Is it possible to check if the previous version is: "Less than" a certain value using the context.previousVersion() field.

The documentation does a one-to-one comparison for a specific version like so:

if(context.previousVersion().compareTo(new Version(1,0)) == 0)

So could I check for versions less than 1.0?

Attribution to: jordan.baucke

Possible Suggestion/Solution #1

You can also use major() and minor() methods in the Version object to get each part of the version number:

The version number has the format majorNumber.minorNumber.patchNumber (for example, 1.2.0)

if ((context.previousVersion().major() == 1) 
     && (context.previousVersion().minor() > 0)
     && (System.requestVersion().minor() <=9))
{
    // Do something for versions  between 1.1 and 1.9
}
else if (context.previousVersion().compareTo(new Version(2,0)) >= 0)
{
    // Do something completely different for versions 2.0 or greater
}

Source: Salesforce Version Class

Attribution to: flor

Possible Suggestion/Solution #2

I'm not sure about the PostInstall context, but looking at the documentation for Version.compareTo() I'd say it was possible.

Try something like:

if(context.previousVersion().compareTo(new Version(1,0)) < 0) {
    // Previous Version is Less than Version 1.0 code
}

---

Updated docs:

Return Value
Type: Integer
Returns one of the following values:

• zero if the current package version is equal to the specified package version
• an Integer value greater than zero if the current package version is greater than the specified package version
• an Integer value less than zero if the current package version is less than the specified package version

Attribution to: Daniel Ballinger
This content is remixed from stackoverflow or stackexchange. Please visit https://salesforce.stackexchange.com/questions/5100