hi, i m read this documentation. and found the related field so i want to understand actually how to use related field in country->state->city example.
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I normally use related fields only if I need some value from a parent model (M2O) to use it a view. Like when using domain filters, making fields invisible/readonly, itd.. Else just use M2O fields. Even with related fields you need a M2O field to use it in relate.
For your example I think you can't the way you want. The res_country_state model has the country_id, so you could get the country name from the res_country_state model and not the other way around.
country_name = fields.Char(relate='country_id.name')
You do not need to create related field you just use many2one field to access it.
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you want to fetch country name from state->country?