I would say you wouldn't necessarily violate MVC if you pass the DynaActionForm as a DynaBean into your model. Your model doesn't need an "Form" functionality, it only needs to access the data which is supported by the DynaBean contract. DynaBean is not bound to any presentation layer and therefore does not couple your business tier to your web tier.
When passing data from my web tier to the business tier, I tend to convert the data contained in the form into data structures native to the business tier; Data Transport Objects (DTO) sometimes refered to as ValueObjects. I then pass around these DTOs. There has been plenty of discussion on this list and depending on which engineer you speak with you may get a different answer. For more information on this, search the archives. HTH, robert > -----Original Message----- > From: Vincent Stoessel [mailto:vincent@;xaymaca.com] > Sent: Tuesday, November 05, 2002 2:34 PM > To: Struts Users > Subject: Passing an (Dyna)ActionForm to the business object > > > I know I have probably violated MVC by doing this but > while trying to find an elegant solution to passing > field values between my Action classes and my Model Classes > I went ahead and passed the whole darn DyaActionForm (daf) > to my Model class: > > Why did I got to the dark side? It was so convenient to > only have to add/remove fields in one class (and in struts-config.xml). > I am working with a massive form that is in flux and editing 2 classes > all the time was slowing me down: > > // The Old way: the force > in myAction: > > DynaActionForm daf = (DynaActionForm) acForm ; > myModel mym = new myModel(); > String firstname = (String) daf.get("fname"); > String lastname = (String) daf.get("lname") ; > String street = (String)daf.get("street") ; > String city = (String)daf.get("city") ; > String state = (String)daf.get("state") ; > > myModel.doBusiness(firstname, lastname,street,city,state); > > > > > then in myModel: > > PreparedStatement pstmt = con.prepareStatement(qstr); > pstmt.setString(1,(String)daf.get("firstname")); > pstmt.setString(2,(String)daf.get("lastname")); > pstmt.setString(3,(String)daf.get("street")); > pstmt.setString(4, (String)daf.get("city")); > pstmt.setString(5, (String)daf.get("state")); > > > > // the New Way: the dark side > > now I can just do: > > myModel mym = new myModel(); > myModel.doBusiness(daf); > > > Yes, in myModel class I still have to break out daf.getXXX but at least > now all thefields can be managed from one place and less prone to > mismached case/spelling (for me anyway) than it was before. > > Of course I really do not want to violate the Struts MVC model, is there > a better way than the first method? > > Thanks All > > > -- > Vincent Stoessel > Linux Systems Developer > vincent xaymaca.com > > > -- > To unsubscribe, e-mail: <mailto:struts-user-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:struts-user-help@;jakarta.apache.org> -- To unsubscribe, e-mail: <mailto:struts-user-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:struts-user-help@;jakarta.apache.org>
