Re: duplicating an EO
Re: duplicating an EO
- Subject: Re: duplicating an EO
- From: Theodore Petrosky <email@hidden>
- Date: Sun, 20 Mar 2011 15:24:21 -0700 (PDT)
I have two copies of that book. I thought one at home and one in the office. I guess I have to wait till tomorrow at the office to read up.
thanks
Ted
--- On Sun, 3/20/11, David LeBer <email@hidden> wrote:
> From: David LeBer <email@hidden>
> Subject: Re: duplicating an EO
> To: "Theodore Petrosky" <email@hidden>
> Cc: email@hidden
> Date: Sunday, March 20, 2011, 5:39 PM
>
> On 2011-03-20, at 4:59 PM, Theodore Petrosky wrote:
>
> > I have a rather simple object. it has about 15
> attributes. My users have informed me that they need a way
> to insert 25 duplicates of this object. Obviously they go in
> and change the due date (or some other attribute) of the
> duplicates. this is the only change.
> >
> > so i gave them a simple popup with the numbers 1 to 25
> and they can choose how many of these things they want.
> >
> > what would be the easiest and bestest way to dup these
> objects. I started thinking to create a loop that iterates
> the number of times that they want and insert a new EO into
> the EC and copy the attributes from my master object.
> >
> > But maybe there is an easier way?
> >
> > I hope I am explaining it simply enough
>
>
> Practical WebObjects has a great chapter on EO copying.
>
> Unfortunately it is a subject that can eat an entire
> chapter. Duplicating only the attributes is easy, you can
> just ask the existing EO for it's entity, ask the entity for
> it's attributes, and then iterate through them calling
> setValueForKey on the new EO with valueForKey on the
> existing one. However when you get into relationships things
> become much more difficult to handle in a generic way (i.e:
> do you want to copy the destination EOs or just the
> relationships, do you want to copy the relationships of the
> destination EOs, etc).
>
> Anyway, the chapter in Chuck's book is well worth the
> read.
>
> ;david
>
> --
> David LeBer
> Codeferous Software
> 'co-def-er-ous' adj. Literally 'code-bearing'
> site: http://codeferous.com
> blog: http://davidleber.net
> profile: http://www.linkedin.com/in/davidleber
> twitter: http://twitter.com/rebeld
> --
> Toronto Area Cocoa / WebObjects developers group:
> http://tacow.org
>
>
>
>
>
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