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I wanted to be able to search against a calculated field, and so extended my `get_raw_records` defintion to perform a join+group, as described in [Rails Guides](http://guides.rubyonrails.org/active_re…
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I was building the UI and views when I looked over at the webrick log and came across this:
Started POST "/stories/3/chapters/5" for 127.0.0.1 at 2012-06-01 16:00:07 -0700
Processing by ChaptersCo…
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Why use ActiveRecord and not Kohana native ORM? Are you using http://www.phpactiverecord.org ?
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ModelSchema currently only supports Sequel, even though there are many alternative Ruby ORMs, perhaps most notably ActiveRecord. I'll consider working on an ActiveRecord plugin if there's interest; pl…
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Is there a way to use this extension also within sinatra-activerecord?
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After I installed this gem, I started getting this error below when uploading certain images.
ActiveRecord::StatementInvalid (SQLite3::SQLException: Safety level may not be changed inside a transac…
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For the last 3 months, we got 13 occurrences of similar errors originating from typed store, one example:
```
NameError: undefined method `can_perform_before_type_cast' for class `Activity' (NameE…
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```
list 实现一个可排序、可调整列表项位置的列表。
list
是一个双连接链表,每个元素都连接到前一个项目和后一个��
�目。
list
的优势在于增加项目、删除项目、移动项目位置时速度快(��
�需要更新前后的项
目),缺点是无法按照按照严格索引值访问特定列表项目。��
�如要访问排序位置第三
位的项目,只能从第一个项目开始向后查找。幸运的是我们��
�特定项目的ID记录下
来,以…
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```
versioned 行为插件可以为对象提供版本控制能力。例如 wiki
的文章具备多个版本。
使用 versioned 插件后,可以在数据库中保存对象的多个版本。
生成对象的新版本时,老版本的对象会获得一个新的ID,而最
新的内容则占用现有的
ID。因此,以ID查询对象时,总是会获得最新版本的内容。
versioned 插件提供下列方法:
// 获得当前的版本号
string …