# How to determine column data type of nil activerecord attributes?

**URL:** <https://www.ruby-forum.com/t/how-to-determine-column-data-type-of-nil-activerecord-attributes/192083>\
**Category:** Rails\
**Created:** [July 23, 2010, 2:07pm UTC](https://www.ruby-forum.com/t/how-to-determine-column-data-type-of-nil-activerecord-attributes/192083 "2010-07-23T14:07:50Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Lille](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/f4b2a3/32.png) [@Lille](https://www.ruby-forum.com/u/Lille)\
**Post date:** [July 23, 2010, 2:07pm UTC](https://www.ruby-forum.com/t/how-to-determine-column-data-type-of-nil-activerecord-attributes/192083/1 "2010-07-23T14:07:50Z")

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Hi,

How do I query nil activerecord attributes for their schema datatype?  
(I want to select attributes for handling by datatype in a kind of  
metaprogamming approach…)

Thanks,

Lille