I would like to start small discussion about some 'pattern' related with
management of data from database in
flex. All examples that I`ve found in the web shows only some simple cases,
and I haven`t found description of some complex problems.
So for this example, let`s suppose a very simple class model like this:
class Company {
var id:Number;
var name:String;
}
class Order {
var id:Number;
var order_items:Array;
var company:Company;
}
class OrderItem{
var id:Number;
var product:Product;
var number:Number;
}
class Product{
var id:Number;
var name:String;
}
So we will try tu build an application that will allow to browse throught
orders, and to add some new one.
Also we want to be able to add/modify/remove Company and Product
dictionary.
Let`s suppose that we will get data through AMF, and use Cairngorm.
First thing after application start will be sending a request to receive
all data from server
So we will send some requests like LIST_PRODUCTS, LIST_COMPANYS,
LIST_ORDERS
While the first two will send us back simple array of objects, the third
one should send array or <Order>
objects, with it`s related attributes 'included' - like array of
order_items, and related <Company> object.
order_items will be an array of <OrderItem> class, and each one will have
related <Product> class
Now we would like to make a window to add/modify order, where company will
be placed in ComboBox field.
Dataprovider for this ComboBox will be a <Company> objects array.
If we will simply try to assign its value to order.company value, it won`t
work because of course these are
different objects. That`s the firs problem.
Lets now suppose that we will modify some product in products array,
(change it`s name) and save it.
Of course products in order items won`t magically change, because they are
different objects and we need to do it our selfs.
So my main question is - How all this case should be realized. How should
we write some bigger application, that needs to 'recreate' some part of
RELATIONAL database in the client side.
I know that it can be done in many ways, but for example - sending data to
a client with foreign keys id`s ( company_id:Number) and then linking it
back at the server side is really primitive way.
How do you realize your`s application in a subject od relational data
management ?
Maybe some Adobe expert will write few words about 'How it should be done'
?
Best Regards
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