# Cancellare un record da una join table

**URL:** <https://www.ruby-forum.com/t/cancellare-un-record-da-una-join-table/195319>\
**Category:** IT\
**Created:** [September 21, 2010, 5:59pm UTC](https://www.ruby-forum.com/t/cancellare-un-record-da-una-join-table/195319 "2010-09-21T17:59:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![punkaruby](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/49beb7/32.png) [@punkaruby](https://www.ruby-forum.com/u/punkaruby)\
**Post date:** [September 21, 2010, 5:59pm UTC](https://www.ruby-forum.com/t/cancellare-un-record-da-una-join-table/195319/1 "2010-09-21T17:59:46Z")

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Ciao,  
devo cancellare un record da una join table (courses\_teachers) vale a  
dire che devo cancellare l’abbinamento di un docente in un corso (non  
devo cancellare il docente).

ho creato il seguente metodo nel controller courses:

def deleteTeach  
@course = Course.find(session[:id\_corso])  
@teacher = Teacher.find(params[:id])  
@course.teachers.delete(@teacher)  
end

nella view (lo show del corso) ho messo le seguenti istruzioni:

\<%= link\_to image\_tag(“delete.gif”, :border=\>0), :confirm =\> ‘Sicuri ?’,  
:method =\> :deleteTeach %\>

Ma quando clicco… Rails mi ride in faccia…

☹

non succede niente…

Apprezzati suggerimenti…

(“cambia mestiere” non è un suggerimento che nel contingente mi aiuta a  
risolvere il problema…)

:°-(

Grazie a todos

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<div class="post-metadata">

**Author:** ![punkaruby](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/49beb7/32.png) [@punkaruby](https://www.ruby-forum.com/u/punkaruby)\
**Post date:** [September 22, 2010, 12:13pm UTC](https://www.ruby-forum.com/t/cancellare-un-record-da-una-join-table/195319/2 "2010-09-22T12:13:31Z")

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Ti incollo le api 🙂

Delete an object (or multiple objects) where the id given matches the  
primary\_key. A SQL DELETE command is executed on the database which  
means that no callbacks are fired off running this. This is an efficient  
method of deleting records that don‘t need cleaning up after or other  
actions to be taken.  
Objects are not instantiated with this method.  
Attributes

id - Can be either an Integer or an Array of Integers.  
Examples

# Delete a single object

Todo.delete(1)

# Delete multiple objects

todos = [1,2,3]  
Todo.delete(todos)

se vuoi cancellare Teacher dovresti fare:  
Teacher.delete(params[:id])

An Car wrote:

> ```
> @course = Course.find(session[:id_corso])
> @teacher = Teacher.find(params[:id])
> @course.teachers.delete(@teacher)
> 
> ```