# Check box form helper

**URL:** <https://www.ruby-forum.com/t/check-box-form-helper/202630>\
**Category:** IT\
**Created:** [February 2, 2011, 5:53pm UTC](https://www.ruby-forum.com/t/check-box-form-helper/202630 "2011-02-02T17:53:31Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\
**Post date:** [February 2, 2011, 5:53pm UTC](https://www.ruby-forum.com/t/check-box-form-helper/202630/1 "2011-02-02T17:53:31Z")

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Con un’associazione many-many mi aspetterei di poter fare:

form\_for @model do |f|

f.check\_box :product\_ids …

cosi’ come si puo’ fare per i text field f.text\_field…

invece la check box non funziona devo per forza usare la check\_box\_tag:

check\_box\_tag “model[product\_ids][]”…

perche’?

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**Author:** ![msan](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/3ab097/32.png) [@msan](https://www.ruby-forum.com/u/msan)\
**Post date:** [February 2, 2011, 6:13pm UTC](https://www.ruby-forum.com/t/check-box-form-helper/202630/2 "2011-02-02T18:13:01Z")

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prova a passargli il parametro {:multiple =\> true}

> **[ActionView::Helpers::FormHelper#check\_box - APIdock](https://apidock.com/rails/v3.0.0/ActionView/Helpers/FormHelper/check_box)**
>
> ActionView::Helpers::FormHelper#check\_box - Ruby on Rails API documentation. View source code and usage examples.

ciao,  
A.

Il 02/02/2011 17:53, Mauro ha scritto:

> check\_box\_tag “model[product\_ids]”…
> 
> perche’?
> 
> * * *
> 
> Ml mailing list  
> [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
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**Author:** ![msan](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/3ab097/32.png) [@msan](https://www.ruby-forum.com/u/msan)\
**Post date:** [February 2, 2011, 7:42pm UTC](https://www.ruby-forum.com/t/check-box-form-helper/202630/3 "2011-02-02T19:42:54Z")

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2011/2/2 Andrea P. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> prova a passargli il parametro {:multiple =\> true}
> 
> [http://apidock.com/rails/v3.0.0/ActionView/Helpers/FormHelper/check\_box](http://apidock.com/rails/v3.0.0/ActionView/Helpers/FormHelper/check_box)

Dice proprio di usare check\_box\_tag per questi casi.  
Ok, ne prendo atto 🙂