ruby-on-rails - Rails5迁移：表没有外键

Question

将我的 Rails 4.2 应用程序迁移到 Rails 5 后，当我尝试从新数据库迁移时，出现以下错误

表“目标”没有 development_plan 的外键

以下是重要的迁移：

1. 使用 add_reference 创建 foreign_key

   class AddDevelopmentPlanToObjectives < ActiveRecord::Migration
     def change
       add_reference :objectives, :development_plan, index: true, foreign_key: true
     end
   end
   

2. 删除外键（产生错误）

   class DropDevelopmentPlans < ActiveRecord::Migration
     def change
       Objective.all.each do |objective|
         company = objective.owner.company
         company.cycles.create name: '4Q 2015', begin_at: Date.today, end_at: 1.year.from_now, current: true unless company.current_cycle
         company.reload
         objective.update cycle: company.current_cycle
       end
       remove_foreign_key :objectives, :development_plan
       remove_reference :objectives, :development_plan, index: true
       drop_table :development_plans
     end
   end
   

迁移中断remove_foreign_key :objectives, :development_plan

有人遇到过这个问题吗？这也发生在其他类似的迁移中......

标签： ruby-on-railsruby-on-rails-4

Answer 1

我相信to_table应该以复数形式倾斜：

remove_foreign_key :objectives, to_table: :development_plans

请参阅rails api 文档。