How to define a field which is accessible in every model?

Question

Generally in object programming there is something called as Global variables which can be accessed without any object and throughout the program. Now with respect to Odoo, i want to know how and where to define a field which then can be accessed in and from all the other modules.
I am thinking defining a field in base module does the thing but i'm not sure of it. Please answer, if anyone knows how to do this or can this even be done?

faOtools · Accepted Answer

Yes, you are right: fot that purpose you can apply the class 'BaseModel' from the Odoo core (the file 'models.py').
All other Odoo classes (sale.order, product.product, so any) inherit that class. For example, here the columns '_name', '_order', '_sequence' are defined.
You can define your own as well like _my_global_variable = 100. Then, you may use it in any class as self. _my_global_variable. Besides, you will be able to re-define it privately for a definite model.
In many cases, however, it

Silverstar · Answer

Hi,
you can check this class, you can define field over here, this can be accessible everywhere.
_inherit   =   'res.config.settings'
res [ field_name ]  =  self . env [ 'ir.config_parameter' ] . get_param ( key_name ,  '' )  Regards,
Silvestar

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