# Form builder

**URL:** <https://www.ruby-forum.com/t/form-builder/116881>\
**Category:** Rails\
**Created:** [October 10, 2007, 6:58pm UTC](https://www.ruby-forum.com/t/form-builder/116881 "2007-10-10T18:58:14Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![linojon](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/b3f665/32.png) [@linojon](https://www.ruby-forum.com/u/linojon)\
**Post date:** [October 10, 2007, 6:58pm UTC](https://www.ruby-forum.com/t/form-builder/116881/1 "2007-10-10T18:58:14Z")

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hi,  
I’m creating a custom form\_builder and  
i’m trying to figure out how would helpers like text\_field know if  
the field has an error message so I can highlight it and show the  
message text

thanks  
linoj

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<div class="post-metadata">

**Author:** ![linojon](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/b3f665/32.png) [@linojon](https://www.ruby-forum.com/u/linojon)\
**Post date:** [October 11, 2007, 3:47pm UTC](https://www.ruby-forum.com/t/form-builder/116881/2 "2007-10-11T15:47:28Z")

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Use something like:

unless your\_model\_instance.errors[:field\_name].nil?

# do whatever you need to handle an error

end