# Generator simple question: How to specify parameter?

**URL:** <https://www.ruby-forum.com/t/generator-simple-question-how-to-specify-parameter/137869>\
**Category:** Rails\
**Created:** [May 17, 2008, 4:50am UTC](https://www.ruby-forum.com/t/generator-simple-question-how-to-specify-parameter/137869 "2008-05-17T04:50:48Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![goodwill](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/ac8455/32.png) [@goodwill](https://www.ruby-forum.com/u/goodwill)\
**Post date:** [May 17, 2008, 4:50am UTC](https://www.ruby-forum.com/t/generator-simple-question-how-to-specify-parameter/137869/1 "2008-05-17T04:50:48Z")

</div>

I wonder if I have did something fishy here (probably I did…)  
when I type:

script/generate scaffold model --skip\_migration

It saids:  
invalid option: --skip\_migration

Perhaps some syntax I don’t know on how to specify parameters for a  
generator?

---

<div class="post-metadata">

**Author:** ![goodwill](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/ac8455/32.png) [@goodwill](https://www.ruby-forum.com/u/goodwill)\
**Post date:** [May 17, 2008, 5:43am UTC](https://www.ruby-forum.com/t/generator-simple-question-how-to-specify-parameter/137869/2 "2008-05-17T05:43:24Z")

</div>

Try --skip-migration, i.e., use a hyphen instead of an underscore.

In case you didn’t know, you can run script/generate w/o arguments to  
see what generators are installed, and you can run it with a generator  
name, e.g., scaffold, to see what you can do with that generator.

Regards,  
Craig