没有将数组隐式转换为字符串 - Rails Migration

Question

尝试在新机器上启动并运行应用程序。可能会使用Ruby的稍微更新版本（2.3.4 vs 2.3.1），而Rails版本是5.1.3。

这里的迁移：

class AddDragAndDropRules < ActiveRecord::Migration[5.0] 
    def change 
    add_column :products, :fixture_location, :string, default: "none" 
    add_column :products, :attaches_to, :uuid, array: true, default: [] 
    end 
end 

问题时rails db:migrate。

错误：

== 20160928162420 AddDragAndDropRules: migrating ============================== 
-- add_column(:products, :fixture_location, :string, {:default=>"none"}) 
    -> 0.0142s 
-- add_column(:products, :attaches_to, :uuid, {:array=>true, :default=>[]}) 
rails aborted! 
StandardError: An error has occurred, this and all later migrations canceled: 

no implicit conversion of Array into String 
/Users/mike/api/db/migrate/20160928162420_add_drag_and_drop_rules.rb:4:in `change' 
bin/rails:9:in `require' 
bin/rails:9:in `<main>' 
TypeError: no implicit conversion of Array into String 
/Users/mike/api/db/migrate/20160928162420_add_drag_and_drop_rules.rb:4:in `change' 
bin/rails:9:in `require' 
bin/rails:9:in `<main>' 
Tasks: TOP => db:migrate 
(See full trace by running task with --trace) 

任何人都能够发现这个错误吗？

Answer 1

如果这有助于其他任何人 - 项目升级到Rails 5.1.3的某个点，导致UUID阵列迁移由于错误而失败。

问题是在这里（https://github.com/rails/rails/issues/30539）和解决方法在5.1.2-5.1.3是要做到这一点：

add_column :products, :attaches_to, :uuid, array: true, default: '{}' 

应固定在5.1.4及以上。