[Magritte] MAToOneRelationDescription explanation

> Hello German,
> On Sun, Jan 31, 2010 at 8:42 AM, Germán Arduino <[hidden email]> 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.
>> --
>> =================================================
>> Germán S. Arduino  <gsa @ arsol.net>   Twitter: garduino
>> Arduino Software & Web Hosting   http://www.arduinosoftware.com
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>> =================================================
>>
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