沒有將數組隱式轉換爲字符串 - Rails Migration

Question

嘗試在新機器上啓動並運行應用程序。可能會使用Ruby的稍微更新版本（2.3.4 vs 2.3.1），而Rails版本是5.1.3。

這裏的遷移：

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 

問題時rails db:migrate。

錯誤：

== 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) 

任何人都能夠發現這個錯誤嗎？

Answer 1

如果這有助於其他任何人 - 項目升級到Rails 5.1.3的某個點，導致UUID陣列遷移由於錯誤而失敗。

問題是在這裏（https://github.com/rails/rails/issues/30539）和解決方法在5.1.2-5.1.3是要做到這一點：

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

應固定在5.1.4及以上。