# REST error

**URL:** <https://www.ruby-forum.com/t/rest-error/144697>\
**Category:** Rails\
**Created:** [August 1, 2008, 10:11am UTC](https://www.ruby-forum.com/t/rest-error/144697 "2008-08-01T10:11:37Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![srijith](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/c77e96/32.png) [@srijith](https://www.ruby-forum.com/u/srijith)\
**Post date:** [August 1, 2008, 10:11am UTC](https://www.ruby-forum.com/t/rest-error/144697/1 "2008-08-01T10:11:37Z")

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Hi i given in routes.rb as

map.resources :students, :member =\> [:departments =\> :get]

and rhtml i given link

```
<td><%=link_to "Departments", departments_student_url(student)

```

%\>

in students controller

def departments  
@student= Student.find params[:id]

# @departments = @student.departments

end

when i click the departments link it showing error like

undefined method `departments\_student\_url’ for  
#ActionView::Base:0xb73d2f18

what’s a problem?

please sujjest any good link to study RESTful architecture in detail and  
also in depth?

with regards  
babu nair

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<div class="post-metadata">

**Author:** ![srijith](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/c77e96/32.png) [@srijith](https://www.ruby-forum.com/u/srijith)\
**Post date:** [August 1, 2008, 10:39am UTC](https://www.ruby-forum.com/t/rest-error/144697/2 "2008-08-01T10:39:00Z")

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try department\_student\_url(studen)

On Fri, Aug 1, 2008 at 1:41 PM, babu nair

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<div class="post-metadata">

**Author:** ![srijith](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/c77e96/32.png) [@srijith](https://www.ruby-forum.com/u/srijith)\
**Post date:** [August 1, 2008, 12:30pm UTC](https://www.ruby-forum.com/t/rest-error/144697/3 "2008-08-01T12:30:55Z")

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Sounds like it should be a nested resource, not it’s own action.