Core Data

I've been exploring Core Data this morning. There's a great set of videos that make up a tutorial to build the project shown above. The only code in the whole thing is down at #13. Here is my cheat sheet (it's handy for debugging the result).

1. Create New Project => Core Data Doc App and call it CheckIn. 2. Model data. Open MyDocument.xcdatamodel Two entities: VersionRelease, CommitMessage 3. VersionRelease has 1 attribute: name: string default = untitled and 1 relationship commitMessages: destination CommitMessage To-Many Delete Rule = Cascade 4. CommitMessage has 3 attributes: message: string default = new commit message creationDate: Date isCommitted: boolean default = NO and 1 relationship versionRelease: destination VersionRelease Inverse = commitMessages 5. User Interface. Open MyDocument.nib NSTableView with 1 column titled Releases Two Buttons 25 x 23 6. NSArrayController called ReleasesController manages entity VersionRelease Bind managedObjectContext to File's Owner managedObjectContext Bind Table Column value to ReleasesController arrangedObjects w/path = name Set Buttons target-action to ReleasesController add and remove 7. Test 8. Another TV with 1 column titled Commit Messages Below that a text field, a date picker and a checkbox called is Committed Two Buttons 9. NSArrayController called MessagesController manages entity CommitMessage Bind managedObjectContext to File's Owner managedObjectContext Bind contentSet to ReleasesController selection w/ path = commitMessages Bind Table Column value to MessagesController arrangedObjects w/path = message Bind TextField value to MessagesController selection w/path = message (contrary to audio, not the "same thing") Bind DatePicker to MessagesController selection w/path = creationDate Bind CheckBox to MessagesController selection w/path = isCommitted Set Buttons target-action to MessagesController add and remove 10. Test 11. Enhancements TimeStamp 12. Open MyDocument.xcdatamodel Change CommitMessage Class (top left) to CommitMessageMO 13. new File Objective-C class CommitMessageMO.m In .h change NSObject to NSManagedObject In .c add method: - (void)awakeFromInsert { [self setValue:[NSDate date] forKey:@"creationDate"]; } 14. SearchBox in MyDocument.nib put in a searchField Bind Predicate to MessagesController Customize predicate format (case-insensitive): message contains[c] $value