0.10.1中RestKit对象映射的问题

作为solved issue with the object mapping的以下问题，我已将RestKit升级到0.10.1，并将数据模型扩展到以下内容。0.10.1中RestKit对象映射的问题

一个公司可以有多个联系人和活动，一个接触可以有多个活动，但只有一家公司，一个活动只能有一个公司和一个接触。

实体关系

Company 
- unitID 
- companyID 
- matchcode 
- contacts* (Company -->> Contact | 1:n) 
- activities* (Company -->> Activity | 1:n) 

Contact 
- unitID 
- companyID 
- contactID 
- lastName 
- firstName 
- company* (Contact >--> Company | 1:1) 
- activities* (Contact -->> Activity | 1:n) 

Activity 
- unitID 
- activityID 
- companyID 
- contactID 
- subject 
- account* (Activity >--> Company | 1:1) 
- contact* (Activity >--> Contact | 1:1)

JSON（公司）

[ 
    { 
     "unitID":"003CABD8DEB5DC13C", 
     "companyID":"BSP-002999", 
     "matchcode":"Testcompany" 
    } 
]

JSON（联系）

[ 
    { 
     "unitID":"DAC2ACCC125795D00", 
     "companyID":"BSP-002999", 
     "contactID":"CLP-015468", 
     "firstName":"Mister", 
     "lastName":"Wayne" 
    } 
]

JSON（活动）

[ 
    { 
     "unitID":"E123FlADAS2DASD2F", 
     "activityID":"ACT-123912", 
     "companyID":"BSP-002999", 
     "contactID":"CLP-015468", 
     "subject":"Testsubject", 
    } 
]

对象映射 - 建立的连接

// Objects 
companyMapping.primaryKeyAttribute = @"companyID"; 
... 
contactMapping.primaryKeyAttribute = @"contactID"; 
... 
activityMapping.primaryKeyAttribute = @"activityID"; 

// Connections 
[contactMapping mapRelationship:@"company" withMapping:companyMapping]; 
[contactMapping connectRelationship:@"company" withObjectForPrimaryKeyAttribute:@"companyID"]; 

[activityMapping mapRelationship:@"company" withMapping:companyMapping]; 
[activityMapping connectRelationship:@"company" withObjectForPrimaryKeyAttribute:@"companyID"]; 

[activityMapping mapRelationship:@"contact" withMapping:contactMapping]; 
[activityMapping connectRelationship:@"contact" withObjectForPrimaryKeyAttribute:@"contactID"];

问题

前两个映射操作工作像他们应该，但不知最后一次映射活动> - >联系人不起作用。

No connection for contact