Am not sure whether I follow your requirement,

Incase if you are trying to execute a method before creating a Record, then use "default_get()" method, which will be first method to execute for every New record creation.

Or

If you are trying to execute method when everytime view is loaded, then ensure Compute field is not stored to the database, Which means odoo will compute the value for this field every time you load a view, as the data is not stored. However if the compute field is stored to database, then it will be triggered only at the time of creation or update/writing to that record

Or

If you are trying to execute method, at launch of Odoo server, then use "__init__()" method in your Object to perform your task.

I had the same problem as you

have you found a solution !!

Thank you for your answer
I'll try to precise it : I would like to generate a list of record (that doesn't exist in a first place) when the view is loaded.
So i created a method that calls create(vals) in a loop but i don't know how to call this method each time the view is loaded without calling it from an instance of the model.

Thank you again !