I'm creating a module for student management in "Odoo9", in a part of that module I want to compute the average mark that a student get in a subject like "maths".I'm tryingto achieve that using this code, but I have a problem computing the "Avg-Maths" immediately after filling "Maths-1" and "Maths-2", it can only be computed after saving the student profile.Can someone help me please realizing the issue here? and how can I fix this?

[![enter image description here][1]][1]

[1]: http://i.stack.imgur.com/LIZOE.png

#student class

class student_student(models.Model):

'

'

'

result_ids = fields.One2many("schoolresults.detail", "student_id", "School Results")

'

'

'

class schoolresults_detail(models.Model):

_name = "schoolresults.detail"

_description = "Student's results."

student_id = fields.Many2one("student.student", "Student", ondelete="cascade")

subject_id = fields.Many2one("schoolresults.subject", "Subject")

result_manual = fields.Float("Result")

result = fields.Float(compute='_compute_value',store=True)

manual = fields.Boolean(compute='_is_manual', default=False)

@api.one

@api.depends('manual')

def _is_manual(self):

self.manual = self.subject_id.my_id

@api.one

@api.depends('result_manual','subject_id','subject_id.my_id')

def _compute_value(self):

self.ensure_one()

results = self.env['schoolresults.detail'].search([])

total = 0

for data in results:

total += data.result_manual

for data in results:

#if the subject is the average of others

if data.subject_id.my_id:

data.result = total

class schoolresults_subject(models.Model):

_name = "schoolresults.subject"

_description = "Student's subjects."

my_id = fields.Integer(default=0)

name = fields.Char("Subject")