Rails undefined method count

Question

I am trying to check that an address isn't being used before I delete it. My code is as follows:

def destroy
        @address = current_user.addresses.find_by_id(params[:id])
        redirect_to user_addresses_path(current_user) if @address.nil?

        if Organisation.find_by_address_id(params[:id]).count == 0 && Event.find_by_address_id(params[:id]).count == 0
            @address.destroy
            redirect_to user_addresses_path(current_user)
        else
            flash[:error] = "Cannot delete address because it is being used"
            redirect_to user_addresses_path(current_user)
        end
    end

however, this gives me an error:

undefined method `count' for nil:NilClass

What am I doing wrong?

address_id is an index on both tables, if that is of any relevance. — Ashley Bye
– Ashley Bye, Commented May 11, 2012 at 21:27
Please only tag your questions with language tags please. This is so we can keep tagspam on Stack Overflow to a minimum. Thanks. — Ryan Bigg
– Ryan Bigg, Commented May 11, 2012 at 21:34
Sorry, I thought they were relevant to my query. Lesson learnt. — Ashley Bye
– Ashley Bye, Commented May 12, 2012 at 6:38

Ryan Bigg · Accepted Answer · 2012-05-11 21:33:38Z

2

Organisation.find_by_address_id(params[:id]) will return a single object, or nil if one without that address_id does not exist.

Perhaps you meant Organisation.find_all_by_address_id(params[:id]).

answered May 11, 2012 at 21:33

Ryan Bigg

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