Question

我正在使用acts_as_list gem，但在创建新的Object时，位置应自动增加大小和订单位置ASC。

LessonPage模型

class LessonPage < ActiveRecord::Base
    acts_as_list :scope => 'lesson_id = #{lesson_id}'
    default_scope order('position ASC')
end

选择

SELECT "lesson_pages".* FROM "lesson_pages" ORDER BY position ASC, "lesson_pages".id desc

插入 - 首先

INSERT INTO "lesson_pages" ("created_at", "lesson_id", "position", "updated_at") VALUES (?, ?, ?, ?)  [["created_at", Sun, 16 Oct 2011 11:55:27 CEST +02:00], ["lesson_id", 2], ["position", 1], ["updated_at", Sun, 16 Oct 2011 11:55:27 CEST +02:00]]

第二

INSERT INTO "lesson_pages" ("created_at", "lesson_id", "position", "updated_at") VALUES (?, ?, ?, ?)  [["created_at", Sun, 16 Oct 2011 11:57:15 CEST +02:00], ["lesson_id", 2], ["position", 2], ["updated_at", Sun, 16 Oct 2011 11:57:15 CEST +02:00]]

第三

INSERT INTO "lesson_pages" ("created_at", "lesson_id", "position", "updated_at") VALUES (?, ?, ?, ?)  [["created_at", Sun, 16 Oct 2011 11:58:13 CEST +02:00], ["lesson_id", 2], ["position", 2], ["updated_at", Sun, 16 Oct 2011 11:58:13 CEST +02:00]]

这里失败了，因为位置应该是3而不是2.如何解决这个问题？谢谢！

Answer 1

我认为这是由commit修复的，但此修复后没有发布。我认为你应该使用github的代码。

使用它：

gem 'acts_as_list', :git => 'https://github.com/swanandp/acts_as_list.git'

rails acts_as_list位置自动增量

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