Re: help with a relationship...
Re: help with a relationship...
- Subject: Re: help with a relationship...
- From: Chuck Hill <email@hidden>
- Date: Wed, 6 May 2009 11:47:06 -0700
On May 6, 2009, at 11:04 AM, Theodore Petrosky wrote:
the problem is that:
I hope that above all, the tone that I want to express is one of
gratitude and awe that you guys have this knowledge at your finger
tips, and are willing to share it.
1. I am inexperienced
2. I feel that I work in a Vacuum and being inexperienced I think I
am heading to perdition (or at least feeling alone)
3. At times I hesitate to ask because the answers are sometime over
my head...
4. as for the naming..... I need to learn a lot.... and this project
has morphed from a simple contact manager to a lot more.
BTW what would you have called the contactEO?
contactEO = ERXEC.newEditingContext();
It is not a Contact and and it not an EO (EOEntrepriseObject).
Calling it octopusHair would be no less misleading. :-) It is a new
editing context, so I would call it something like
ec
editingContext
newEC
newEditingContext
Chuck
John's answer below is the exception.... I still don't understand
WHY this works, but at least I can continue and hopefully learn a
little.
Being a beginner, the instructions "look for the small diamond in
Entity Modeler" made the difference....
+++++
Make sure that SubCategoryID isn't a class property (that there is not
a small diamond next to it in Entity Modeler).
John
++++++
--- On Wed, 5/6/09, Chuck Hill <email@hidden> wrote:
From: Chuck Hill <email@hidden>
Subject: Re: help with a relationship...
To: "Theodore Petrosky" <email@hidden>
Cc: email@hidden
Date: Wednesday, May 6, 2009, 1:42 PM
On May 6, 2009, at 10:38 AM, Theodore Petrosky wrote:
I initialize contactEO in the constructor like this.
contactEO = ERXEC.newEditingContext();
It will be a LOT less confusing in the future if you give
it a name
closer to what it actually is....
Ted
--- On Wed, 5/6/09, Chuck Hill <email@hidden>
wrote:
From: Chuck Hill <email@hidden>
Subject: Re: help with a relationship...
To: "Theodore Petrosky" <email@hidden>
Cc: email@hidden
Date: Wednesday, May 6, 2009, 12:47 PM
On May 6, 2009, at 8:08 AM, Theodore Petrosky
wrote:
I have an object -- Contact -- the has a
relationship
to a Category.
each contact one category. when I create a
new
contact, I read the categories from the backend
and apply
the first (zeroth) category (my generic category)
public void
createNewContact() {
NSLog.out.appendln("top of createNewContact
+++++++++++++++++++++++++++++");
newContact = new
Contact();
Unrelated, but that line above is not needed with
the next
line:
newContact =
(Contact)EOUtilities.createAndInsertInstance(contactEO,
"Contact");
contactEO is an EditingContext, not an EO, right?
newContact.setContactCategory(contactCategoryList.objectAtIndex(0));
NSLog.out.appendln("newContact.setSubCategory+++ =
" +
newContact.subCategory());
newContact.setUser(repList.objectAtIndex(0));
}
This works beautifully. I get a new contact.
If I
actually type something in the contact name field
and
saveChanges() to the EO everything is
happy.
well they want to add subCategories. I create
the
entity and have a relationship between subCategory
and
Contacts as well as subCategory and Category.
each contact one subCategory
each Category one subCategory
but obviously each Category many subCategories
(same
for Contacts).
I can not seem to get the relation to work
with the
subCategory... I need to create a new contact so I
add a
line to the createNewContact:
newContact.setSubCategory(subCategoryList.objectAtIndex(0));
obviously subCategoryList is an array of
subCategories
that I read in exactly the same as the
categoryList.
so when I try to save the EO I get an error:
- ValidationException e = Please provide a
<b>Sub CategoryID</b>.
So I added some NSLogs around the
saveChanges() and I
see:
NSLog.out.appendln("inside try
newContact.subCategory+++ = " +
newContact.subCategory());
contactEO.saveChanges();
if I read this correctly, the newContact has
a
subCategory with a primary key "1", but I still
get this:
- ValidationException e = Please provide a
<b>Sub CategoryID</b>.
I am at a loss.... I have added so many NSLogs
to try
to see the flow and it 'should' work... (I think)
but I hate
shoulding on myself....
Ted
--
Chuck Hill Senior Consultant / VP Development
Come to WOWODC'09 in San Fran this June!
http://www.wocommunity.org/wowodc09/
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