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I'm trying to map a simple data structure in nhibernate Tables: Employees employeeID int username varchar(30) departmentID int Departments departmentID int deptName varchar(50) My department mapping is like so: public class DepartmentMap: ClassMap<Department> { public DepartmentMap() { Id(m => m.DepartmentID).Column("departmentID"); Map(m => m.DepartmentName).Column("deptName").Length(50); HasMany(m => m.Employees); Table("Departments"); } } ... and the employee mapping public class EmployeeMap : ClassMap<Employee> { public EmployeeMap() { Id(x => x.EmployeeID, "employeeID"); Map(x => x.UserName, "username").Length(30); References<Department>(x => x.Department, "departmentID"); Table("Employees"); } } I'm trying to loop through departments and pull all employees from each department: foreach (var i in _directoryData.DepartmentCollection) { foreach (var e in i.Employees) { Debug.WriteLine(i.DepartmentName + " " + e.UserName); } } which gives me an error stating " Invalid column name 'Department_id'. " ... and in the generated query it uses department_id as well. When I just loop through departments and output the department name it works fine. Any idea what I'm missing to get the correct column name for departmentID? Here are my model objects just in case: public class Department { public virtual int DepartmentID { get; set; } public virtual string DepartmentName { get; set; } public virtual ICollection<Employee> Employees { get; set; } } public class Employee : PersistentEntity { public virtual int EmployeeID { get; set; } public virtual string UserName { get; set; } public virtual Department

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