# Check if error\_messages\_for is set **URL:** \ **Category:** Rails\ **Created:** [August 17, 2009, 8:31pm UTC](https://www.ruby-forum.com/t/check-if-error-messages-for-is-set/173892 "2009-08-17T20:31:22Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 8:31pm UTC](https://www.ruby-forum.com/t/check-if-error-messages-for-is-set/173892/1 "2009-08-17T20:31:22Z")
How do I check if error\_messages\_for is set? ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 9:28pm UTC](https://www.ruby-forum.com/t/check-if-error-messages-for-is-set/173892/2 "2009-08-17T21:28:57Z")
On Aug 17, 7:31 pm, Pål Bergström [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > How do I check if error\_messages\_for is set? error\_messages\_for is a method, I assume what you meant to ask was how to check whether there are any errors. You can either call valid? or look at your\_ar\_object.errors Fred ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 10:04pm UTC](https://www.ruby-forum.com/t/check-if-error-messages-for-is-set/173892/3 "2009-08-17T22:04:00Z")
Frederick C. wrote: Hmm. Ok. How do I check if a params part of the model is set? If run: if params[:kind] it’s ok. But when I test with if params[:company][:kind] it returns “The error occurred while evaluating nil.[]” ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 10:13pm UTC](https://www.ruby-forum.com/t/check-if-error-messages-for-is-set/173892/4 "2009-08-17T22:13:27Z")
On Aug 17, 9:04 pm, Pål Bergström [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Frederick C. wrote: > > Hmm. Ok. How do I check if a params part of the model is set? If run: > > if params[:kind] That doesn’t check the model at all, you’re just looking at the submitted parameters. Or am I misunderstanding the question > it’s ok. But when I test with > > if params[:company][:kind] > > it returns “The error occurred while evaluating nil.[]” if the parameters may or may not be there you need to check whether params[:company] exists before you can look at params[:company][:kind] Fred ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 10:11pm UTC](https://www.ruby-forum.com/t/check-if-error-messages-for-is-set/173892/5 "2009-08-17T22:11:41Z")
2009/8/17 PÃ¥l Bergström [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > Hmm. Ok. How do I check if a params part of the model is set? If run: > > if params[:kind] > > it’s ok. But when I test with > > if params[:company][:kind] > > it returns “The error occurred while evaluating nil.[]” Look at the error carefully, if it is finding nil.[] then maybe either params is nil (unlikely unless you typed it incorrectly) or params[:company] is nil. Look in the log file (in your application log folder) it will show you the parameters posted. Colin ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 10:26pm UTC](https://www.ruby-forum.com/t/check-if-error-messages-for-is-set/173892/6 "2009-08-17T22:26:03Z")
PÃ¥l Bergström wrote: What a long way for a simple answer, that I knew before. Why on earth check error\_messages\_for when I have params[my\_model] 🙂 Thanks for the help. ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 10:20pm UTC](https://www.ruby-forum.com/t/check-if-error-messages-for-is-set/173892/7 "2009-08-17T22:20:43Z")
Frederick C. wrote: > On Aug 17, 9:04�pm, P�l Bergstr�m [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > wrote: > That doesn’t check the model at all, you’re just looking at the > submitted parameters. Or am I misunderstanding the question It’s a submitted parameters. 🙂 > if the parameters may or may not be there you need to check whether > params[:company] exists before you can look at params[:company][:kind] Thanks. That might be it.