NHibernate mapping index out of range

Question

I have two classes:

 public class CarModel
    {
        public virtual int Id { get; set; }
        public virtual string model_name { get; set; }
    }


        

Answer 1

The issue here is in a doubled column mapping:

<property name="model" />    
<many-to-one name="Modelis" column="model"  
     cascade="none" class="web_nt.Models.Class.CarModel" lazy="false" /> 

Both properties (valueType and Reference) are targeting same column. Which is possible but not for Write operations. We have to make one of them readonly using insert="false" and update="false"

<property name="model" insert="false" update="false" />    
<many-to-one name="Modelis" column="model"  
     cascade="none" class="web_nt.Models.Class.CarModel" lazy="false" /> 

So, now we do have access to both properties, mapped to same column, but the INSERT, UPDATE will target that column only once. Because that was the original issue here: ...ndex was out of range. Must be non-negative and less than the size of the collection...

Also check the similar issue: https://stackoverflow.com/a/24248912/1679310