CFML - Array and Scope - Object of type class coldfusion.runtime.Struct cannot be used as an array

Question

I would like to use scopes for my array variable names.

This example works.

<cfset person_first_name[1] = "John">
<cfset person_first_name[2] = "Jack">
<cfset x = ArrayLen(person_first_name)>

However, this code occures the following error: "Object of type class coldfusion.runtime.Struct cannot be used as an array"

<cfset person.first_name[1] = "John">
<cfset person.first_name[2] = "Jack">
<cfset x = ArrayLen(person.first_name)>

Isn't it possible to name the variables like that?

What version of CF? I recall some instances of CF treating complex variable declatations like that as structures, not arrays. Explicitly declaring the subkey, person.first_name as an array first got around the issue. I.e. person.first_name = [], then appending values to it, or initializing it in one line like person.first_name = ["John","Jack"] — SOS
– SOS, Commented Mar 12, 2021 at 15:04
I use CF2018. The declaration works, the error doesnt occure anymore. Thanks for that hint. There are a lot more variables like id, last_name or dob. I get the data from a query and fill the array during the loop. — Christian
– Christian, Commented Mar 12, 2021 at 15:17
Not sure what the code is doing, but might consider leaving it as a query or using an array of structures instead, which is a lot more intuitive imo :) Like personArray[1] = { first_name = "...", dob = "..."}, etc... — SOS
– SOS, Commented Mar 12, 2021 at 15:19
My intention is to separate data processing and output from each other and to make my code, file and directory structure cleaner and more comprehensible. I prefer the spelling with a dot. On the left is the type of data and on the right of the dot what information it is. The arrays are filled in a loop over the query result. For output, I loop over the array and access the individual data via the index: <cfloop array="#person.id#" index="i">#person.id[i]# #person.first_name[i]# #person.last_name[i]#<br></cfloop>. — Christian
– Christian, Commented Mar 12, 2021 at 16:00
And there is another aspect. To generate less code I would like to use the same code or the same functions for selecting and outputting a single data record (e.g. for a form) or for a list. A single data record is then an array with only one element. — Christian
– Christian, Commented Mar 12, 2021 at 16:04

Christian · Accepted Answer · 2021-03-12 16:21:07Z

3

Adding a declaration for the array solved the problem. Thanks @SOS.

<cfset person.first_name = []>

answered Mar 12, 2021 at 16:21

Christian

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