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- NSString * strGroupId = [NSString stringWithFormat:@"%@_%@",CURRENT_USER_ID,[userDetailDict valueForKey:@"user_id"]];
- FIRDatabaseQuery * query1 = [[[_ref child:@"Message"] child:strGroupId]queryLimitedToLast:10];
- _refHandle = [query1 observeEventType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot *snapshot) {}];
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