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How to access a backing field in a base class?

Original Post

atp0303

25 May, 2010 04:02 PM via web

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I would like to access a backing field which is defined in a base class:

 public class Article : Content
 {
       public string Body {get; set;} 
 }

 public class Content
 { 
       private IList _photos; 
       public Content() 
       {
            _photos = new List<Photo>();
       }   

       public virtual IEnumerable Photos 
       {
          get {  return _photos;  }
       }  

       public virtual void AddPhoto() {...} 
}

My mapping class is something like:

  public ArticleMap()
  {  
      Id(x => x.Id);
      Map(x => x.Body);                        
      HasMany(x => x.Photos)
        .Access.CamelCaseField(Prefix.Underscore)
        .Cascade.All();
  }

I constantly get the error that the _photos field cannot be found. Even marking the _photos field as public does not work.

How can i tell the configuration to "look" in the base class to find _photos?

1. 2 Posted by Devon Lazarus on 27 May, 2010 03:15 PM

   

   _photos is marked as a private variable in the base class so it is not accessible from the subclass. Try accessing base._photos directly in your Article class and you'll see what I mean.

   You need to map the base class, then turn ArticleMap into a SubclassMap<Article>. Something like this:

   public ContentMap : ClassMap<Content> {
       HasMany(x => x.Photos)
           .Access.CamelCaseField(Prefix.Underscore)
           .Cascade.All();
   }
   
   public ArticleMap : SubclassMap<Article> {
       Id(x => x.Id);
       Map(x => x.Body);
   }
   

   This could be different depending on whether you're implementing Table-per-class-hierarchy or Table-per-subclass.

   hth,

   -devon

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