On 4/19/06, Bryan Stevenson <[EMAIL PROTECTED]> wrote:
> With the exception of the "adding a new field in the DB and it's avaialable
> evrywhere" bit, the other examples are easily handles by CFCs....one method to
> update...another to insert...they do different things...just like your
> example:
First of all, you can write CFCs that reflect the database to
dynamically find out the content. So that's not all that amazing from
a CF perspective. Butyou're really missing a lot about what's going on
under the hood.
Here's an example of an ActiveRecord class that models an order
class Order < ActiveRecord::Base
end
That's it, two lines of code (hardly worth firing up the command line
to generate it...)
So what can I do now that I have those two lines? (This is
*completely* independent of Rails for what it's worth -- I can do this
from a Ruby command line since ActiveRecord is just another class. )
First of all, the class reflects the db to find all the columns and their types.
Now, some code
Order.find(10)
I just found order with the key=10. No code, no sql. That function is
built-in and knows what to do.
Though to be fair, I should add a few lines to initialize the db
connection, which would be taken care of in the Rails environment.
Now all the orders that are from virginia and a few variations
Order.find(:all, :conditions => "state='va'")
Order.find(:all, :conditions => "state='va', and firstname='bob'")
Order.find(:all, :conditions => "state='va' and total>1000")
of course all the quoting, escaping, and sql-injection is handled for
you. And it's easy to paramaterize to the params[] hash (similar to
attributes scope in cf) if you're in Rails.
Order.find(:all, :conditions => [state = :state and total > :total",params)
Remember our class that provides this looks like this
class Order < ActiveRecord::Base
end
I could also do this
Order.find_by_state("Virginia")
Note that I'm not adding that method to the code. It just gets figured
out. I can do this too
Order.find_by_state_and_firstname("Virginia","Bob")
Still, by ActiveRecord class is two lines of boilerplate. And we
haven't gotten to the CUD parts of CRUD yet. Or the C and V parts of
MVC. Or testing/etc.
What does the equivalent CFC look like?
I do know Arf! can do a little of this, and that Reactor will generate
some of this as well. And most of this _could_ be duplicated with a
lot of hard work in CF.
Of course I *do* still have to write the date range validation by hand :)
> Same goes for validation on Insert/update...seperate methods to handle
> them....so no bonus with RoRo there.
Except that you *don't have to write the methods* in most cases, or at
least you write very little.
> Now the "add a field" bit you mentioned....well just because "everything"
> knows
> about the new field does NOT mean that "everything" knows what to do with
> it.....so back to having to add custom code tweaks to make "everything" handle
> that new field correctly.
Sure it does. You can CRUD it. All of the objects (even aggregate
objects) automatically know what to do with it. Etc, etc.
> No sale here....try the Vogons..they're big on super highways...mabye they'll
> see the light that I cannot ;-)
That's fine -- you don't have to use Rails. But I think you're
discounting it without knowing a whole lot about what it really does
-- watching the "Rails in 15m" intro doesn't give you much to go on
compared to working throught the Rails book (Agile Web Dev w/ Rails)
or building a couple of real apps.
Heck, I'm annoyed that I have to write XML to configure all the CF
frameworks after I come back from a week or two in YAML land.. but
that's a completely different thread ;)
--
John Paul Ashenfelter
CTO/Transitionpoint
(blog) http://www.ashenfelter.com
(email) [EMAIL PROTECTED]
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