[Rails] Child record becomes orphan

[Robby Russell]

On Sun, 2006-01-01 at 19:52 +0100, Gerard wrote:
> Hi all,
> 
> I've got these company (has) contacts relational tables. I want to make sure a 
> company can't be deleted when it still has contacts. (because I can now, 
> which results in nil like errors when listing the contacts ... obviously)
> 
> Are there any helpers to do so, is Rails aware of this? Or do I need to put in 
> a condition before destroying the company record in question myself?
> 
>   def destroy_company
>    # Haven't figured out the syntax yet so don't laugh about the line below.
>    if Contact.find_all(params[:company_id]) == Company.find(params[:id]) <<<
>       flash[:notice] = 'This company has contacts.'
>       redirect_to :action => 'show_company', :id => @company.id
>     else    
>       Company.find(params[:id]).destroy
>       redirect_to :action => 'list_companies'
>     end
>   end
> 
> Thanx Regards,
> 
> Gerard.
> 

Do you intend to force the user to delete all contacts in a company
prior to deleting it? You can have AR destroy all the contacts when a
company is destroyed. See this blog entry:

http://rubyurl.com/bE4

-Robby


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