Hi,
when working with data from a relational database is really common to
have a column that refer to the primary key of another table (a
foreign key). Suppose, for example, to model a bug tracking system. We
can have a task that refer a state:
var states = [
{ id: 1, name: "Open" },
{ id: 2, name: "Closed" },
];
var task = {
id: 1,
description: "my first issue",
stateId: 2
};
to bind a task object structure to the UI we have to create a
SelectBox that holds all states objects, showing "name" field and
using "id" field as model. We can then bidirectionally bind the
selection in SelectBox to "task.stateId". To accomplish this task we
have to customize the controller for the SelectBox in this way:
var stateComboBox = new qx.ui.form.SelectBox();
var statesController = new qx.data.controller.List(null, stateComboBox);
statesController.setDelegate({
bindItem: function(controller, item, index) {
controller.bindProperty("id", "model", null, item, index);
controller.bindProperty("name", "label",
controller.getLabelOptions(), item, index);
}
});
And this works well. So the question is:
Given that this use case is common, why not adding another optional
"modelPath" parameter to the constructror, to avoid using
IControllerDelegate? The previous code will then become:
var stateComboBox = new qx.ui.form.SelectBox();
var statesController = new qx.data.controller.List(null,
stateComboBox, "name", "id");
Looking at qx.data.controller.List implementation, this should be a
trivial and non invasive feature. I can also try to prepare a patch
for this.
Gian Marco Gherardi
http://gianmarco.gherardi.me
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