All versions (including the latest) would belong to the versions collection:
[HasMany]
public IList<DocumentVersion> Versions {get;set;}
so, you might have something like this as a method on your Document class:
public virtual DocumentVersion NewVersion()
{
DocumentVersion newVersion = new DocumentVersion
{
Document = this;
VersionNumber = LatestVersion.VersionNumber + 1;
}
LatestVersion = newVersion;
Versions.Add(newVersion);
return newVersion;
}
Then when updating the document you do something along the lines of:
var newVersion = document.NewVersion();
newVersion.XXXX = value;
document.Save(); // or Repository<Document>.Update(document) etc.
Make sense?
Cheers,
- Alex
On Mon, Mar 22, 2010 at 10:10 PM, chitech <[email protected]> wrote:
> Alo Markus
>
> I have a question about the solution with 2 table. How do you keep
> track of the DocumentVersion chain when you only save the
> LatestVersion?
>
> On Mar 20, 7:22 pm, Markus Zywitza <[email protected]> wrote:
> > You are using the wrong model. I have solved a similar problem by using
> >
> > [ActiveRecord]
> > public class Document
> > {
> > [HasMany]
> > public IList<DocumentVersion> Versions {get;set;}
> >
> > [BelongsTo]
> > public DocumentVersion LatestVersion {get;set;}
> >
> > public DocumentVersion CreateNewVersion()
> > {
> > // logic for creating new DocumentVersion
> > // also updates LatestVersion and Versions list
> > }
> >
> > }
> >
> > [ActiveRecord]
> > public class DocumentVersion
> > {
> > [BelongsTo]
> > public Document Document {get;set;}
> >
> > }
> >
> > If you really have to use one class only, try this:
> >
> > [ActiveRecord]
> > public class Document
> > {
> > [BelongsTo]
> > public Document Parent {get;set;}
> >
> > [BelongsTo]
> > public Document OriginalVersion {get;set;}
> >
> > [BelongsTo]
> > public Document LatestVersion {get;set;}
> >
> > public Document CreateNewVersion()
> > {
> > // logic for creating new Document version
> > // also updates LatestVersion on all ancestors
> > }
> >
> > }
> >
> > -Markus
> >
> > 2010/3/18 chitech <[email protected]>:
> >
> >
> >
> > > Alo
> >
> > > I have a document object which can have one parent document and one
> > > child document. A chain like this:
> >
> > > first version document (no parent, one child) - second version
> > > document (one parent, one child) - third version document (one parent,
> > > no child)
> >
> > > I have this mapping:
> >
> > > [ActiveRecord(Lazy = true)]
> > > public class Registration
> > > {
> > > [BelongsTo("ParentDocumentId")]
> > > public virtual Document ParentDocument { get; set; }
> >
> > > [HasMany]
> > > public virtual IList<Document> ChildDocuments { get; set; }
> >
> > > public virtual Document ChildDocument
> > > {
> > > get
> > > {
> > > return ChildDocuments != null && ChildDocuments.Count
> > > == 1 ? ChildDocuments[0] : null;
> > > }
> > > set
> > > {
> > > if (ChildDocuments == null) ChildDocuments = new
> > > List<Document>();
> > > ChildDocuments.Add(value);
> > > }
> > > }
> > > }
> >
> > > How can I make a query to get the last Document (third version
> > > document). I can't really figure out how to use HQL or criteria to
> > > solve this problem.
> >
> > > Thx in advance
> >
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