How to update only one field of one2many field in odoo8?

Question

I have already added some values in one2many field and on button click i want to update only one field value. How can i do that?
For example :
my one2many field stud_details  have values:
Roll No
Name
Mark
1
abc

2
pqr
Here rollno , name are already added and on Clicking BUTTon "UPDATE" the marks field need to get updated..
I need to add the same mark for all the students..
for say, for taking marks values having one integer field called Mark_update field, and on clicking the button "UPDATE" the

Deepak · Accepted Answer

You can Use write() method for updating the one2many field.
For example :
Here below is the code , here we can write mark for each record in one2many field.
for record in  self .browse(cr , uid , ids , context =context):
for order in record.stud_details:
order.write({ 'mark' : record.mark_update})
return

Arunkumar · Answer

You click the one2many field  and add Mark field then save

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