Supported relationships

ActiveRecord currently supports the following relationships

• Has One
• Belongs To
• Has Many
• Has and Belongs to Many

In order to implement your own custom relationship you must create an ARRelationship subclass implementing these methods:

@interface ARRelationship : NSObject {
  NSString *name;
  NSString *className;
  ARBase *record;
}
@property(readwrite, retain) NSString *name, *className;
@property(readwrite, retain) ARBase *record;

+ (id)relationshipWithName:(NSString *)aName className:(NSString *)aClassName;

+ (id)relationshipWithName:(NSString *)aName;

- (id)initWithName:(NSString *)aName className:(NSString *)aClassName;
- (BOOL)respondsToKey:(NSString *)key supportsAdding:(BOOL *)supportsAddingRet;

- (BOOL)respondsToKey:(NSString *)key;

- (id)retrieveRecordForKey:(NSString *)key;

- (void)sendRecord:(id)record forKey:(NSString *)key;

- (void)addRecord:(id)record forKey:(NSString *)key;

- (void)removeRecord:(id)record forKey:(NSString *)key;

@end

addRecord: and removeRecord are similar to NSMutableArray’s addObject: and removeObject:atIndex: methods, they only need to be implemented for relationships that can have multiple records on either side of the relationship. Use repondsToKey:supportsAdding: to tell ARBase wether it supports adding for a certain key.

Keys are determined by putting the column name into lowercase and pluralizing or singularizing depending on the relationship (example: Has many would pluralize the objects owned but has one would not)