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Using the this scope is 'bad' practice only in terms of O-O. Have a look
at some decent descriptions of O-O, and in particular encapsulation
Heres one that relates to java (which implements O-O very well):
http://javaboutique.internet.com/articles/ITJ/part02/index.html
In other languages, the problem of returning multiple values is dealt
with in ways which CFCs cant handle (pointers). I would think the most
straight forward way to do it in CF is to return a STRUCT of all the
different return values. I think this is a more elegant solution as
there is one less line of code:
<cfset st_result = myObject.myMethod("argument")>
<cffif st_result.b_success>
<cfloop query="st_result.q_records">
<!--- etc. --->
</cfloop>
</cfif>
In the above example, the struct return contains two values, a success
or failure flag and the query.
In my opinion, objects and cfcs should be written so that the code that
uses them uses as little and as readable code as possible. The code
inside the objects can be as complex as you like as long as the
/interface/ that uses them is clean. The extra cfset line that accesses
the produced query seems a little ambiguous to me and would be harder to
document than a method that returns a structure that contains the query
and the other return variable.
My tuppence worth
Dom
Gary F wrote:
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I posted a similar message on Ray Camden's Ask a Jedi blog but it created
more questions than answers. I need to return at least 2 complex objects
(queries) from a CFC. The CFRETURN function only lets you return a single
object/variable so I started using the THIS scope.
Example: from within the CFC
<CFSET this.myquery=myquery>
Now myquery is exposed to the parent page so I can grab it like so:
<!--- use createobject to initiate the cfc --->
<CFSET objCFC=CreateObject("component","myCFC")>
<!--- collect a varible that CFReturn would usually return from a cfc --->
<CFSET getReturnedData=objCFC.myFunction("optional arguments go here")>
<!--- get the var/object that was explosed using the This scope --->
<CFSET myquery=objCFC.myquery>
I found this is the quickest and most effecient way to return multiple
vars/objects from CFCs without storing them in arrays or structures which
seems like a waste of code when This works with total simplicity. Someone
told me using the This scope is bad practice but failed to give a reason. I
honestly don't see what's wrong with this, but I'd like to hear the thoughts
of experienced CFC users? (I've only been using CFCs for a few months).
Thanks,
Gary.
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