Remote Object: Do I have to call "read" every time I change data?
I have a dataset of about 500 records that I need to read
into a datagrid and be able to add, modify or delete. Using
remoteObject, I call a 'read' method which gets the data and
populates the datagrid. Reading the data alone takes about 6-8
seconds, which is acceptable when first opening the application.
However, to keep the data fresh after each addition or
modification, I have to re-read the data into an arrayCollection.
Is there any way to update only the record(s) that is
affected by the changes, so I don't have to keep reading the whole
table and refreshing the arrayCollection each time I make a
change?
Yes, this would be one option. When receiving the data from
your DB, you could save this data to your primary (display)
ArrayCollection and a copy (source.concat()) to a secondary
ArrayCollection. After modifying the items on your primary
ArrayCollection you could compare both Collections and generate a
third Collection containing only the changed objects. This third
collection would be the one you send back to be updated at your DB.
The second method, which i would particularly recommend is
saving each modification and just returning the modified object.
For instance, your Collection has 10 items and you are modifying
the 3rd item, id = 3. After editing this item you could save its
index (2) and your update method returns only the modified item
instead of a new list (select * from my_table where id = 3). Now
knowing its index (as var or AsynkToken property) you could easily
update/substitute this item on your collection.
Choosing between each option will depend only on what you
intend do do. You may also create some variations in order to get
more or less security while changing your data.
Regards,
Peter
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