migration as follows:

class CreateUsers < ActiveRecord::Migration[6.0]
  def change
    create_table :users do |t|
      # t.string :email, null: false, default: ""
      # t.string :encrypted_password, null: false, default: ""
      # t.string :reset_password_token
      # t.datetime :reset_password_sent_at
      # t.datetime :remember_created_at
      t.string :first_name
      t.string :second_name
      t.date :d_o_b
      t.string :phone_number
      t.string :address

      ## Other Devise fields if needed

      t.timestamps null: false
    end

    add_index :users, :email, unique: true
    add_index :users, :reset_password_token, unique: true
    # Add other indexes if needed
  end
end

But commented out

  # t.string :email, null: false, default: ""
  # t.string :encrypted_password, null: false, default: ""
  # t.string :reset_password_token
  # t.datetime :reset_password_sent_at
  # t.datetime :remember_created_at

I commented out the columns that Devise was attempting to add (email, encrypted_password, etc.), as these were already included in the original migration. After making this adjustment, the migration ran successfully without any issues.

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