How to check for a float field and give a constraint for any action in Odoo v8

Question

Suppose, in a custom module, I have fields for:
product_id, stock_location, stock_move, etc
And on another custom module I have a Float field, which will have a quantity, it will represent a fiscal year.

So, before I do any movement, I should check for this Float field, and somehow compare it's data with the product, or products I will be moving (product have a field called 'sale_price' but it could be even a custom Float also on product)

I don't know if I'm explaining myself, but what I want

Avinash Nk · Accepted Answer

Hi kristian,
What I can understand from your question is, you have to compare the value of a field on your record with a field in another record.
for that, you can create any function.
for example, you can call the function on the onchange of your field.
Ex:

from openerp.exceptions import ValidationError @api.multi
@api.onchange('your_field')
def function_name(self):
model_of_the_needed_field = self.env['needed.model'].browse(needed_record_id)
#now you can compare the value of your field and th

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