#510: website: How Ruby Programmers Should Learn Cocoa
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Reporter: ernest.prabha...@… | Owner: lsansone...@…
Type: task | Status: new
Priority: minor | Milestone:
Component: MacRuby | Keywords:
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[From the mailing list - someone should add to the docs]
Brian Chapados wrote:
If MacRuby is your first exposure to mac programming and all of the
associated tools and techniques, starting out by jumping into an
IB-based project that uses CoreData & Bindings is going to be really
confusing.
I'd break up the tasks into pieces small enough that you can actually
understand what's going on. You shouldn't feel like things are
happening "magically". If that is the case, then try to take a step
back and figure out how the magic trick works.
For example, if you want to tackle CoreData first, then start with
just CoreData. Build a command-line program that creates a CoreData
stack by reading in your compiled .xcdatamodel (or create the model in
code!), add some data, and save it. Once you've got that working,
then make it download data from your web service and save it.
Here is the approach I would take:
1. If you haven't already, read through the Core Data Programming guide:
http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/CoreData/cdProgrammingGuide.html
At the very least, browse through this to get a feel for what's going
on. You won't understand everything, but at least you'll have some
sense of where to look when you get stuck.
2. Read the Core Data Utility tutorial:
http://developer.apple.com/mac/library/documentation/cocoa/conceptual/CoreDataUtilityTutorial/Articles/00_introduction.html
This gives you a basic Obj-C version of a program the uses CoreData
entirely through the API. Everything is done in code, even creating
the model, so it should get you started on something basic.
3. As it turns out, Matt Gallagher (cocoawithlove.com) recently posted
an excellent article on parsing CSV files and importing the data into
CoreData: http://cocoawithlove.com/2009/11/writing-parser-using-nsscanner-
csv.html
I highly recommend you also download and read through his code to see
how it works.
4. Use the code from #2 & #3 to write a minimal implementation in
MacRuby that imports data into your model.
5. After getting #4 to work, go back and read the section on
efficiently importing data in the CoreData programming guide and
refactor your import code appropriately.
At least this way, if you get stuck on #4 & #5, you'll have a fairly
short, self-contained example program that you can put in a gist, post
a link, and ask for help on specific parts.
_________________________________
And 6. Once you believe you understand how everything works, submit a
sample code to us! :-)
--
Ticket URL: <http://www.macruby.org/trac/ticket/510>
MacRuby <http://macruby.org/>
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