Is what you are describing similar to the "To Dos" example at: http://homepage.mac.com/mmalc/CocoaExamples/controllers.html
Adam On Thu, Mar 27, 2008 at 5:33 AM, Ian Jackson <[EMAIL PROTECTED]> wrote: > If I may be so bold, I'd like to jump in on this question. I have a > similar situation, but I want to have a table representing a to-many > relationship for entity1, which the user can populate by choosing any > number of entries from a entity2. > > e.g. entity2 has 50 entries. > > entity1 1st entry refers to entries 1, 4, and 9 of entity 2. > entity1 2nd entry refers to entries 4, 8 and 26 of entity 2. > > So I envisage that the table in entity1 should have add and remove > buttons. When you click add, a new row is added to the table. The > first column in the table is a NSCombobox, which can be used to select > from the entries in entity 2. > > The employee/department tutorial seems to come close to doing this, > but as seems to be more the norm, it assumes that all entries in the > relationship are wanted, which is not the case here. > > So, I set up the interface as above (table with NSCombobox, and +/- > buttons). I created a special array controller just for this to-many > relationship, and bound its contentset to the relevant relationship in > entity1. > The first column in the table is bound to the specially created array > controller, arrangedObjects, but this is a dead end. I can't see how > to make the combobox choose the entry. The combo box doesn't have the > same binding options as a popup menu. > > Any advice as to how to approach this would be great. > > Ian. > > > > > On 27/03/2008, at 7:34 PM, Adam Gerson wrote: > > > I think that internally when you create a to-many core-data > > relationship the group of objects is stored as an NSSet as opposed to > > an array. > > > > > > > http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSSet_Class/Reference/Reference.html > > > > > http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaBindings/Concepts/CntrlContent.html#/ > > /apple_ref/doc/uid/TP40002147-181724 > > > > > http://developer.apple.com/documentation/Cocoa/Conceptual/KeyValueCoding/Concepts/AccessorConventions.html#/ > > /apple_ref/doc/uid/20002174-178830-BAJEDEFB > > > > > > On Thu, Mar 27, 2008 at 2:10 AM, Rick Mann <[EMAIL PROTECTED]> > > wrote: > >> > >> On Mar 26, 2008, at 11:06 PM, Adam Gerson wrote: > >>> Each table should have its own ArrayController if the two tables > >>> represent the data from two different entities. Since you entities > >>> are > >>> related I am assuming one entity has a property that is a to-many > >>> relationship to the other entity. Set the ContentSet bindings for > >>> ArrayController2 to be the selection of ArrayController1. > >>> > >>> ArrayController2 ContentSet > >>> Bind to = ArrayController1 > >>> Controller Key = selection > >>> Model Key Path = (the name of the relationship that represents > >>> entity2 > >>> in entity1) > >>> > >>> This will cause ArrayController2 to always populate the TableView > >>> with > >>> the objects selected by ArrayController1 > >>> > >>> Let me know if that needs to be more clear. > >> > >> > >> Excellent! That was exactly what was missing. Thank you. > >> > >> Why ContentSet, and not ContentArray or one of the other ContentXXX > >> things? > >> > >> -- > >> Rick > >> > >> > > > _______________________________________________ > > > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > > > Please do not post admin requests or moderator comments to the list. > > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > > > Help/Unsubscribe/Update your Subscription: > > http://lists.apple.com/mailman/options/cocoa-dev/bianface%40gmail.com > > > > This email sent to [EMAIL PROTECTED] > > > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/agersonl%40gmail.com > > This email sent to [EMAIL PROTECTED] > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
