ruby-on-rails - PG::UndefinedTable: 错误: 关系 "active_storage_blobs"不存在

Question

将应用程序 Rails 5.2 更新为 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

尝试运行迁移会在标题上出现错误。网上没找到，有什么解决办法吗？

Answer 1

active_storage_blobs表尚不存在。您需要先运行:

rails active_storage:install

此命令将为 2 个表添加 2 个迁移: active_storage_attachments和 active_storage_blobs .

这些新的迁移需要在您上面的迁移之前运行。对此有一个技巧，您可以考虑手动将上述 2 个迁移文件名中的时间戳更改为高于 2 个新迁移的时间戳 active_storage:install将创建。

一旦所有这些都被排序，运行 rake db:migrate