over riding the var defined in include var file is making all other variables undefined

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1

I have included var file using
var_files:

  • file

It has a variable city. state among others

Then I redefine the city variable in a json file and run the playbook --extra-vars “@a.json”

Now when I access any variable other then city it gives undefined var.

2

Should I over-ride all variables? Looks like that.

Or can I selectively decide to over ride only few of them. This is what I want.