On Sun, Jan 31, 2010 at 8:42 AM, Germán Arduino <garduino@gmail.com> wrote:

Hi:

I'm a bit confused using relationships between objects in Magritte.
Let's start with MAToOneRelationDescription.

I've a Contracts system were each contract have 1:1 Relation with
Suppliers (another collection of the system), then on the form
to add contracts, on the place of Supplier I wants to show a combo
with, for example, all the suppliers names loaded on the
suppliers collection, to select one to use in the current contract.
Very common need I think (Is the way I used to do with Mewa).

But trying with different options (not found much doc about each
possible method to use on MAToOneRelationDescription) I get
a "create" button than, certainly, is not what I need and really not
understand the fundamentals of this button on a single 1:1
relationship.

On the class side of MAToOneRelationDescription the defaultComponentClasses method returns an array with two component classes: MAExternalEditorComponent and MAInternalEditorComponent. By default, the first of these is what you are seeing rendered. To override this behavior you have to send componentClass: to your description. Magritte does not come with a select list component for the MAToOneRelationDescription but it is easy to create one descended from MAOneToOneComponent that will render a select list of all the instances of the classes declared in the classes: message sent to the description. So your descriptionSupplier method might look like:

^MAToOneRelationDescription new

classes: (Array with: Supplier);

componentClass: NewSelectionComponent;

accessor: #supplier;

&etc

I threw one together and attached the FileOut of it. It is descended from the ExternalEditor component so it renders a Create button as well.

One caveat, I am using Seaside 2.8

Hope this helps

John

Any clarification about this topic, examples, documentation, etc will
be greatly appreciated.

BTW, I'm using Seaside 3.0 with installed on Pharo rc2 with the
Configuration provided by Dale.

Cheers.
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Germán S. Arduino <gsa @ arsol.net> Twitter: garduino
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