Ask-a-Muse: Using Implicit Constructors
Muse Reader Howard Asks:
I'm trying to implement the Impel HTML5 ORM on the front-end of a CF powered app. The Impel docs have an example of a PHP JSON web service that is used to return some table version information. They say that the service should return an "array of objects, but I'm a bit stumped as to how their PHP snippet would translate to CF. Could this be a struct? Here's the snippet,
<?php echo $callback?>([{ "table" : "card", "version" : 1},
{ "table" : "stack", "version" : 1},
{ "table" : "similar_card","version" : 1},
{ "table" : "card_score", "version" : 1} ]);
?>
While I'm not certain I have enough information be sure I'm answering your question, I can tell you that implementing an array of objects is pretty easy if you are using ColdFusion 8. Check this out:
<cfset callback[1] = {table = "card", version = 1}/>
<cfset callback[2] = {table = "stack", version = 1}/>
<cfset callback[3] = {table = "similar_card", version = 1}/>
<cfset callback[4] = {table = "card_score", version = 1}/>
<cfdump var="#callback#"/>
Howard, you sound like you already know a good bit of this, but for the rest of you out there I believe this is usually refered to as an "implicit" object constuctor - meaning the type of object created is assumed due to the way the values are arranged in the code. It is a common feature of most languages - including PHP. It is something of a late comer to ColdFusion, but better late than never. Rather than bore you with my own inimitable style I will refer you to the excellent writing and analysis of ColdFusion Guru and all around smarty pants Ben Nadel. See his post on Implicit Struct and Array Creation.
3 Comments
-
Wouldn't the CF equivalent would be what's below? The PHP code is outputting JSON/JSONP.
<cfparam name="callback" default="callback" >
<cfoutput>#callback#</cfoutput>([{ "table" : "card", "version" : 1},
{ "table" : "stack", "version" : 1},
{ "table" : "similar_card","version" : 1},
{ "table" : "card_score", "version" : 1} ]);
Or if you're on CF8 and you already have a native CF data structure that you want to convert to JSON you could potentially do something like:
<cfparam name="callback" default="callback" >
<cfoutput>
#callback#(#SerializeJSON(myNativeCFDataStructure)#);
</cfoutput>
He really needs to get familiar with JSON not implicit structure / array creation.
Article on JSONP
http://www.coldfusionjedi.com/index.cfm/2009/5/7/U...
Info on JSON
http://en.wikipedia.org/wiki/JSON -
@Kurt,
Thanks for the excellent comment. I hope he finds it helpful. And in the words of Dan Quayle "I stand by all my misstatements" :) -
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