Re: (Beginner) Finding a database object within a time interval

Colin Law
Sun, 08 May 2011 13:07:37 -0000

On 8 May 2011 13:58, Anders_P
<anders-TlBSdMGKk75YFVMCzM9+FrNAH6kLmebB@public.gmane.org>
wrote:
> Hello,
>
> I''m trying to create a find statement that should find an element
> which start_date and end_date are within Time.now. If I for example
> have an object with a start_date of 2011-05-04 and end_date of
> 2011-05-19, the find statement should find the elment(s) that are
> within that time peroid. My code looks like this:
>
> def current_tee
>      @current_time = Time.now
>      @current_tee = Tee.find(:conditions => [
>        "id = ? AND featured => true AND start_date >
#{@current_time}
> AND end_date <= #{@current_time}", params[:id]

Did you mean to require id = params[:id]?  That means it can only ever
find the one with that id, and then only if its time fields fit.
Also note that this method would be better as a scope method of the
Tee model, though that is not the cause of the error.

>      ])
> end
>
> And:
>
> def show
>    @tee = current_tee
>    respond_to do |format|
>      format.html # show.html.erb
>      format.xml  { render :xml => @tee }
>    end
> end
>
> I keep getting this error: Couldn''t find Tee without an ID.

Have you checked that params[:id] actually contains a value?  Have a
look in development.log to see what params are being passed in.  Also
have a look at the Rails Guide on debugging and find out how to use
ruby-debug to break into your code and examine data and follow flow.
It is an invaluable technique when you cannot work out what is going
on.

Colin