Hi All,
#random_find_of_the_day
So I stumbled across something ... I didn't know you can
programmatically add/edit/remove attributes of properties defined in a
component? Not only that but the programmatically adjusted attributes
will persist for life of the application (not sure I understand why
that is [CF Admin setting?])!
Why is that useful? I don't know.
For example, take the classic component definition called person.cfc:
<cfcomponent>
<cfproperty name="FirstName">
<cfproperty name="LastName">
</cfcomponent>
See, two properties, one attribute per property, 'name'.
Then in a .cfm instantiate the object and get the metadata:
<cfset obj = CreateObject("component","person")>
<cfset metaData = GetMetaData(obj)>
<cfset arr = metaData.properties>
If you dump the #arr# you should see a 2 element array. Each element
should have a struct with the key 'NAME' and a value of 'FirstName'
for the first and 'LastName' for the second.
Add an extra attribute to the first property, by adding an extra
struct key to the first property:
<cfset arr[1]["WHY"] = "is this useful?">
Now create another .cfm where all you do is instantiate the object
again, get the metadata properties and dump the resulting array.
The struct in the first element of the array should now have two keys
'NAME' and 'WHY'.
Interestingly you can't add extra properties i.e. ArrayAppend()
<guess>maybe because it is a protected CF runtime data type; well that
is what the error suggests when I tried</guess>
Like I said, I've no idea why you'd do this or even if it is useful.
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