将哈希添加到ActiveRecord哈希

Question

我看了How to add a Hash object to an ActiveRecord class? Tried but migration fails并按照那里的格式。

我试过了：

class AddTestResponsesToSurveys < ActiveRecord::Migration
    def change
        add_column :surveys, :responses, :hash
    end
end

当我运行rake db:migrate时，我在schema.rb文件中收到错误消息：

# Could not dump table "surveys" because of following StandardError
#   Unknown type 'hash' for column 'responses'

我做错了什么？

Answer 1

使用列类型文本生成迁移

class AddTestResponsesToSurveys < ActiveRecord::Migration
    def change
        add_column :surveys, :responses, :text
    end
end

在您的Survey模型中，添加此

serialize :responses, Hash