[baseten-users] to-many relationship defined but not seen, bug?

[Jianhua Meng]

Hi List,

I don't know if this is a bug in the baseten framework or a bug on my  
part. For some reason I could not figure out, a to-many relationship  
in our app does not appear to be available when it is clearly defined  
in the model along with many other similar relationships.

We have, in the model of interest, InsuranceCompany --(x)-->>  
InsurancePlan --(y)-->> InsurancePolicy, where x and y are both to- 
many relationships. x works fine and y does not. When y is accessed,  
it triggers the following error:

BXDatabaseObject.m:540  -[BXDatabaseObject primitiveValueForKey:]  
[0x40d640m] 	  ERROR: Key insurancePolicies wasn't found in entity <pgsql://Wuxing.local.:5432/quickceph InsurancePlan (0x159663a0) validated: 1 enabled: 1 
 >. (Called from an instance of QCXInsurancePlan.)
2009-04-11 11:28:43.996 QuickCephOffice[23939:813] [<QCXInsurancePlan  
0x159d25f0> valueForUndefinedKey:]: this class is not key value coding- 
compliant for the key insurancePolicies.

Here's the section of the model that shows how the relationship  
(insurancePolicies) is setup. Does anyone see anything wrong?


Any insights you have on the likely cause of this problem will be  
greatly appreciated.

Here's the custom code we have the complaining class, QCXInsurancePlan

#import "QCXManagedObject.h"

@class QCXInsuranceCompany;
@class QCXInsurancePolicy;

@interface QCXInsurancePlan :  QCXManagedObject
{
}

// attributes omitted to simplify the illustration
...

// relationships
@property (retain) QCXInsuranceCompany * insuranceCompany;
@property (retain) NSSet* insurancePolicies;

@end

@interface QCXInsurancePlan (RelationshipManagement)
- (void)addInsurancePoliciesObject:(QCXInsurancePolicy *)value;
- (void)removeInsurancePoliciesObject:(QCXInsurancePolicy *)value;
@end

 From our point of view, the QCXInsurancePlan.insurancePolicies  
appears to be defined properly in the model and in our code. What then  
can explain for the error message? How should I go about debugging  
this? I poked around the entity descriptions of QCXInsurancePlan, and  
could not figure out how to interpret the results. I expected to see  
all the relationships to be described there or somewhere, but I could  
not find explicit evidence.

How does an entity report a to-many relationship? How do I know if a  
to-many relationship is defined according to the underlying  
BXEntityDescription? I don't see an explicit entry for  
'insurancePolicies' in the reported results. But on the other hand, I  
don't see the expected 'insurancePlans' in InsuranceCompany's  
relationshipsByName report either. The latter is known to work as  
expected.
(gdb) po [entity relationshipsByName]  // where entity is extracted  
from an instance of QCXInsurancePlan
{
     InsuranceCompany = <BXRelationshipDescription (0x165684d0) name:  
InsuranceCompany entity: InsurancePlan destinationEntity:  
InsuranceCompany>;
     InsurancePolicy = <BXRelationshipDescription (0x16568350) name:  
InsurancePolicy entity: InsurancePlan destinationEntity:  
InsurancePolicy>;
     "PracticeManagement_InsurancePolicy_insurancePlan" =  
<BXRelationshipDescription (0x16568010) name:  
PracticeManagement_InsurancePolicy_insurancePlan entity: InsurancePlan  
destinationEntity: InsurancePolicy>;
     insuranceCompany = <BXRelationshipDescription (0x16568400) name:  
insuranceCompany entity: InsurancePlan destinationEntity:  
InsuranceCompany>;
}

For comparison, InsuranceCompany contains a similar to-many  
relationship. Since QCXInsuranceCompany.insurancePlans works as  
expected, how come I don't see insurancePlans reported here explicitly  
either?
(gdb) po [[company entity] relationshipsByName] // where company is an  
instance of QCXInsuranceCompany
{
     AdjustedFee = <BXRelationshipDescription (0x1658b0f0) name:  
AdjustedFee entity: InsuranceCompany destinationEntity: AdjustedFee>;
     InsurancePlan = <BXRelationshipDescription (0x1658af30) name:  
InsurancePlan entity: InsuranceCompany destinationEntity:  
InsurancePlan>;
     "PracticeManagement_AdjustedFee_insuranceCompany" =  
<BXRelationshipDescription (0x1658b020) name:  
PracticeManagement_AdjustedFee_insuranceCompany entity:  
InsuranceCompany destinationEntity: AdjustedFee>;
     "PracticeManagement_InsurancePlan_insuranceCompany" =  
<BXRelationshipDescription (0x1658ae80) name:  
PracticeManagement_InsurancePlan_insuranceCompany entity:  
InsuranceCompany destinationEntity: InsurancePlan>;
}


I don't get the whole picture. Thanks for any help.

Jianhua Meng



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