Construct array with object reference

Not sure if I'm phrasing this correctly, but I have the following test code:

TestVariable = 123

TestObject = 
{
  ['VarToChange'] = TestVariable,
  ['SomethingStatic'] = 789
}

print (TestObject.VarToChange)

TestVariable = 456

print (TestObject.VarToChange)

The output of which is:

123
123

I was expecting that changing the TestVariable value that it would also update the array, but that does not appear to be the case. In other words, I was expecting the output to be this:

123
456

Is there a way to accomplish this in lua? How can that be done?

Solution

You are not updating your table. but a variable, as far as the table is concerned that variable no longer exist where you are trying to modify it. what would work is

TestObject.VarToChange = TestVariable

so to rewrite you should test the following

TestVariable = 123

TestObject = 
{
  ['VarToChange'] = TestVariable,
  ['SomethingStatic'] = 789
}

print (TestObject.VarToChange)

TestVariable = 456
TestObject.VarToChange = TestVariable 
print (TestObject.VarToChange)

To use metamethod to achieve this based on your follow up comment.
Note: Code can be improved to be cleaner.

TestVariable = 123

TestObject = 
{
  ['VarToChange'] = TestVariable,
  ['SomethingStatic'] = 789
}
local metatable = {
  __index = function(table, key)
    if key == "VarToChange"  then
      data.VarToChange = data.VarToChange
    end
    return data[key]
  end,

  __newindex = function(table, key, value)
    data[key] = value
    if key == "VarToChange" then
      data.VarToChange = data.VarToChange
    end
  end
}

setmetatable(TestObject, metatable)



print(TestObject.VarToChange)


TestObject.VarToChange = 456
print(TestObject.VarToChange)