Ruby on Rails

What I'm trying to do is parse out the title and then save it to the DB for quick display on the webpage.

I could do a before_save, hadn't thought of that, but would I have the same issues? I'm basically doing a Page.new(...), a few lines of validation, and then Page.save() so before_save would be ok I guess.  Is there typically a standard way of doing things?

On Fri, Dec 21, 2012 at 4:36 PM, Norbert Melzer <timmelzer@gmail.com> wrote:

I would use a before_save or what it is called if I were you.

Am 21.12.2012 19:40 schrieb "Walter Lee Davis" <waltd@wdstudio.com>:

On Dec 21, 2012, at 1:12 PM, Dan Brooking wrote:

> So is the way I'm doing it right?  Or just a way I happened to hack it to work?
>
> The way my code was looking was basically:
>
> Page.new(:url => 'http://www.yahoo.com')
>
> class Page < ActiveRecord::Base
>   attr_accessible :url, :title
>
>   after_initialize :parse_page_params
>
>   def parse_page_params
>     @title = "test"
>   end
>

Have a look at the documentation for after_initialize -- it runs once, after Rails itself is fully initialized. Is that the point at which you mean to instantiate the instance variable @title? Which instance of its class would it attach to? Can you please describe what you intend to do with @title -- where it's going to be used?

Walter

> and this wasn't working...  I understand what you said above about the instance variables, methods, initializing, etc.. but still a little unclear about why that code doesn't work as I'm setting it.  Is it because Rails uses the method name of title which hasn't been initailized in my assignment above?
>
>
>
>
> On Fri, Dec 21, 2012 at 12:43 PM, Walter Lee Davis <waltd@wdstudio.com> wrote:
>
> On Dec 21, 2012, at 12:37 PM, Dan Brooking wrote:
>
> > I posted a previous message about overriding initialize... because I was having issues setting some of the parameters.  I have a Page model that has:
> >
> > attr_accessible :url, :title, :doc, :domain
> >
> > and it's called via:
> >
> > Page.new(:url => 'http://www.yahoo.com')
> >
> > Since I'm only passing in the url to new, I needed to set the other parameters.  I was trying to do this via an after_initialize callback which wasn't working so tried overriding initialize... still not working.
> >
> > What I found out was that in my after_initialize, I was referring to title as @title which is why it was not working.  I switched it to self.title and it works fine.
> >
> > My question is - why?
>
> @title is an instance variable. Until you set it, it doesn't exist. Having a method on the model called title (or an accessor, or some other Rails magick) does not instantiate that method's return until and unless you ask for it by calling the method. Calling self.method_name just makes it clear which same-named method you really mean. Self is implied much of the time, but when you have all the many method_missing options available, it might not be the first one such that gets called.
>
> Walter
>
> >
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