# Best Way to detect if you are in a migration? **URL:** \ **Category:** Rails\ **Created:** [August 13, 2008, 9:02pm UTC](https://www.ruby-forum.com/t/best-way-to-detect-if-you-are-in-a-migration/145771 "2008-08-13T21:02:34Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![ericgoodwin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/c68b51/32.png) [@ericgoodwin](https://www.ruby-forum.com/u/ericgoodwin)\ **Post date:** [August 13, 2008, 9:02pm UTC](https://www.ruby-forum.com/t/best-way-to-detect-if-you-are-in-a-migration/145771/1 "2008-08-13T21:02:34Z")
I have a method where I would like output to occur via “puts” only if its currently in the middle of a rake task or if its in the middle of a migration. How can I detect if the program execution is in the context of a migration or a rake task? ---
**Author:** ![ericgoodwin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/c68b51/32.png) [@ericgoodwin](https://www.ruby-forum.com/u/ericgoodwin)\ **Post date:** [October 8, 2008, 6:11am UTC](https://www.ruby-forum.com/t/best-way-to-detect-if-you-are-in-a-migration/145771/2 "2008-10-08T06:11:22Z")
Anybody? ---
**Author:** ![ericgoodwin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/c68b51/32.png) [@ericgoodwin](https://www.ruby-forum.com/u/ericgoodwin)\ **Post date:** [October 8, 2008, 6:37am UTC](https://www.ruby-forum.com/t/best-way-to-detect-if-you-are-in-a-migration/145771/3 "2008-10-08T06:37:23Z")
On Aug 14, 3:02 am, Aryk G. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > I have a method where I would like output to occur via “puts” only if > its currently in the middle of a rake task or if its in the middle of a > migration. > > ## How can I detect if the program execution is in the context of a migration or a rake task? > > Posted viahttp://www.ruby-forum.com/. Not sure about this, but I think calling self.class or self.parent inside a migration task (self.up and self.down) should return ActiveRecord::Migration. ---
**Author:** ![ericgoodwin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/c68b51/32.png) [@ericgoodwin](https://www.ruby-forum.com/u/ericgoodwin)\ **Post date:** [February 9, 2009, 9:11pm UTC](https://www.ruby-forum.com/t/best-way-to-detect-if-you-are-in-a-migration/145771/4 "2009-02-09T21:11:48Z")
I im interested in this question, has somebody the answer? ---
**Author:** ![ericgoodwin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/c68b51/32.png) [@ericgoodwin](https://www.ruby-forum.com/u/ericgoodwin)\ **Post date:** [October 8, 2008, 11:21am UTC](https://www.ruby-forum.com/t/best-way-to-detect-if-you-are-in-a-migration/145771/5 "2008-10-08T11:21:31Z")
right, but Im talking about deep in the code, like in an ActiveRecord model lets say. ---
**Author:** ![ericgoodwin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/c68b51/32.png) [@ericgoodwin](https://www.ruby-forum.com/u/ericgoodwin)\ **Post date:** [February 9, 2009, 10:04pm UTC](https://www.ruby-forum.com/t/best-way-to-detect-if-you-are-in-a-migration/145771/6 "2009-02-09T22:04:41Z")
I recently posted a similar question. No answer… [http://groups.google.com/group/rubyonrails-talk/browse\_thread/thread/5d38a62129fa63e4/a78671aa145bf278?hl=en#a78671aa145bf278](http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/5d38a62129fa63e4/a78671aa145bf278?hl=en#a78671aa145bf278) On Feb 9, 3:11 pm, Frantisek P. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![ericgoodwin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/c68b51/32.png) [@ericgoodwin](https://www.ruby-forum.com/u/ericgoodwin)\ **Post date:** [February 10, 2009, 3:01pm UTC](https://www.ruby-forum.com/t/best-way-to-detect-if-you-are-in-a-migration/145771/7 "2009-02-10T15:01:46Z")
Hey guys, i’ve not tested it, but: 1. you are able to set environment variable when runing rake from commandline 2. you are able to test against ENV[:variable] in your code. 3. problem solved? 🙂 here is the inspiration: [http://ryandaigle.com/articles/2007/6/22/using-command-line-parameters-w-rake-and-capistrano](http://ryandaigle.com/articles/2007/6/22/using-command-line-parameters-w-rake-and-capistrano) ---
**Author:** ![ericgoodwin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/c68b51/32.png) [@ericgoodwin](https://www.ruby-forum.com/u/ericgoodwin)\ **Post date:** [February 10, 2009, 3:18pm UTC](https://www.ruby-forum.com/t/best-way-to-detect-if-you-are-in-a-migration/145771/8 "2009-02-10T15:18:48Z")
i once had a similar problem. in my case i wanted to skip some code whenever it is called from a rake task. back then i solved it the way Frantisek P. proposed. still working, no problems. just set your ENV-variable at the beginning of your rake task. ---
**Author:** ![ericgoodwin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/c68b51/32.png) [@ericgoodwin](https://www.ruby-forum.com/u/ericgoodwin)\ **Post date:** [February 10, 2009, 3:04pm UTC](https://www.ruby-forum.com/t/best-way-to-detect-if-you-are-in-a-migration/145771/9 "2009-02-10T15:04:40Z")
Create your own class that inherits ActiveRecord::Migration and use it, defining the behavior you would like to have. - Maurício Linhares [http://alinhavado.wordpress.com/](http://alinhavado.wordpress.com/) (pt-br) | [http://blog.codevader.com/](http://blog.codevader.com/) (en) On Mon, Feb 9, 2009 at 5:11 PM, Frantisek P.