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POCore data insert and fetch to-many relationship entities
 

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    <p>I am new to core data therefore I have got few questions. I'll ask two</p> <p>1) I have two entities named Team and TeamMembers. They have to-many relationship i.e. one team can have many members. First please take a look at following diagram and .h files of there models and let me know whether I have made correct to-many relationship between Team and TeamMembers (I have a feeling that I have made opposite relationship).</p> <p><img src="https://i.stack.imgur.com/f3z4O.png" alt="enter image description here"></p> <p>Teams.h</p> <pre><code>#import &lt;CoreData/CoreData.h&gt; @class TeamMembers; @interface Teams : NSManagedObject { } @property (nonatomic, retain) NSString * team_name; @property (nonatomic, retain) NSString * color; @property (nonatomic, retain) NSString * points; @property (nonatomic, retain) TeamMembers * members; @end </code></pre> <p>TeamMembers.h</p> <pre><code>#import &lt;CoreData/CoreData.h&gt; @class Teams; @interface TeamMembers : NSManagedObject { } @property (nonatomic, retain) NSString * member_name; @property (nonatomic, retain) NSSet* teams; @end @interface TeamMembers (CoreDataGeneratedAccessors) - (void)addTeamsObject:(Teams *)value; - (void)removeTeamsObject:(Teams *)value; - (void)addTeams:(NSSet *)value; - (void)removeTeams:(NSSet *)value; @end </code></pre> <p>2) Please I need sample code for inserting Team then inserting its team members. Also How to fetch team members of particular team.</p> <hr> <p><strong>EDITED</strong> I am using following piece of code to insert into Teams and Team members entities but it is not returning all team members in NSSet. It is returning only one team member in the result set</p> <pre><code> self.context = [del managedObjectContext]; Teams *teamobj = [NSEntityDescription insertNewObjectForEntityForName:@"Teams" inManagedObjectContext:context]; teamobj.team_name = teamname.text; teamobj.color = [NSString stringWithFormat:@"%d", color]; teamobj.points = [NSString stringWithFormat:@"%d", 0]; for(UITextField *view in self.scrollview.subviews) { if([view isKindOfClass:[UITextField class]]) { if ([view tag] == 99) { if (![view.text isEqualToString:@""]) { noone = YES; TeamMembers *teammember = [NSEntityDescription insertNewObjectForEntityForName:@"TeamMembers" inManagedObjectContext:context]; teammember.member_name = view.text; teammember.teams = teamobj; [teamobj addMembersObject:teammember]; } } } } if (![context save:&amp;error]) { NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]); UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Failure" message:@"Unable to save team at the moment." delegate:self cancelButtonTitle:@"ok" otherButtonTitles:nil]; [alert show]; [alert release]; } </code></pre>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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