PG::UndefinedTable: ERROR: relation "active_storage_blobs" does not exist

Question

更新应用程序Rails 5.2 到 6，更新添加了以下两个迁移：

    # This migration comes from active_storage (originally 20190112182829)
    class AddServiceNameToActiveStorageBlobs < ActiveRecord::Migration[6.0]
  def up
    unless column_exists?(:active_storage_blobs, :service_name)
      add_column :active_storage_blobs, :service_name, :string

      if configured_service = ActiveStorage::Blob.service.name
        ActiveStorage::Blob.unscoped.update_all(service_name: configured_service)
      end

      change_column :active_storage_blobs, :service_name, :string, null: false
    end
  end
end

和

# This migration comes from active_storage (originally 20191206030411)
class CreateActiveStorageVariantRecords < ActiveRecord::Migration[6.0]
  def up
    create_table :active_storage_variant_records do |t|
      t.belongs_to :blob, null: false, index: false
      t.string :variation_digest, null: false

      t.index %i[ blob_id variation_digest ], name: "index_active_storage_variant_records_uniqueness", unique: true
      t.foreign_key :active_storage_blobs, column: :blob_id
    end
  end
end

尝试运行迁移在标题上出现错误。没有在网上找到任何东西，关于如何修复它有什么想法吗？

Answer 1

active_storage_blobs table 还不存在。您需要先运行:

rails active_storage:install

此命令将在 2 table 秒内添加 2 个迁移：active_storage_attachments 和 active_storage_blobs。

这些新迁移需要运行在您上面的迁移之前。有一个技巧，您可以考虑手动将上面 2 个迁移的文件名中的时间戳更改为比 active_storage:install 将创建的 2 个新迁移更高的时间戳。

所有这些都排序后，运行 rake db:migrate

PG::UndefinedTable: ERROR: relation "active_storage_blobs" does not exist

PG::UndefinedTable: ERROR: relation "active_storage_blobs" does not exist

migration

postgresql

ruby-on-rails

ruby-on-rails-6