Local machine environment variable - postman

Question

I have next problem: I have same environment for site on work and home PC, but I have different database records inside it.
So in that case for test requests on my local environment I constantly need to change tested values.
Postman has different scopes for variables (see documentation)
In my case in collection scope is saved production variables. On environment scope I rewrite this values by my local configuration.
Collection variables
SITE_DOMAIN - https://www.prod.com/
USER_ID - 1234567890
Environment variable
SITE_DOMAIN - https://dev.loc/
USER_ID - 123
At home I have the same domain, but another user id and I need to change it in Environment variable every time when I wanna run request at home.
I wanna setup USER_ID to another value only at home local machine.
Recorded interface example
Is it possible to rewrite variable with local machine scope? There is local layer, but it isn't described in documentation.

Answer 1

If I understand the question correctly:
You could add a value into the local environment file local_dev or something, to run a check to see if it’s there - then have some logic in the pre-request script that looks for the value, if it exists, then change the USER_ID variable to the one you want before the request is made and if not, do nothing.
Roughly, something kind of like this but more elegant:
if(pm.environment.get('local_dev') === 'some_value') {
pm.environment.set('USER_ID', 1234)
}
I might have totally misunderstood the question though.

Answer 2

As I see, local variable is that variable which we setup in Pre-request Script section in pm.variables scope.
So we can override environment value without changing it by
pm.variables.set("VAR_NAME", "VAR_VALUE");
Unfortunately it will run in all PC's on each send request. So we need to add some logic to it.
As it supposed by #Danny Dainton we can add some environment variable for dev PC position.
So as a workaround I add variable PC_ENV to Local environment and put some logic for this in Pre-request Script section.
if (pm.environment.get('PC_ENV') === 'home') {
pm.variables.set("USER_ID", "35");
}
How can we use this? When we start work with Postman we go to our environment and setup PC_ENV value to home or office depends on where we are now.
Recorded example
If we don't want to run Pre-script section every time we can add all local variables values for each PC and run it only once at the beginning of the work by setup required condition.
const needSetupEnvironment = true;//change to false when setup is finished
if (needSetupEnvironment) {
const currentEnvironment = 'home';//setup environment before start work
let userId;
switch (currentEnvironment) {
case 'home':
userId = 35;
break;
default:
userId = 123;
break;
}
pm.environment.set('USER_ID', userId);
}
We can enable script when we need to change environment variables, and than disable it after setup run it once with correct environment.
Recorded example