[fpc-pascal] How to make class constructor body calls descendant's overriden method/property?
jcmoraisjr at gmail.com
Sat Nov 17 22:40:13 CET 2012
On Sat, Nov 17, 2012 at 12:48 PM, leledumbo <leledumbo_cool at yahoo.co.id> wrote:
> Cross posted from stackoverflow:
> I'm writing an ORM framework and got stuck in a way to automatically
> determine table name from class name. In my base object for the ORM to work,
> I have:
> TghModel = class
> class var FTableName: String;
> class constructor Create;
> whose implementation is:
> class constructor TghModel.Create;
> FTableName := ClassName;
> Delete(FTableName,1,1); // Delete 'T'
> My assumption was that ClassName method will return the real class name.
> e.g. if I have:
> TUsers = class(TghModel)
> then FTableName will be initialized to TUsers instead of TghModel, which is
> wrong. I want to avoid users to make class constructor for each classes
> inheriting from TghModel, especially because the content would be totally
> the same as in TghModel.Create. Is there any way to implement it?
Tell the user of the framework to do something like this for every
class of your model:
RegisterClasses([TUser, TProduct, ...]);
Btw I've tried the following code:
TBase = class(TObject)
class var name: string;
TConcrete = class(TBase);
TBase.name := 'base';
TConcrete.name := 'concrete';
writeln('TBase.name: ', TBase.name);
whose output is:
which means, if I'm not mistaken, the class var "name" is shared
between all decendants, so perhaps your approach won't work very well.
Please correct me if I'm wrong.
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