rake db:migrate 報錯

Question

我只是嘗試遷移，但我的控制台返回了這個

標准錯誤：發生錯誤，這次和所有以后的遷移都取消了：

SQLite3::SQLException: 重復列名：encrypted_pa​​ssword: ALTER TABLE "users" ADD "encrypted_pa​​ssword" varchar DEFAULT '' NOT NULL

我知道我不小心創建了兩次表並且必須更改我的遷移文件？ 如果是這樣，我在哪里可以找到它？ 在我的情況下，刪除整個數據庫也是一個很好的解決方案。

我只需要知道怎么做。 到目前為止我找到的所有解決方案都不適合我。

更新：當我做

耙分貝：遷移：向下版本=20160914093125

控制台說

== 20160914093125 DeviseCreateUsers：恢復 ================================ -- remove_index(:users, {:column==> :reset_password_token}) -> 0.0013s -- remove_index(:users, {:column=>:email}) -> 0.0006s -- drop_table(:users) -> 0.0003s == 20160914093125 DeviseCreateUsers: 回復 (0.025s) ======================

這些是我應該改變的點嗎？

3123(...)devise_create_user.rb

class DeviseCreateUsers < ActiveRecord::Migration[5.0]
  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, 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


      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
end

嘗試遷移后的控制台：

== 20160915185631 AddDeviseToUsers：遷移 ================================== -- change_table(:users) rake 中止！ 標准錯誤：發生錯誤，這次和所有以后的遷移都取消了：

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'/Users/matthiascordes/.rvm/gems/ruby-2.3.1/gems/activerecord-5.0.0.1/lib/active_record/migration.rb: ddl_transaction' /Users/matthiascordes/.rvm/gems/ruby-2.3.1/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1210:in :in execute_migration_in_transaction' /matthiascordes/.rvm/gems/ruby-2.3.1/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1183:in block in migrate_without_lock' /Users/matthiascordes/.rvm/gems/ruby-2.3.1/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1182:in每個'/Users/matthiascordes/.rvm/gems/ruby-2.3.1/gems/activerecord-5.0.0.1/lib/ active_record/migration.rb:1182:in migrate_without_lock' /Users/matthiascordes/.rvm/gems/ruby-2.3.1/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1133:in migrate' /Users /matthiascordes/.rvm/gems/ruby-2.3.1/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:1005:in up' /Users/matthiascordes/.rvm/gems/ruby-2.3.1/gems/activerecord-5.0.0.1/lib/active_record/migration.rb:983:in migrate' 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Answer 1

如果您知道要恢復的遷移文件，請使用此文件，

For eg, if this is the migration file,
20123219103503_add_name_field_to_user.rb

然后復制文件中的數字，然后在終端提示中運行以下命令，

rake db:migrate:down VERSION=20123219103503

在遷移文件中制作版本，然后運行

rake db:migrate

從終端

Answer 2

您可能已經手動修改了數據庫架構或更改了正在運行的遷移文件。

如果您不需要數據庫中的數據， rake db:reset將從頭開始重新運行所有遷移。

您還可以嘗試使用以下命令將數據庫遷移到版本 0： rake db:migrate VERSION=0然后運行rake db:migrate

---

如果您想刪除整個數據庫，您可以執行以下任一操作：

rake db:drop只是刪除整個數據庫。

rake db:reset db:migrate將重置您的數據庫並重新加載當前模式。

rake db:drop db:create db:migrate將破壞您的數據庫，然后創建它，然后遷移您當前的架構。

以上3種情況下，所有數據都會丟失。

---

您也可以將遷移文件中的方法注釋掉，然后運行rake db:migrate如下：

正常遷移文件：

class AddEncryptedPaddwordToUsers < ActiveRecord::Migration
  def change
    add_column :users, :encrypted_password, :string
  end
end

只需注釋掉該方法但離開類，所以它是：

class AddEncryptedPaddwordToUsers < ActiveRecord::Migration
  # def change
  #   add_column :users, :encrypted_password, :string
  # end
end

然后運行rake db:migrate 。 本質上，這是一個告訴 rails 跳過遷移的解決方法