Re: duplicating an EO
Re: duplicating an EO
- Subject: Re: duplicating an EO
- From: Chuck Hill <email@hidden>
- Date: Mon, 21 Mar 2011 11:33:02 -0700
On Mar 21, 2011, at 3:26 AM, David Avendasora wrote:
> Hi Ted,
>
> The link for PWO at Apress' site is: http://apress.com/book/view/9781590592960
>
> You can buy an eBook version of it there, which is spendy, but worth it to always have it at your fingertips. Chuck really wouldn't mind you buying it _3_ times... :-)
I regret that it makes no difference to me. Apress will be happy.
> There is also a link on that page to download the sourcecode related to the book. In there, in one of the chapters (I can't remember which one right now as I haven't bought the eBook =:-0 ) you'll find the source code for what you'd need in an EOCopyable interface and what methods you should add to your custom sublcass of EOGenericRecord.
>
> You do have a custom subclass of EOGenericRecord, right?!
>
> Good luck. The book is key to understanding what the source code is doing. Implementing Chuck's EOCopyable functionality will probably take you marginally longer than just manually doing the duplicating _this time_ but once you set it up, it's available on all EOs and it is _very_ cool.
>
> I'm amazed that this hasn't made its way into WOnder yet... well maybe people still need a reason to buy Chuck's book. I mean, with all the other really excellent WO books out there...
I think that Mike was going to at one point, then did not for some reason that I don't recall. I have some ideas to make it even cooler (make more decisions based on the model, use less code). If I do that, I'll will put it into Wonder.
Chuck
> On Mar 20, 2011, at 6:24 PM, Theodore Petrosky wrote:
>
>> 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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--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects
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